Best Gear Ratio For Th400

I say this because what was considered wide ratio in the 1960's is considered close ratio today. Gear ratio is calculated by dividing the number of teeth on the ring gear by the number of teeth on the pinion gear. TH350 or TH400 for towing a BP travel trailer Not giant numbers, but it tows our 2 horse trailer loaded with 2 hay burners without any problems. Again its up to the individual, im not knocking they just aren't for me. 48 for 2nd, and 1. There are two main AMC wide ratio boxes, 2. The 4L80-E uses 2 shift solenoids, initially called Shift Solenoid A & Shift Solenoid B, later changed to comply with OBD II (On Board Diagnostics revision 2) regulations to 1-2 Shift Solenoid & 2-3 Shift solenoid. These two bellhousing when measured from the lower two bolts are 13. A Sample of Top Rated Reels. If installing a 1+2 in your present TH400 and leaving in 2nd gear you can manually shift the transmission if desired as it'll be in the 4 second range after launch. But to tow with I would go with an even lower gear ratio to help. I was trusting what Ernie said when he inspected it so we installed the tranny on my 67 Camaro. This is a discussion on Are gear ratio's fixed when building 4l60e or 4l80e within the Automatic Transmission forums, part of the Drivetrain category; Can someone educate me on the internals of automatic transmissions. Decoding Chevrolet VIN, trim tags, cowl tags, engine, engine block casting numbers, cylinder head casting numbers, intake manifold casting numbers, transmission, interior codes, and paint codes. How to Easily Find Rear End Gear Ratios - Duration: 7:05 Driving th400 / 3800 stall and 3. Bottom line: Can you mate a TH400 behind an Oldsmobile 394? Yes! Is it a good upgrade to make? Sure, although I would still lean toward adding overdrive as well. The best way to determine what gear ratio you need is to determine how you'll be driving the car. 90 The aftermarket's premier 6-speed performance manual transmission 700 lb-ft. 8 has a 4:10 gear with a 27" tire. The reverse gear has a gear ratio of 2. The 350 has a lower first gear, which would be better for getting started. All others are 1. trans type. Anyone have any idea what kind of mileage difference there would be? Would it be worth it? I am assuming at 60 mph on the highway. Crawl ratios in the 60's are quite capable; in the 80's, very respectable, in the 110's, impressive and anything beyond the 130's is usually considered the point of diminishing returns. 70 you might want to buy the overdrive because of the more aggressive 3. The formula may also be simplified into this format: Speedometer Gear Teeth = (Drive Teeth * Rear End Ratio * 20. 00:1 First gear, an NP203 with 2. 08 axle gears. If this makes sense to you, take a look at our 4L80E options below. 88s on 28 tire trapping 98 mph at about 6-6300 rpm recently tubbed car and running a 33 tire now would like to keep revs under 7000 since I'm just bracket. What gear ratio would you run? I had a friend who drag raced a '76 T/A with a 455/TH400, and he made his best times with a 3. The results will then be: Automatic transmission in Drive; Automatic transmission in Overdrive. 48:1 First gear. Are they really this high geared? I'm thinkin if this is true I'd like to have maybe a 3:08. This chart has been revised with actual ratios. The ratio is calculated by multiplying your transmission, transfer case, and ring and pinion gear ratios. by Michael Dickens The New Venture Gear 3500, a medium duty five-speed overdrive manual transmission manufactured by New Venture Gear, was used in General Motors and Dodge compact and full-size light trucks. The military K5's feel doggy because of the high 2. 7L 153-Tooth 1-Piece Rear Main Seal External Engine Balance Flexplate. 73 gear ratio $300 or best offer. 0 for 3rd gear. The formula may also be simplified into this format: Speedometer Gear Teeth = (Drive Teeth * Rear End Ratio * 20. Drag Max RPM slider to adjust the range of the RPM and KPH Gauges. He'll advise you on the most appropriate ratio and build it if necessary. TCI SUPER STREETFIGHTER TH400 TRANSMISSION 4" TAILSHAFT CHEV SB/BB TCI211005 TheSuper StreetFighter™ Transmissions bridge the gap between the StreetFighter® series and full competition transmissions. New Process Gear NP435 - 4-speed longitudinal transmission used in a select handful of 67-72 GM pickups. Now available with the award winning ATI T400 SFI Certified SuperCase. First off, most GM overdrives have a Fourth gear ratio of 0. Just tell him what you want to accomplish. Save yourself the headache and let us figure out your ring-and-pinion gear ratio! Select the value you want to solve for. 6:1 take off gear. It is highly regarded for its supreme durability. The adapter material is 356 T-6 heat treated aluminum alloy and the adapter has a provision for a transmission. Not only is the 700R4 a more durable model, designed for heavy duty usage, but it also provides better gas mileage from the stronger overdrive, and a lower gear ratio by a factor of 20% than what. Gear Ratios - 1. TCI TH400 B. I would say the best option is run the car first so we can kinda figure out the power your making, and then it would be easy to figure out the gear ratio you need with your current setup. Speedo Gear Calculator. This page is all about what I learned after I decided to swap the original TH400 transmission in my 1975 GMC Suburban for a TH700R4 transmission to gain the benefits of a modern overdrive transmission and help tame my "great for towing" 4. and weighing up to 4000 lbs. That only gives you a 7. The ratio is calculated by multiplying your transmission, transfer case, and ring and pinion gear ratios. 00:1; Reverse - 2. This extremely stout gear set features new E9310 gears (eight pieces), a new forged ring gear a new forged planetary housing, 9310 pins, and new washers and needle. It was the first year for catalytic converters as well as the first year for HEI (high energy ignition). By modern, really that means anything computer controlled. I drive this car to FGMCC meets so the 3. I asked what gear ratio my truck had. Transmission Ratio RPM. 56 and the best thing I can say about it is that it makes a good low rpm cruiser, even with 245/60s. * SuperLight with transbrake any gear ratio John makes, $4,995. Both have an automatic 6 speed transmission, but one has the 3. Effective & Equivalent Gear Ratios Based On New and Old Tire Heights & Original Gear Enter the New Tire Height, Old Tire Height, & Original Rear Gear Ratio, Then Press 'Enter' Key Effective Ratio = (Old tire height / New tire height) * Original ratio. This calculator is useful for planning your rig, allowing you to see what kind of performance to expect from different combinations. 23 because it is harder to get the car going with the 3. the same percentage as your tire height increase. Before going into detail, there are several terms that need to be understood with regard to shift patterns and the TH400. Use our Differential Gear Ratio Calculator page to determine the best ring and pinion gear ratio for your vehicle. For best drag strip results use a converter that stalls close to peak torque. Rock bouncer. the car will be driven in town 90% and raced at track 10%, fuel economy is not a concern. The transmission output shaft fits directly. Gear Ratios are: First Gear - 2. 10 rear axle results in a final drive ratio of 10. A change in gear ratio equal to our example represents a 150 rpm difference at 6,000 rpm. com FREE DELIVERY possible on eligible purchases. Scroll through the list of popular transmissions to find yours. Pick up trucks tend to lack traction at the best of times, so you will spin the rear tires in first gear, regardless of the rear end ratio. We took my car for a test drive but the transmission would not shift out of first gear. Transmissions. Your lowest gear would be 6x3x4 = 72:1 and you’d have a total of 8 gears (4 high-range and 4 low-range). There are many differences between the TH350 and 700R4 transmissions. Although some transmission installers feel that the low first-gear ratio and high second-gear ratio do not make the TH700R-4 the best racing transmission, there are quite a few adaptations you can perform to make it a race-ready drivetrain component. 11, can this be confirmed? My van sounds as if it is in need of another gear when cruising on the open road in fifth, i would like to know the best gear diff ratio or better diff that would fit with out modifications 1995 3L V6 Ford Courier short wheel. 48:1, 3rd 1:1. Shifting at 5000rpm from 3rd gear into 4th (76mph), sees engine speed drop by almost 1500rpm, to a little over 3500rpm. For example, a vehicle with a 4. i never ran o/d on the 4r70 just so i wouldn't fry the bands if i nailed it and forgot wasnt bad around town on high way i just stayed. 13s, front end moving faster), or the back end pushing you up an obstacle (shorter gear ratio in the front, ie. I currently have a Gear Vendors overdrive in my big block powered Suburban which I use for towing. This page is all about what I learned after I decided to swap the original TH400 transmission in my 1975 GMC Suburban for a TH700R4 transmission to gain the benefits of a modern overdrive transmission and help tame my "great for towing" 4. CT8344 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 34 tooth driven Turbo 400 Speedometer Housing, Gears, Seals, Retainer, Bracket Questions?? We can help calibrate what gears you need to work with this speedo housing! A new. 73s aren't the best for the highway use. 65 planetaries for great run after run with minimum downtime. We just want to be sure you get the strongest option available at the best price the first time. 7 ratio as above a t400 will be revving at 3262rpm. Installation of the correct ring and pinion gear ratio will help optimize performance, fuel economy and overall driveability. These transmissions mate a three-element turbine torque converter to a Simpson planetary geartrain, providing three forward speeds plus reverse. The Novak Guide to the GM 4L80E Automatic Transmission Introduction. 06) belongs to the GM 4L60/E family of transmissions. 56 and the best thing I can say about it is that it makes a good low rpm cruiser, even with 245/60s. TH400: The Turbo 400, aka TH400, automatic transmission is a stout 3 speed automatic transmission. 84 Ratio 1st Gear Racing Transmission 1100+ HP !. 2004R has a better gear ratio spread, better Overdrive ratio, will fit many more applications, Lighter, Stronger I can go on and on. 88 ratio there are a few options. TCI TH400 B. Your car cant top out the final gear with 273's anyway. That data consists of the ring gear and pinion gear ratio, the height of the tires (diameter from ground to top of the tire while mounted on the vehicle) and the transmission final gear ratio. A good way to calculate this is to multiply. That's why new cars are generally coming with 6 speeds and up: the new Corvette C7 is 8 speeds, for example. ATI has T400 street rod and drag race transmssions for vehicles making 600 horsepower to 3,000 horsepower!. 00 for third, and 0. TH400 Protorque 'Pro Drive' Series converter. The gear ratios are 2. anyways, i was wondering, with a 383 stroker engine, what would be an ideal gear ratio for the rear end matched with an m-22? i would like to be able to use alot of the torque that the engine provides. Gear Ratios - 1. We prefer you call in before ordering so that we can help you select the transmission that best meets your needs. For best drag strip results use a converter that stalls close to peak torque. One of the planetary gearsets from our transmission has a ring gear with 72 teeth and a sun gear with 30 teeth. Transmission Gear Ratio Equation and Calculator Mechanics and Machines Calculations Menu The following equations and calculators will estimate the resultant vehicle speed at a known engine rpm for a manual transmission with up to six forward gears. i had a 350 with a muncie 4 speed and with 411s and as soon as that goes i am going with a 373 ratio, with my current setup its all low end i can cruz on the highway in 4 doing 60 and its at like 5500 rpm, thats why i plan on a 373, can the guy tell you why it wont work, i love when people tell you what wont work but cant explain why, if. Are gear ratio's fixed when building 4l60e or 4l80e. This is a massive tranny, and will probably handle whatever a Jag V12 can be made to dish out. 5" headers and cold air induction. More power generally means less gear and less power generally means more gear if your car has the rpm potential to use it. The adapter kit includes a adapter housing, NP205 input gear with 32 internal spline, soft plug, new input bearing, snap ring, seal, gaskets, fastening hardware and. The 1971 Monte SS (stock 454) currently has a TH400 trans and 3. Advance Adapters Atlas 4 Speed Transfer cases are built upon the industry leading Atlas 2 speed case with well over 10,000 units sold and are designed specifically for rock crawlers that need incredibly low gear ratios for slow speed technical driving. • New intermediate roller clutch. would be. 06 ratio (first) to 1. 52 which isn't bad I guess. 73 would be better. What would you chose and why?. ratio change free John Kilgore is a pioneering expert at creating custom ratios. 6L Duramax in GMC and Chevrolet pickups since 2001. 48 for 2nd, and 1. Maybe the following example will help you make sense of this. More power generally means less gear and less power generally means more gear if your car has the rpm potential to use it. 48:1; Third Gear - 1. They are available with four different gear ratio combinations with low range options down to. 3 overdrive to 4. The Magnum Box is a planetary gear reduction box that bolts to the front of an NP205 transfer case. Th700r4 is a 4 speed with a 4th gear ratio of I think. tire width. I get 31 mpg at 55 mph, but have a really poor gear ratio. TH350 -- 35hp 700r4 -- 70hp 727 -- 40hp 904 -- 35hp E4OD -- 65hp If you have corrections, or gear ratios for other rear-wheel drive transmissions, please e-mail me with the info. The electric kick down is much easier to set up, espescially if you are doing an LS Swap, They do both have an aluminum case, and three forward gears. i'm just looking for gear that will run me. 059:1 while the 4L80e have the gear ratio of 2. Planetary gear ratio calculations. 7L 168-Tooth 1-Piece Rear Main Seal External Engine Balance Flexplate; TCI Chevrolet 5. I would say the best option is run the car first so we can kinda figure out the power your making, and then it would be easy to figure out the gear ratio you need with your current setup. 74 6th gear -. A new wide-ratio gearset is installed. With a TH350 or a TH400, your car. In addition to a rebuilt unit NP205 transfer cases with a 12 month warranty we offer all parts required to rebuild your unit, we have new part and we can provide good used takeout. Diff ratio is 3. This is a discussion on Are gear ratio's fixed when building 4l60e or 4l80e within the Automatic Transmission forums, part of the Drivetrain category; Can someone educate me on the internals of automatic transmissions. The following information is not set in stone. 48 for 1st, 1. My goal is highway racing frequently and 1/4mile racing somtimes,the 4l80e kit is my best choice?. 96:1 ratio reduction in low and 1:1 in high range, and a manual shift. Simple guide to choosing the best diff gear ratios for your Jeep or 4x4 truck The correct chart for your gear ratio is important for drivability and economy. The results will then be: Automatic transmission in Drive; Automatic transmission in Overdrive. This will help you pick the right size tires, transmission and gear ratio combination for your classic. Transfer Case Info. The TH350 uses a mechanical kick down switch, whereas the TH400 uses an electric one. I would hit Overdrive once first gear is about over or second gear. Gear selection is #1 when it comes to building a vehicle that can conquer all types of situations and terrain. At the bottom of the speedometer face, look for the numbers 940, 960, 1000, or 1020. This form allows you to calculate final drive ratios as well as see a comparison of speeds and RPMs within operating ranges of the vehicle. When you increase the tire size without changing the gear ratio you increase fuel consumption and you can not drive at the low speeds needed for the off roads. This page is all about what I learned after I decided to swap the original TH400 transmission in my 1975 GMC Suburban for a TH700R4 transmission to gain the benefits of a modern overdrive transmission and help tame my "great for towing" 4. Buick called this transmission a Super Turbine 400 from 1964-68. But if my short stroke 327 is OK with this taller gear, those of you with a mild-mid performance 350 should have nothing to fear about using a 3. rockwell axles 6. 5" headers and cold air induction. The ring gear; Each of these three components can be the input, the output or can be held stationary. Inside Turbo 400 Planetaries With Coan Engineering. FTI® TH400-2 - Level 2 Perfromance Automatic Gear Ratio Calculator FTI builds some of the world’s best racing transmissions and related components. This adapter spacer when used with a 6" tailhousing 2WD TH350 (15. This information can then be used to compare different tire and wheel combinations to tranmission gears and differentials. cams pro magnum roller rockers (1. 0’s and 6000 rpm at the line. 4x4, 6 cyl, 4 wheel ABS, 4. This transmission was very popular and considered one of the best of ever produced. If your not running a V8 or built 6 cylinder 3. Gear Ratio and Tire Size Calculator - 4x4 and Jeep Ring & Pinion When you change your tire size you need to make sure you have the right gearing to get optimal fuel economy and power. I would say the best option is run the car first so we can kinda figure out the power your making, and then it would be easy to figure out the gear ratio you need with your current setup. Although the gear ratios are nominally different. The steepest first gear ratio of any four-speed automatic (3. GM TH400 Automatic Transmission. Installation of the correct ring and pinion gear ratio will help optimize performance, fuel economy and overall driveability. 5:1 compression, a Comp 292 cam (rough idling hot rod style cam), 4. The 4L80-E uses 2 shift solenoids, initially called Shift Solenoid A & Shift Solenoid B, later changed to comply with OBD II (On Board Diagnostics revision 2) regulations to 1-2 Shift Solenoid & 2-3 Shift solenoid. 1975 was the last year for a convertible until 1986. The TH-700R-4 uses less than 1/3 of the horse power of the best TH-400 build, and according to the GM usage charts, the TH-700R-4 is only VERY SLIGHTLY less strong than the TH-400. 7 underdrive. This is 21% lower than the first gear ratio in a TH-350 ( 2. Effective & Equivalent Gear Ratios Based On New and Old Tire Heights & Original Gear Enter the New Tire Height, Old Tire Height, & Original Rear Gear Ratio, Then Press 'Enter' Key Effective Ratio = (Old tire height / New tire height) * Original ratio. Although neither remains in production today, they are still heavily used on the drag strip circuit as replacement transmissions for 1960s and 1970s vintage cars. Gear Set The difference between the gear set in a bracket race 'Glide versus the Pro Mod transmission are like the differences between night and day. If you wannabe "Ricky Racer" then do what you want, but the stock combination will give you the best overall mix of acceleration / driveability / fuel economy. This will give you your approximate gear ratio. Holding and releasing the sun gear is all it takes to make a B-W OD transmission go into and out of overdrive. On a th400 with stock 2. Before buying a new converter, do consider all variables, such as tire size, gear ratio, expected quarter-mile speed, maximum engine rpm (both physical and where the power begins to drop sharply), engine vacuum at idle and engine torque at low rpm. 5:1 range and cruise at a bit higher rpm that the torque converter stall speed in 1:1 gearing, if you have a over drive gear having a lock-up converter sure helps and a. Stall speeds will vary based on combo. The 4L80E transmission is the advanced progeny of the legendary TurboHydramatic TH400 automatic transmission, and is based heavily on the 400 in both parts and strength, yet featuring an added overdrive gear, a lock-up torque converter and advanced electronic controls. 73 combo)? Rob. i'm guessing you are running a taller tire than me so your rpm's are less than 3100. 48 for 1st, 1. Welcome to Proformance Racing Transmissions | In the early 90′s when the “street car shoot out” & heavy weight door cars were quickly becoming the hottest type of racing around, the need for superior automatics was now an issue. I will be putting down about 1200hp through a gt47-88r and hope to trap high 150's. Hughes Performance is proud to present its all billet planetary gear set for aluminum Powerglides — with a 1. 63 ratio (second) is a dramatic ratio change, allowing engine RPM drop that results in performance engines falling out of the optimal power band. If you are going to keep the stock wheelwells and streetable tires, a 3:1 rear end is about as short as you can go. 73 ratio the mileage increased to 14. i'm guessing you are running a taller tire than me so your rpm's are less than 3100. 56) axle ratios where the "correct" gear was larger than the largest available. That data consists of the ring gear and pinion gear ratio, the height of the tires (diameter from ground to top of the tire while mounted on the vehicle) and the transmission final gear ratio. Which of the following ratios would give me the best combination of gas mileage and some performance without hurting the drivability: 3. 78 over drive ,and as I have a 2. 11, can this be confirmed? My van sounds as if it is in need of another gear when cruising on the open road in fifth, i would like to know the best gear diff ratio or better diff that would fit with out modifications 1995 3L V6 Ford Courier short wheel. A new speedo drive clip is included. Transfer Case Info. Standard Ratios. 0 in high-range). We took my car for a test drive but the transmission would not shift out of first gear. This has a real advantage for vehicles weighing more than 3500lbs. 7 ratio as above a t400 will be revving at 3262rpm. 0 for 3rd gear. At Jake's Performance the 4L80E is our most popular. Now that I am thinking about it the 4L80 might not be a bad trany either with its same first gear ratio as the TH400 but its OD of 0. Part # 112002. they are kinda spendy to build, but with quality parts and a builder who knows what they are doing they can hold up pretty well. 48:1 - 2nd 1. 55 gear ratios, my bird has the 4. The reverse gear has a gear ratio of 2. Our kit mates factory NP203 and NP205 transfer cases, giving a wide array of vehicle application compatibility, not to mention the all-gear combination is capable of handling big block power! Read on, you'll come to find that the NorthWest FabWorks kit is far more than just average. Adding six teeth to correct a speedometer reading 15% high gives us a 42 teeth. This chart has been revised with actual ratios. they are kinda spendy to build, but with quality parts and a builder who knows what they are doing they can hold up pretty well. thats with 373's and 28" tall tires. i'm guessing you are running a taller tire than me so your rpm's are less than 3100. Best Chevy Automatic Transmission Online Buy Chevy Automatic Transmission on eBay now! At Floor Shift Console 1966 1967 Impala Ss Super Sport Caprice Gauges Woodgrain - $899. With my setup I have the same crawl ratio as other Commando guys running the stock TH400/Dana 20 with 4. You can also now calculate when using different transmission gear ratios, like in first gear or in overdrive. 15 & 34 TH400 3L80 Speedo Setup Kit - Housing Gears Seals Retainers Speedometer. I have used that a fair bit to help guys work out gear, wheel and tyre combinations for race use. What ratio to switch to depends a lot on what you have in there now, as you want to gear down approx. Vehicle Weight (in pounds) Vehicle Horsepower: RPM through lights (finish line) Tire Diameter (Hght. Pick up trucks tend to lack traction at the best of times, so you will spin the rear tires in first gear, regardless of the rear end ratio. My old 109 setup was already too much for the stock first gear, but I don't know what ratio would be the best for our setups. 48 first gear of the TH400 combined with crappy 3. Wouldn't matter on the highway. Best thing to do is get a piece of paper and write down: how many vss pulses per tire rev (if you can see the reluctor wheel on the wheel count the keys), how many tire rev's per mile (based on tire circumference), what your axle gear ratio is. All gears are subject to availability and may not be in stock. The transmission pattern is standard TH400, which means a Chevy or a Buick/Olds/Pontiac TH400 can be adapted to the case using factory parts; only the output shaft of the transmission needs to be switched to the Quadra-Trac style. 73 Gear ratio. 8 ratio), victor jr. 43 1st gear ratios. 48:1, Second gear is 1. T&Cs apply. TH400, TH350 vs 4L60E. As fo the gear ratios, don’t forget the GM TH200-4R, which used a Simpson gearset, had basically the same ratio spead as an 4R70W. The best way to determine what gear ratio you need is to determine how you'll be driving the car. The staff has been amazing to work with and takes care of their customers better than any other company I have ever dealt with. This is a much lower ratio than what was common, and provides good acceleration from a stop and is also good for off-road driving. 48:1 second gear. 20 ratio M21 4-speed. 43 1st gear T-10. New sets for both the SS and V6 5th gen Camaro. This transmission is available in 2 speed, 3 speed & 3 speed w/ 2nd gear leaver. A TH400 is certainly much less expensive than a built HP90 and you'll have no problem finding parts for one. if you EVER street or drag race your car go with 410's or 373's. At the bottom of the speedometer face, look for the numbers 940, 960, 1000, or 1020. 73:1 ring-and-pinion ratio and 27-inch diameter rear tires. 63 ratio (second) is a dramatic ratio change, allowing engine RPM drop that results in performance engines falling out of the optimal power band. Although this is a transmission question, I was wondering what most of you guys running higher hp setups and TH400's are using for a first gear ratio. If the rear axle ratio has been changed or the trans originally came from a different vehicle, the governor calibration is probably off and should be changed. its very strong, and a little more expesnive to build than a TH350. Unlike GM's factory six-speeds, which are 'double overdrive' with both fifth and sixth gears under 1:1 ratio, TCI's 6X has a true 1:1 fifth and 0. As a point of comparison, let's compare that to the same effective First gear ratio with a TH400 trans that uses a 2. We have 6L80E Transmissions in stock and free shipping. The default values are for a typical V8 small block Chevrolet vehicle, however you may enter any legal value you wish. Later models used a circular style iron adapter which is generally considered the stronger of the two. Our Heavy Duty Transmissions have found great success in areas outside of Rock Crawling from multiple Baja 1000 and SCORE off-road events to many Pro-Am Drift events. 75 for fourth. Woody's 4x4 | Transmissions Close-ratio first gear with direct-drive in forth gear. ATI's Turbo 400 Drag Racing Transmission. intake, 1050 dominator, 2" Hooker headers, 3" full exhaust w/flowmaster big. 48:1 First gear. rpm = (mph x gear ratio x 336) / tire daimeter using this formula, whith my 72 cheyenne i am doing 2900 or so at 65. this means that dimension "C" is usually longer than dimension "B". Featuring some of the. I wish they offered a few rear gear ratios on the manual like Ford does. i never ran o/d on the 4r70 just so i wouldn't fry the bands if i nailed it and forgot wasnt bad around town on high way i just stayed. The TH350 uses a mechanical kick down switch, whereas the TH400 uses an electric one. What ratio to switch to depends a lot on what you have in there now, as you want to gear down approx. Shifts smooth with no issues, love it!. For the Tire field, enter your tire diameter in inches. The following chart shows just how different the ratios are. 48:1, Second gear is 1. What would you chose and why?. If you think you see some things that may be wrong, please let me know. If you are looking for help with restoring or hot rodding your chevy classic a good place to go for help is Chevy Talk my favorite forum is 1955-1957 ( Modified / pro street / show) forum. TH400, TH350 BOP, 700R4: Let's say that, in our example, we find a white gear with 36 teeth. Gear Star offers three power-output stages for refurbished TH350 transmissions, ranging from 400 hp/400 ft-lbs of torque to 500 hp/450 ft-lbs of torque to 700 hp/550 ft-lbs of torque. It can also be used in lighter vehicles at power levels up to 800 hp and 800lbs. using your info and a 28" tall tire, the rpm is around 3100 at 65. This is my daily driver, and it is not used for racing. ” — Wheels, 1966 Thanks, Mike Sealey, Bill Watson, Hemi Anderson, Argent, and Daniel Stern. Pick up trucks tend to lack traction at the best of times, so you will spin the rear tires in first gear, regardless of the rear end ratio. Ideally simply want to change the rear end back to 3. tire height. in some applications. The 700R4 is best left to applications where its the only option such as 4WD or All WD, tow vehicles, Lower HP applications or customers that are more concerned with budget v/s strength and reliability. Decoding Chevrolet VIN, trim tags, cowl tags, engine, engine block casting numbers, cylinder head casting numbers, intake manifold casting numbers, transmission, interior codes, and paint codes. Which is the best trans th350 th400 or 700r4 and to do is to get the casting numbers off of the trans you want to use and Google it you will be able to find a list of gear ratios for that. Different axle ratios, testing methods, drivers, test conditions and other variables also affect results. Example: If the driveshaft was rotated 12 times and the tire rotated four times, then that is a gear ratio of 3:1. The best way to determine what gear ratio you need is to determine how you'll be driving the car. First gear at 2. the car will be driven in town 90% and raced at track 10%, fuel economy is not a concern. Your not missing a top gear, most cars have a direct drive in top to the rear axle, your just missing one in between. I'm running a '68 L71 427 w/ISKY Z89 solid cam, TRW 11:1 forged, dimple rods, stock steel crank, closed chamber rectangle port heads, comp. For the Tire field, enter your tire diameter in inches. CT8344 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 34 tooth driven Turbo 400 Speedometer Housing, Gears, Seals, Retainer, Bracket Questions?? We can help calibrate what gears you need to work with this speedo housing! A new. They are reliable, and rarely anything goes wrong with them. It has a 0. 66 cl mated th400 drop quick change product description: 12. Machined from high quality, medium-carbon steel forging. but with the gear ratios at th400 has. Buy PATC speedometer ratio adapter decrese 10%: Drive Gear - Amazon. 48, roller bearings throughout, high pressure pro brake valve body, seven clutch forward and direct drum pack, five clutch intermediate pack, oversized intermediate sprag element and outer race, billet steel forward clutch hub, deep aluminum pan, trimmed case for clearance. Confused yet? Assuming that one reading this article knows what a gear ratio is, the difference between two gear ratios in a transmission can be called a ratio spread or drop. Not only is the 700R4 a more durable model, designed for heavy duty usage, but it also provides better gas mileage from the stronger overdrive, and a lower gear ratio by a factor of 20% than what. The fact-checkers, whose work is more and more important for those who prefer facts over lies, police the line between fact and falsehood on a day-to-day basis, and do a great job. Today, my small contribution is to pass along a very good overview that reflects on one of Trump’s favorite overarching falsehoods. Namely: Trump describes an America in which everything was going down the tubes under  Obama, which is why we needed Trump to make America great again. And he claims that this project has come to fruition, with America setting records for prosperity under his leadership and guidance. “Obama bad; Trump good” is pretty much his analysis in all areas and measurement of U.S. activity, especially economically. Even if this were true, it would reflect poorly on Trump’s character, but it has the added problem of being false, a big lie made up of many small ones. Personally, I don’t assume that all economic measurements directly reflect the leadership of whoever occupies the Oval Office, nor am I smart enough to figure out what causes what in the economy. But the idea that presidents get the credit or the blame for the economy during their tenure is a political fact of life. Trump, in his adorable, immodest mendacity, not only claims credit for everything good that happens in the economy, but tells people, literally and specifically, that they have to vote for him even if they hate him, because without his guidance, their 401(k) accounts “will go down the tubes.” That would be offensive even if it were true, but it is utterly false. The stock market has been on a 10-year run of steady gains that began in 2009, the year Barack Obama was inaugurated. But why would anyone care about that? It’s only an unarguable, stubborn fact. Still, speaking of facts, there are so many measurements and indicators of how the economy is doing, that those not committed to an honest investigation can find evidence for whatever they want to believe. Trump and his most committed followers want to believe that everything was terrible under Barack Obama and great under Trump. That’s baloney. Anyone who believes that believes something false. And a series of charts and graphs published Monday in the Washington Post and explained by Economics Correspondent Heather Long provides the data that tells the tale. The details are complicated. Click through to the link above and you’ll learn much. But the overview is pretty simply this: The U.S. economy had a major meltdown in the last year of the George W. Bush presidency. Again, I’m not smart enough to know how much of this was Bush’s “fault.” But he had been in office for six years when the trouble started. So, if it’s ever reasonable to hold a president accountable for the performance of the economy, the timeline is bad for Bush. GDP growth went negative. Job growth fell sharply and then went negative. Median household income shrank. The Dow Jones Industrial Average dropped by more than 5,000 points! U.S. manufacturing output plunged, as did average home values, as did average hourly wages, as did measures of consumer confidence and most other indicators of economic health. (Backup for that is contained in the Post piece I linked to above.) Barack Obama inherited that mess of falling numbers, which continued during his first year in office, 2009, as he put in place policies designed to turn it around. By 2010, Obama’s second year, pretty much all of the negative numbers had turned positive. By the time Obama was up for reelection in 2012, all of them were headed in the right direction, which is certainly among the reasons voters gave him a second term by a solid (not landslide) margin. Basically, all of those good numbers continued throughout the second Obama term. The U.S. GDP, probably the single best measure of how the economy is doing, grew by 2.9 percent in 2015, which was Obama’s seventh year in office and was the best GDP growth number since before the crash of the late Bush years. GDP growth slowed to 1.6 percent in 2016, which may have been among the indicators that supported Trump’s campaign-year argument that everything was going to hell and only he could fix it. During the first year of Trump, GDP growth grew to 2.4 percent, which is decent but not great and anyway, a reasonable person would acknowledge that — to the degree that economic performance is to the credit or blame of the president — the performance in the first year of a new president is a mixture of the old and new policies. In Trump’s second year, 2018, the GDP grew 2.9 percent, equaling Obama’s best year, and so far in 2019, the growth rate has fallen to 2.1 percent, a mediocre number and a decline for which Trump presumably accepts no responsibility and blames either Nancy Pelosi, Ilhan Omar or, if he can swing it, Barack Obama. I suppose it’s natural for a president to want to take credit for everything good that happens on his (or someday her) watch, but not the blame for anything bad. Trump is more blatant about this than most. If we judge by his bad but remarkably steady approval ratings (today, according to the average maintained by 538.com, it’s 41.9 approval/ 53.7 disapproval) the pretty-good economy is not winning him new supporters, nor is his constant exaggeration of his accomplishments costing him many old ones). I already offered it above, but the full Washington Post workup of these numbers, and commentary/explanation by economics correspondent Heather Long, are here. On a related matter, if you care about what used to be called fiscal conservatism, which is the belief that federal debt and deficit matter, here’s a New York Times analysis, based on Congressional Budget Office data, suggesting that the annual budget deficit (that’s the amount the government borrows every year reflecting that amount by which federal spending exceeds revenues) which fell steadily during the Obama years, from a peak of $1.4 trillion at the beginning of the Obama administration, to $585 billion in 2016 (Obama’s last year in office), will be back up to $960 billion this fiscal year, and back over $1 trillion in 2020. (Here’s the New York Times piece detailing those numbers.) Trump is currently floating various tax cuts for the rich and the poor that will presumably worsen those projections, if passed. As the Times piece reported: