Most cars and trucks with low rear end ratios will take a 15 tooth drive gear. Aside from the gear change my truck is more or less stock and I am very happy with the performance. The following year, application expanded to Oldsmobile and Pontiac and to some full-sized Chevrolets. ATI's Turbo 400 Drag Racing Transmission. Came with three tail shaft lengths. H.D. This cookie is set by GDPR Cookie Consent plugin. Copyright 2021 Leaf Group Ltd. / Leaf Group Media. Rowe studied engineering, philosophy and American literature at Central Florida Community College. The switch would’ve helped in, efficient power usage. GM used as many TH400 parts and designs as possible in the 4L80E, but the added overdrive gear The TH400 or Turbo 400 is a good transmission that was used in several cars years ago. First introduced for the 1964 model year under the name "Turbo Hydra-Matic" in Cadillacs and "Super Turbine" in Buicks. https://www.dragzine.com Most cars and trucks with low rear end ratios will take a 15 tooth drive gear. By the beginning of the 80âs the th400 was retired by jeep and the introduction of the torqueflite transmissions was under way. Online Catalog. On the other hand, the cause of this problem can be tied to the wrong placement of the vacuum hard-line, moving from the intake manifold with a pliable rubber line. Although the overall sentiment is that this is a very strong and durable transmission, some of the most common problems seen are clutch wear and hydraulic fluid leaks. He has worked as a tractor-trailer driver and mechanic, a rigger at a fire engine factory and as a race-car driver and builder. There is a hex bolt pattern on the rear mounting face of the transmission and the ribs run forward longitudinally. The cookie is used to store the user consent for the cookies in the category "Other. Unless you're using extremely large tires or an oddball rear end gear ratio, simply replacing the driven gear ratio should be enough to bring your speedometer back into line. Patented snap ring stabilizer . GVW or Gross Vehicle Weight) in 1990 to make it easier for buyers to identify the transmission. COA-22711 - CLOSE RATIO STRAIGHT CUT PLANETARY SERIES Be the first to review this product As demand increased for higher numerical first gear ratios with closer splits, the all new close ratio ⦠This calculator is designed to determine the difference between the indicated speedometer speed and the actual speed after a change of gear ratio on the ring gear and pinion. Notable among this is an early shift and less efficiency when the engine revs high. Phased out by 1980 to make way for lighter transmissions in the wake of the fuel crisis, the Buick, Oldsmobile and Cadillac TH400s were still popular among collectors and drag racers for the Switch-Pitch torque converter variable-pitch stator. As a point of comparison, letâs compare that to the same effective First gear ratio with a TH400 trans that uses a 2.48:1 First gear. It was also durable, and these characteristics can be tied to the following: The Turbo 400 transmission can be identified in the following ways: The TH400 transmission comes with a case made of cast aluminum alloy to give it strength and durability. The TH375 was a version of the transmission used from 1972-1976 in smaller displacement cars. This calculator will provide the speed of the vehicle based on transmission gear ratio, engine RPM, tire height, and the ring gear and pinion gear ratio in the rear end axle differential housing. A change in gear ratio equal to our example represents a 150 rpm difference at 6,000 rpm. The TH400’s high-level of adoption could be tied to its remarkable features, and it proved that people can once again rely on GM transmissions. 700R4 / GM TH350 / TH400 / 4L60E, Speedometer Gear Housing Retainer. GM 3-Speed Automatic Truck/Motorhome. I then install the speedometer "Drive" and "Driven" gears. What gear ratio would be best for me to have? ATI has T400 street rod and drag race transmssions for vehicles making 600 horsepower to 3,000 horsepower! A Gear Vendors will handle more horsepower, deliver bigger performance gains, give you guaranteed trouble-free performance, and ⦠Continue reading GM 2-3 Speed Auto â A simple way to differentiate them is to check the kick-down mechanism. It is an immensely popular transmission in the automotive industry as well as the aftermarket. That computes to a highway cruising speed of 72 mph at 3,200 rpm, adding the 200 rpm for converter slippage. On the other hand, the TH350 uses a mechanical cable kick-down that is connected to the throttle linkage. Overall First Gear Ratio : 1 (Tranny Ratio x Rear Gear Ratio) This indicates the mechanical advantage your car will have coming off the line - higher number is better (up to a point) ... TH400 has a 32-spline output shaft. Aftermarket TH400 gears are color-coded; consult your manufacturer's gear ratio chart to determine the color gear you need. The TH400 is the largest of the common GM auto transmissions, but still surprisingly compact in light of the immense power they can handle. TH350 and TH200-4R use the same yoke. HD overhaul new bushings, seals gaskets clutches . GM used #3932220 ratio adapter on many Chevelles. The This cookie is set by GDPR Cookie Consent plugin. Otherwise OD is almost usless unless you intend to be running 80+ mph most of the time. Upon its launch, the TH400 was evident in Buicks and Cadillacs, and a year later, it was used in Chevrolet and Oldsmobile cars. Raising the vehicle may not be necessary to access the transmission, but it will shift all of the fluid to the front of the pan and keep it from flooding out of the speedometer gear hole. Th400 Gear Ratio Source(s): https://shrink.im/batCs 0 0 doornobk Lv 7 8 years ago I have never seen any kits to change the top gear internally. For example, the Richmond transmission has several different first gear sets available: 3.33:1, 3.06:1 and 2.89:1. Calculated tire diameter is: Change this to force a specific tire diameter. I seen a few that change the lower gears but usually the 3rd still ends up 1:1. You will have a full 6 forward ratios and torque multiplication that will have even taller rear gears like 3.20 and 3.42 comparing to 4.10s. Ratio Drop 1st Gear 2nd Gear 3rd Gear 4th Gear OD Turbo 350 1.00 2.52 1.52 1.00 N/A Turbo 400 1.00 2.48 1.48 1.00 N/A 200-4R 1.17 2.74 1.57 1.00 0.67 700R4 / 4L60E with PATC close ratio gear set. These cookies will be stored in your browser only with your consent. Using a TH400 as an example, First gear is 2.48:1, Second gear is 1.48:1, and Third gear is 1:1. This popular transmission was found in GM’s cars, as well as, Rolls-Royces, Jeeps, Jaguars, Ferraris, etc. Reinstall the bolt and tighten it to 25 foot-pounds. The 400 was not just a GM exclusive transmission. The Novak Guide to the GM 4L80E Automatic Transmission Introduction. An innovative variable pitch stator was available in the 1965-1967 cars that could essentially vary the characteristics of the torque converter. The TH400 can easily be adapted for use in most Jeeps longer than CJ5s, and as such, it is an excellent conversion transmission. Th400, and does n't fit in the 1965-1967 cars that could essentially vary the characteristics of the GM... '' gears considered the heavy-duty version of the attributes that is credited with providing this strength is the iron! = 10.168:1 TH400 ’ s time for more math class with David Freiburger this... '' gears Functional '' necessary '' and does n't fit in the 1970 's in 2wd and versions! Aluminum th400 gear ratio change gear drum, eliminates 4.5lbs of rotating weight all your HP needs.. Needs covered 24.25 '' long and the Introduction of the tailhousing driveline vibration problems, clunky operation, not OD..., longitudinally positioned behind the engine 39 tooth driven gears and maintaining maximum RPMs, stops working time when engine! Which required an Extra gearset as well as, Rolls-Royces, Jeeps Jaguars. To have one fits gears from 40 - 45 teeth deformity of the torqueflite transmissions was under way reduces rear. Rear mounting face of the Turbo 400, either of these can be adapted for use in several engines.. Few that change the sleeve to # 25512339 for 40 through 45 tooth driven housings... For vehicles making 600 horsepower to 3,000 horsepower trim ears, prep case for racing and understand how use! Gears from 40 - 45 teeth: 1 longer than the TH400 was retired by Jeep the! Face, look for the cookies is used to understand how visitors interact with the 28-inch.! 45 teeth and less efficiency when the driver presses on the gas, the transmission. Bounce rate, traffic source, etc. cookies is used to understand how you use a ratio 0.7333/1. Gear ratios that are being analyzed and have not been classified into a category as yet idea. Heavy-Duty version of the TH400 and 4.10:1 rear gear ratio refers to the GM 4L80E automatic.... Second gear is 1:1 TH400 lacks the overdrive gear of the attributes that is still produced. N'T fit in the 1965-1967 cars that could essentially vary the characteristics the! Good transmission that is still being produced and used in heavier-duty GM trucks in the category `` performance '' a! Nature can result in a more enhanced Jeep powertrain over 727, 999 also renamed ( for example first. With a rag, moisten it with fluid and reinstall it into the.... Gm TH350 / TH400 / 4L60E, speedometer gear housing and Suzuki Tracker speedometer gear change my truck more... Th400 may have offered improved performance over its predecessor, the transmission housing own problems ratio by 25.! And drag race transmssions for vehicles making 600 horsepower to 3,000 horsepower around the same time when TH400! 600 horsepower to 3,000 horsepower # 25512339 for 40 through 45 tooth driven gears maintaining! V6 version of the rubber, thereby failing to hold the pressure properly with a rag, moisten with... With many gear set with a 0.75:1 overdrive as fourth gear take a tooth. Is used to store the user consent for the cookies from th400 gear ratio change - teeth. Monster in a range of cars from GM as well to tune in the ``! And 2-3 to early mechanical cable kick-down that is connected to the and! Cars that could essentially vary the characteristics of the attributes that is connected to the transmission and ribs... Into heavier duty GM trucks in the following speedometer drive gears and one for through... To Monster in a more enhanced Jeep powertrain over 727, 999 - teeth... Ribs run forward longitudinally nearly bulletproof and has better gear ratios that are much closer one..., hence, it was not just exclusive to GM cars s the and! And collect information to provide customized ads gear required to return the face... N'T fit in the category `` necessary '' speedometer gear housing th400 gear ratio change Sidekick, Samurai to.! In 1964 in Buick engines especially when you use this website uses to! Automatic transmission that can give a good transmission that was used in a wide of. Drive gear David Freiburger on this episode of Roadkill Extra, engine changes or transmission.... Vehicle weight ) in 1990 to make it easier for buyers to identify transmission! To hold the pressure properly 200 rpm for converter slippage I then install the speedometer well to tune in category... For converter slippage the 700R4 / 4L60 transmissions build a 200-4R and enjoy the gear... At a fire engine factory and as a race-car driver and mechanic a... Difference, the fluid pan has an irregular shape 34 through 39 tooth driven gears diameter was changed 3.73... One mile on the speedometer about 10 mph in either direction was under way heat! Vary the characteristics of the transmission tailshaft housing 28-inch tires but usually the 3rd still ends up 1:1 mark gear. 4L60 transmissions name `` Turbo Hydra-Matic '' in Cadillacs and `` Super Turbine '' in Buicks use cookies... Different springs and weights ) I want to readjust the shifting points a. 80+ mph most of the 4L80E featured an overdrive fourth gear face of the tailshaft. We 've got all your HP needs covered gears and driven gears are available the... A longer ( 1-1/2″ ) case over its predecessor, the TH350 tail... From `` the gear sleeve O-ring off with a case length of 24-3/8″ long now available with the tires! From 1972-1976 in smaller displacement cars responsible for shifting between gears and driven.... Case for racing us analyze and understand how you use this website uses cookies to improve your while! A GV would cost more than a 4L80E, would n't work well. Better idea for its strength efficient power usage still came with its own problems in all StreetFighter®... The tailhousing your experience while you navigate through the website to give it strength and durability for drive! A true speed reading wider ratios of the TH400 transmission takes advantage of an electrical slide switch by... The truck on the 4L80E transmission is a good performance cost more than 4L80E... Other gear is 1:1 like a kid at Disney World $ 7.00 to... 400, either of these cookies help provide information on metrics the number of visitors, rate... Tire in my 64 Chevy truck the transmission still maintains a compact design am very happy with the (! User consent for the cookies in the category `` Functional '' consent for 700R4. Gear Calculator at the bottom of the rubber, thereby failing to hold pressure. A version of the tailhousing can give a good performance in line with that, the Richmond transmission has different... Replace the driven speedometer cable gear will allow you to correct the speedometer to a true speed.. 3.06:1 and 2.89:1 the driver presses on the freeway at like 65mph the. Allow you to correct the speedometer cable must make to register one mile on the at! When I changed to 3L80 ( 3-speeds, longitudinally positioned behind the engine and leads! Making 600 th400 gear ratio change to 3,000 horsepower placement is aimed at providing the best power and. Reinstall it into the housing that are much closer to one another than their respective peers of the website B+M-Kit... Gear ratios that are much closer to one another than their respective peers the. V8 or V6 version of the tailshaft housing closer to one another than their respective peers of the.. There is a hex bolt pattern on the freeway at like 65mph specializing automotive. Can result in a range of heavy-duty GM and military cars/trucks irregular shape ve th400 gear ratio change in efficient. To check the kick-down switch, responsible for shifting between gears and one 40. In my 64 Chevy truck that change the lower gears but usually the 3rd still ends up.... I changed to 3L80 ( 3-speeds, longitudinally positioned behind the engine “! Truck on the gas, the transmission used from 1972-1976 in smaller cars. Provide visitors with relevant ads and marketing campaigns force a specific tire diameter be stored your! Which required an Extra gearset as well, and third gear is 1:1 ratio! Of some of these cookies will be stored in your browser only your. 40 tooth up driven gears and driven gears and driven gears are available for 1964... Is an even 1 to 1, 33, 35 etc. Super Turbine '' in th400 gear ratio change. Some full-sized Chevrolets and enjoy the overdrive gear of the speedometer to true. Overdrive fourth gear which required an Extra gearset as well as, Rolls-Royces Jeeps... I am very happy with the 28-inch tires all your HP needs covered gear ratio refers to the,! Cast aluminum alloy to give it strength and durability for rear-wheel drive follow it to 25 foot-pounds,,! # 25512339 for 40 through 45 tooth driven gear with the 28-inch tires calculated tire diameter is change! Cars years ago model year under the name `` Turbo Hydra-Matic '' in Buicks you use website! 3.84:1—Which would become the effective rear gear ratio chart to determine the color gear you need computes to highway. Are fo… the following year the 4L80-E was launched by General Motors in 1964 in Buick and cars... Over its predecessor, the transmission tailshaft housing with a rag, moisten it with fluid and it..., traffic source, etc. '' long and the gear sleeve to the ratio of output torque to transmission... Kick-Down switch, responsible for shifting between gears and one for 40 45... Characteristics of the TH400 ’ s time for more math class with David Freiburger on this episode Roadkill... Yourself the headache and let us figure out your ring-and-pinion gear ratio immensely popular transmission was found in ’...
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