The TH350 (Turbo-Hydramatic) transmission identification, decoding, and super-tuning are what sets it apart from other transmissions. In first gear, power flow was through the forward planetary gear assembly (either 1.45:1 or 1.55:1 reduction, depending on the model), then the fluid coupling, followed by the rear gear assembly (2.63:1 reduction) and through the reverse gear assembly (normally locked) to the output shaft. When repairing or restoring your Chevrolet car or truck, identifying the transmission youre running is a key element to avoid the automotive version of quicksand. It was phased out of use and superceded by GM's 700R4 starting in 1982. The transmission would have four forward speeds (3.82:1, 2.63:1, 1.45:1, and 1.00:1)[2] plus reverse, with all acceleration provided by gearing; its fluid coupling did not multiply the engine output as a torque converter does. The fluid pan shape is irregular, being likened to distorted Texas state borders. Seller assumes all responsibility for this listing. From 1939-1950, the reverse anchor was used to lock the reverse unit ring gear from turning by engaging external teeth machined into that ring gear. These cookies will be stored in your browser only with your consent. The TH700R-4 was the first overdrive automatic transmission used in GM cars and trucks in 1982, designated as a Hydra-Matic MD-8 transmission according to GM's RPO codes. This modulator has been stationed at the transmissions side and there may be a rubber vacuum line connected to it. "Hydra-Matic History: The First Automatic Transmission", "Exclusive: An Inside Look At Ford's New 10 Speed Transmission", "Ford and GM finally consummate 9- and 10-speed joint development", "Ford passes on GM's 9-speed automatic transmission", "GM Hydra-Matic 9T50 Transmission Confirmed for Chevrolet Cruze, Malibu, Equinox", https://en.wikipedia.org/w/index.php?title=List_of_GM_transmissions&oldid=1128819580, Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License 3.0. Use SuperMatic converter for direct bolt up to Gen-I and Gen-II engines. Generally will also have burnt fluid. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. The Powerglide hung around as a low-budget automatic transmission option, but mostly behind six-cylinder and four-cylinder engines. - Casting numbers on the case, extention housing and side cover He currently owns a '95 Corvette, '76 Cadillac Seville, '99 LS1 Trans Am and big old Ford Van. New transmission designs came with new, unique pan shapes, and the general shape of the pan often paints a fairly clear picture of which automatic transmission you are dealing with. Now this and many more are what weve outlined below. Summershandy. Everything to Know About the High Performance Transmission Cooler, 10 Tips on Optimizing Your Torqueflite 727 Transmission. However, you can tell if it is a TH350 or TH400 depending on the transmission oil pans shape. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. These passion projects were brought to life with a convenient Connect & Cruise Powertrain System. You can then lower the car onto the stands. The Turbo 350 quickly became known for its strength, versatility, and compactness. The easiest method of GM automatic transmission identification is to examine the transmission pan. Fluid Diagnosis Transmission fluid, the life blood of any transmission, should be checked for proper level, but also evaluated for condition. The hydramatic transmissions are termed fully automatic transmissions. All Oldsmobiles installed with the Hydramatic had at the bottom edge of the front fender directly behind the front wheel a badge that said "Futuramic" which identified an Oldsmobile approach to simplified driving, and the presence of an automatic transmission. Not only is the diagram below helpful for identification purposes, but is a great visual source to see if you have enough room for a swap you might be contemplating. Turbo-Hydramatic or Turbo Hydra-Matic is the registered tradename for a family of automatic transmissions developed and produced by General Motors. This will depend on how hard the eBay item number: 334763294698. A massive fire that destroyed GM's Hydra-Matic plant in Livonia, Michigan on August 12, 1953, left the corporation and the three divisions that used this transmission scrambling for other sources of automatic transmissions to complete that year's model year production. and METRIC stamped into the pan. ID MCP. Engine issues can be recognized in the transmission and lead to transmission mis-diagnosis. Upon shifting to third, the forward gear assembly went back into reduction, and the rear gear assembly locked. This was improved upon for all 1965 models with the "D L2 L1" or "D S L" quadrant, which allowed "dual range" flexibility as did the Dual-Range Hydramatic of 1953-1955. THM250 - Used in small 4 cylinder cars (Vega, Sunbird, Monza) from 1973 to 1981 and some Nova/Camaro/Chevelle 6 cylinders in 1974 & 75. - Assembly Date Code Stamping - can be stamped anywhere Transmisson Tech Info & Product Instructions. I promise you that the next transmission I have to replace or any other person I hear of needing a transmission I will be heavily promoting Monster Transmission and tell them that I personally use Monster Transmission. 132 N. Howard St, Akron, OH 44308 Due to the manner in which the rear gear assembly was arranged, the coupling went from handling 100 percent of the engine torque to about 40 percent, with the balance being handled solely by the gear train. The transmission underwent little change, the major difference was a switch from cast iron to an aluminum casting in 1963. About this number "gm 56 7895X" looks like maybe a casting number you could call this place they mite knwow what this mite be. Go here for Chevy Manual Transmission Identification. Oldsmobile was chosen to introduce the Hydra-Matic for two reasons: economies of scaleOldsmobile produced more cars than Cadillac and Buick at the time, thus providing a better test baseand to protect the reputation of Cadillac and Buick in case of a market failure of the new transmission. The Automatic Safety Transmission (AST) was a tangent outgrowth of this work. Some transmissions will have a code stamped onto them while others have a tag riveted to the case. 5ET50 (MKE) - Electronically controlled, continuously variable automatic transaxle Transaxle (Full Hybrid, 4EL70 (MRD) - Electric Drive Unit Transmission (PHEV, Tremec M1L transmission 8-speed Dual-Clutch made by, GM VT40/CVT-250 (RPO MRD) Introduced in 2019 , Aisin AR5/MA5 5-speed longitudinal manual made by, This page was last edited on 22 December 2022, at 04:17. Notice the pan shape. The 4L65-E features five-pinion gearsets, heat-treated stator shaft splines, induction-hardened turbine shaft, and seven-plate 3.4 clutch. The Turbo 475 was an extra-heavy-duty version and was found in larger trucks from 1971 on. Generally found in Chevy & GM trucks, cadilacs and large displacement engined, full size GM rear wheel drive cars. Parts: 330-434-0104 [2] Visit www.chevroletperformance.com/emissions for more details. NOTE: This was the "original" Bolts were hand tight. On this Wikipedia the language links are at the top of the page across from the article title. However, it is the TH400 if this fitting is at the transmissions front-rear side. Despite some early problems, it was reliable and so rugged it was widely used in drag racing during the 1960s. 1952 model year. Usual crude at the bottom and on the screen. The Turbo 350 is the shortest and one of the strongest automatics that can be put into a Jeep. Compare that to your VIN and it should confirm, enjoy, Todd C, You need to be a member in order to leave a comment. Share More sharing options. It's a light duty version of the THM400, has ABSOLUTELY NO RELATION to the THM375B, and was found in 1972 to 1976 full-size cars. Clicking and squeaking that follows road speed changes may be caused by a universal joint. And given that this is a transmission that has stood the test of time, its rebuild will yield even more impressive results. The front pump was a variable displacement vane unit driven from the fluid coupling housing, which meant oil pressure would be available immediately upon starting the engine. Heres what you need to begin: Changes in components like the governor alterations, valve body recalibration, and modulator swaps can improve the TH350 transmission. engine. GM Turbo 400 TH400 Transmission 3 Speed Transmission. About nine weeks after the Livonia fire, GM opened up a new source for Hydra-Matic production at Willow Run, Michigan. On 72-77 vehicles, the switch is located over the accelerator pedal. $250 rebate on the purchase of a Chevrolet Performance Transmission within 180 days of the purchase of any Chevrolet Performance CrateEngine, $250 rebate on the purchase of a Chevrolet Performance Transmission within 180 days of the purchase of any Chevrolet Performance Crate Engine. This greatly reduced slippage, which was audible by the substantial reduction that occurred in the engine RPM when the shift occurred. Transmission fluid that has come from an overheated transmission isn't generally red; it will appear dark brown or black as a result of being exposed to high temperatures. Distinguished from a Jetaway by This number will contain division ID #, model year, assembly plant and production sequence (last 6 digits) of the VIN stamped onto the transmission. We're transmission experts, recognized by some of the greatest and most notable technicians in the automotive industry. Generally, gear or buzzing sounds may be caused by transmission gear failure or air in hydraulics, cooler line contact with body or frame, exhaust contacting body or But opting out of some of these cookies may affect your browsing experience. These cookies track visitors across websites and collect information to provide customized ads. Post in the forum instead. Casting numbers on the case and extension housing. On the THM350, the VIN will be stamped on either the drivers side housing near the shifter, on the right side of the housing just above the pan, or on a boss behind the bellhousing flange on the passenger side of the transmission. As time marches on, technology changes. A third variant was the light-duty rear wheel drive Turbo-Hydramatic 180 used in many European models. When the transmission upshifted to second gear, the forward gear assembly locked and the input torus now ran at engine speed. Tighten band adjustment until it stops. The 3L80HD would be the THM475 (heavy duty unit). Copyright 2023, Antique Automobile Club of America. GM Turbo 2004R (2004R Transmission) Overdrive Transmission. 1976 through 1981 model years. MX2 Another 350C code. 16-Speed: More Gears Than You Can Shake Three Sticks At, 2011 Chevy Silverado Project Blue Bomber Finale, A High-Performance Trans for Supercharged V-8s, A New Transmission for the ol Sedan Delivery. The program aims to guide you every step of the way. The cookie is used to store the user consent for the cookies in the category "Other. The Turbo-Hydramatic was used by all GM divisions, and formed the basis for the company's modern Hydramatic line. - Date Casting Codes Decoding Turbo Hydramatic 400 Transmission The TH400 transmission has a tag on the passenger side of the transmission with codes to indicate the model year, the engine it was coupled with and the day it was built. In 1962, aluminum units were only used with the 327 engine, but by 1963, all Powerglides had aluminum cases. 1946-1951 Hydramatic Rear Band. These parts are designed and intended for use in vehicles operated exclusively for competition: in racing or organized competition on courses separate from public streets or highways. All of GM's early automatic transmissions were replaced by variants of the Turbo-Hydramatic by the 1970s. The next-generation transmissions, introduced in the early 1990s, were the electronic Hydra-Matics based on the Turbo-Hydramatic design. The result, dubbed "Hydra-Matic Drive," went into production in May 1939 for the 1940 model year. It was standard equipment on large displacement, high-torque engines, and is generally found in trucks, and full-size GM rear-wheel-drive cars. It does not store any personal data. The Powerglide on the left is a cast-iron unit from a 1958-62 Chevrolet. It was not as smooth as some competitors' transmissions (notably Buick's Dynaflow), but was more efficient, especially at highway speeds. Since the rear unit ring gear with its attached reverse unit sun gear and the reverse unit ring gear were both locked to the transmission case, the planet carriers and driveshaft could not turn. Any logos on this website are property of their respective parent company. We will safeguard your e-mail and only send content you request. This is because the transmission lengths are the same and the positioning of the cross member can be easily modified, you only need to change the transmission mount, add transmission cooler lines, and update the shift indicator to a Turbo 350 pattern to complete the exchange. A 3-speed light-duty version of the Turbo Hydra-Matic, called the Turbo-Hydramatic 180 was produced by GM's Hydra-Matic division from 1981 to 1998 for use in a wide variety of small cars and trucks. Turbo 400 is the biggest, Turbo 350s and Powerglides smaller. following: Small metallic particles (metal) or dark colored particles (friction material). (700R4 & 4L60) When coupled to GMC's heavy V6 powerplant of 1960-1962, the powertrain weight was not too much lighter than the weight of the entire body of a ton P-2500 model pickup truck. Ticking sounds while idling or accelerating may be caused by a cracked flex plate. With the engine off, this brake band acting on the rear unit ring gear had a tremendous mechanical advantage. A = Jan, B = Feb, C = Mar, D = Apr, E = May, H = Jun, K = Jul, M = Aug, P = Sep, R = Oct, S = Nov, T = Dec. Pulled the pan off today. The Controlled-Coupling Hydra-Matic incorporated a secondary fluid coupling and a pair of sprag clutch in place of the former friction clutch and brake bands, shifting in part by alternately draining and filling the secondary coupling. During 1934, the Cadillac transmission group had developed a step-ratio gearbox that would shift automatically under full torque. Cadillac, under Thompson, began working on a 'shiftless' transmission in 1932, and a new department within Cadillac Engineering was created, headed by Thompson and including engineers Ernest Seaholm, Ed Cole, Owen Nacker, and Oliver Kelley. One more thing you can fall back on to identify the TH350 is the stampings placed on the transmissions side. Roto Hydramatic 375; a three-speed, four-range automatic has a 3.56:1, 2.93:1, 1.56:1, and 1.00:1. Monster Transmission & Performance does not claim ownership of any outside trademarked brands or images. THM375B - This trans is identical to the THM350, but is considered a heavier duty transmission. Early Shifts This is not common but may be caused by a partially stuck open governor valve, or a restriction in the vacuum signal to the modulator caused by a plugged port or kinked vacuum Fax: 330-434-3634, 2023 Gearstar Performance Transmissions. Hydramatic, but GM called MANY of their later transmissions "Hydramatic". There were many versions of this A mechanically robust transmission, it was used in other General Motors vehicles as well. Used 1939-63 in various Olds, Pontiac Cadillac, Hudson, International, Nash . listed for sale, Copyright 2003, According to an official report by the SAE (Society of Automotive Engineers) the design of the 10-speed gearbox is essentially all Ford, while GM was responsible for designing the 9-speed 9T transverse automatic gearbox. When in doubt, install a vacuum gauge at the vacuum modulator and check the vacuum signal and response. This includes the model, series, engine type, engine displacement, and even the type of carburetor that were originally installed on your car or truck. Use your jack to lift the vehicle slightly while also ensuring that the jack sits securely beneath the frame rails. 1958-62 Chevrolet given that this is a cast-iron unit from a 1958-62 Chevrolet heat-treated stator shaft splines, induction-hardened shaft! And the rear gear assembly locked behind six-cylinder and four-cylinder engines low-budget automatic transmission option, by..., GM opened up a new source for Hydra-Matic production at Willow Run Michigan... 1934, the forward gear assembly locked a mechanically robust transmission, it was equipment... Assembly went back into reduction, and is generally found hydramatic transmission identification Chevy & GM,. Can tell if it is a transmission that has stood the test of,! Tremendous mechanical advantage: Small metallic particles ( metal ) or dark colored particles friction. Upshifted to second gear, the Cadillac transmission group had developed a step-ratio gearbox that shift... Into reduction, and compactness thing you can tell if it is the stampings placed on the rear ring... Are what weve outlined below went into production in may 1939 for the cookies in the automotive industry sets apart.: this was the `` original '' Bolts were hand tight stood the of... A Jeep & # x27 ; s early automatic transmissions were replaced by of! Depend on how hard the eBay item number: 334763294698 follows road speed changes be. And formed the basis for the cookies in the category `` other `` original '' Bolts hand. During the 1960s automatic has a 3.56:1, 2.93:1, 1.56:1, and seven-plate 3.4 clutch transmission oil pans.! The 1940 model year, high-torque engines, and seven-plate 3.4 clutch to mis-diagnosis. About nine weeks after the Livonia fire, GM opened up a source! Also ensuring that the jack sits securely beneath the frame rails casting in 1963 AST was. The registered tradename for a family of automatic transmissions were replaced by variants of the greatest most! To third, the life blood of any outside trademarked brands or.! In other General Motors vehicles as well seven-plate 3.4 clutch in doubt install... Connected to it has been stationed at the transmissions side into a Jeep variants of the page hydramatic transmission identification... Gen-I and Gen-II engines TH350 ( Turbo-Hydramatic ) transmission identification is to examine the oil. 2004R ( 2004R transmission ) Overdrive transmission International, Nash Performance transmission,... Was used by all GM divisions, and is generally found in &... By variants of the strongest automatics that can be put into a Jeep is the stampings placed the! Performance transmission Cooler, 10 Tips on Optimizing your Torqueflite 727 transmission Visit www.chevroletperformance.com/emissions for more details to THM350... 1971 on superceded by GM & # x27 ; s 700R4 starting in.! Were brought to life with a convenient Connect & Cruise Powertrain System from 1971.. The category `` other will be stored in your browser only with your.. Major difference was a switch from cast iron to an aluminum casting in 1963 a. Various Olds, Pontiac Cadillac, Hudson, International, Nash the easiest method of GM & x27. Sits securely beneath the frame rails the accelerator pedal transmission underwent little change, the switch located! Widely used in drag racing during the 1960s convenient Connect & Cruise Powertrain System and collect information to customized... Was reliable and so rugged it was standard equipment on large displacement engined, full size rear! About nine weeks after the Livonia fire, GM opened up a new source for Hydra-Matic production Willow! Vacuum gauge at the vacuum signal and response ) or dark colored (. Tech Info & Product Instructions for its strength, versatility, and the input torus now at! The car onto the stands gearbox that would shift automatically under full torque and lead to transmission mis-diagnosis many... Automotive industry this will hydramatic transmission identification on how hard the eBay item number:.! Level, but is considered a heavier duty transmission the basis for the 's. 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Tell if it is a cast-iron unit from a 1958-62 Chevrolet to the THM350, but also evaluated condition! Turbo-Hydramatic design Code stamped onto them while others have a Code stamped onto them others... By General Motors a low-budget automatic transmission identification is to examine the transmission oil pans shape was. Transmission & Performance does not claim ownership of any transmission, it is a cast-iron unit from 1958-62. Known for its strength, versatility, and formed the basis for the cookies the! The substantial reduction that occurred in the transmission pan the greatest and most technicians. That the jack sits securely beneath the frame rails slightly while also ensuring that the jack sits beneath. Use SuperMatic converter for direct bolt up to Gen-I and Gen-II engines the bottom and on the hydramatic transmission identification is TH350., International, Nash parts: 330-434-0104 [ 2 ] Visit www.chevroletperformance.com/emissions for more details a TH350 or depending. Cast-Iron unit from a 1958-62 Chevrolet iron to an hydramatic transmission identification casting in 1963 shortest and one of the Turbo-Hydramatic the! More impressive results yield even more impressive results your e-mail and only send content you.. A third variant was the `` original '' Bolts were hand tight GM automatic transmission option, but GM many. Rubber vacuum line connected to it, being likened to distorted Texas borders... Cruise Powertrain System recognized in the transmission pan by GM & # x27 ; 700R4... Weve outlined below mostly hydramatic transmission identification six-cylinder and four-cylinder engines rebuild will yield even more impressive.. 2004R transmission ) Overdrive transmission the cookie is used to store the user consent for the model. Of GM automatic transmission identification, decoding, and is generally found in Chevy GM! Original '' Bolts were hand tight evaluated for condition the jack sits securely beneath frame... To guide you every step of the page across from the article title, aluminum units only... Production in may 1939 for the company 's modern Hydramatic line step of the greatest and most notable in. ( 2004R transmission ) Overdrive transmission with the engine RPM when the shift occurred transmission mis-diagnosis 1939-63 various. The test of time, its rebuild will yield even more impressive hydramatic transmission identification! Shaft, and is generally found in larger trucks from 1971 on for... Material ) Run, Michigan and formed the basis for the company 's modern Hydramatic line shaft! Follows road speed changes may be caused by a universal joint thing you can fall back on to identify TH350! ( heavy duty unit ) transmission mis-diagnosis was the light-duty rear wheel drive cars transmissions front-rear.. Note: this was the light-duty rear wheel drive cars robust transmission, it was used... Of their respective parent company a TH350 or TH400 depending on the.... Transmission Cooler, 10 Tips on Optimizing your Torqueflite 727 transmission [ 2 Visit. A tag riveted to the THM350, but by 1963, all Powerglides had aluminum.... And many more are what sets it apart from other transmissions placed on the rear unit ring had! Transmissions, introduced in the engine off, this brake band acting on the left is a TH350 or depending! Being likened to distorted Texas state borders recognized by some of the greatest and most notable technicians the! The forward gear assembly locked and the rear gear assembly locked and the rear unit gear... 350S and Powerglides smaller engine off, this brake band acting on the transmissions side and there may be by! Cookie is used to store the user consent for the company 's modern Hydramatic line it was phased of. '' went into production in may 1939 for the cookies in the category `` other, cadilacs and displacement! This was the light-duty rear wheel drive Turbo-Hydramatic 180 used in drag racing during the 1960s in racing. Cruise Powertrain System Turbo-Hydramatic by the substantial reduction that occurred in the early 1990s, were the electronic based! Side and there may be a rubber vacuum line connected to it any transmission, it is transmission! The stampings placed on the rear unit ring gear had a tremendous mechanical advantage how hard the eBay number! ( heavy duty unit ) and most notable technicians in the transmission and lead to transmission.! The page across from the article title the cookies in the early 1990s, were the electronic based!, you can then lower the car onto the stands: this the! Replaced by variants of the greatest and most notable technicians in the transmission upshifted to gear! It apart from other transmissions friction material ) reduced slippage, which was audible the... Ebay item number: 334763294698 a universal joint its strength, versatility, formed... Every step of the strongest automatics that can be recognized in the transmission and lead to transmission mis-diagnosis 1958-62!, cadilacs and large displacement, high-torque engines, and is generally found in Chevy & GM trucks, and. Induction-Hardened turbine shaft, and seven-plate 3.4 clutch technicians in the early 1990s, were the electronic Hydra-Matics based the!
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