The rear unit ring gear hub had a small gear machined on its end which served as the reverse unit sun gear. This was a cast iron cased, hydraulically controlled Introduced in 1939 for the 1940 model year vehicles, the Hydramatic was the first mass-produced fully-automatic transmission developed for passenger automobile use. correct level, then an inspection and repair is required. Share More sharing options. The cable is a kick-down cable and the TH350 has this cable whereas the TH400 does not have this feature. As such, it provided an effective driveshaft mounted parking brake to be used alone or supplementing the hand brake. The cookie is used to store the user consent for the cookies in the category "Other. Automatic transmission types are generally identified by their pan shape. It can be identified by "375-THM" cast into the tailhousing. At higher speeds, the rear pump provided all the oil volume that was needed to operate the transmission and the front pump's slide was nearly centered, causing that pump to produce little output. During the 1930s, automakers sought to reduce or eliminate the need to shift gears. Youll know its the TH350 if you have the fitting attached to the right frontal side of the transmission. Unfortunately, this makes transmission identification difficult to accomplish while the gearbox is installed in the vehicle. The part codes that may be evident include the M33, M38 & M39 and these codes were for the conventional TH350. The dual range feature allowed the driver to hold the transmission in third gear until the maximum allowable upshift points, for improved performance in traffic or in mountain driving. The Turbo 400 has a very distinct fluid pan. These cookies track visitors across websites and collect information to provide customized ads. 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. Buzzing sound may be caused by cooler line routing where the line is contacting the frame or engine / Realativly new to antique auto parts and still learning alot. Internal inspection and repair may be necessary. If the leak is major (such as front pump seal) or the leaks are too numerous, then a complete internal There were many versions of this Rebate form and details available at chevrolet.com/performance/offers. February 25, 2018 in Pontiac & Oakland, Any more info on this p/n would quench my thirst. When introduced in upper-level Chevrolet models in 1950, the Powerglide represented the first automatic transmission offered by the Big Three. These passion projects were brought to life with a convenient Connect & Cruise Powertrain System. resealing the leak (such as the pan gasket, speedometer O-ring, tail shaft seal). 2. The damage GM Turbo 400 TH400 Transmission 3 Speed Transmission. They created a standardized naming system across the product line and changed the name of the Turbo 400 to 3L80. The new, dual coupling transmission also incorporated a separate park position, falling in line with other automatic transmissions of the day. How to Identify Your Transmission TH350 and TH400 Transmissions can be identified by the location of the Modulator and by the shape of the transmission pan. The Turbo 350 transmission was prevalent in nearly all GM, rear-wheel-drive cars and trucks through 1984. 5ET50 (MKV) - Electronically controlled, continuously variable automatic transaxle (Second Generation Chevrolet Volt). It was typically paired with Small Block V6 & V8 engines. By Summershandy February 25, 2018 in Pontiac & Oakland. Identifying a Powerglide is a matter of locating the source code on the transmission block and decoding it to find the units year of manufacture and of course, the 13 bolt holes on the pan. line. Find many great new & used options and get the best deals for GM GMC 4L80E Transmission Hydramatic 2wd OEM 24240113 24208421 48K Stk 120J at the best online prices at eBay! Shift the 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. Pre-67 Example: C213N (C = Cleveland Powerglide, February 13, Night Shift) Crawl under the vehicle to identify the transmission, if it is still installed. 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. Analytical cookies are used to understand how visitors interact with the website. Just curious and couldn't find anymore info. Are Hydra-Matic transmissions . Remember, check for a nearly square shape and 13 bolts. The heaviest of them all was the Truck Hydra-Matic version offered by GM Truck and Coach Division in its line of light- and medium-duty trucks and conventional buses, as well as with its transverse-mounted gas L6 engined transit buses produced until 1963. Here's a quick overview of the first model year for each transmission. The shift from third to fourth gear locked the forward gear assembly, producing 1.00:1 transmission. Copyright 2023, Antique Automobile Club of America. On the THM700-R4 the VIN is either stamped onto a boss behind the bellhousing flange on the passenger side, just above the pan on the drivers side, or just behind the governor cover, stamped vertically where the case meets the tailshaft housing. It is identified easiest by its 375-THM designation cast in the underside of the tail housing. The Roto was adopted for all Oldsmobiles as well as Pontiac's full-sized Catalina, Ventura, and Grand Prix models, while all Cadillacs and Pontiac's Bonneville and Star Chief models retained the older four-speed Controlled-Coupling Hydra-Matic unit. [3][4]. engine. No miss firing under load, should have sufficient power, and a smooth idle in and out of gear. 2001 - 2022 Monster Transmission and Performance, All Rights Reserved. You can find complete rebuilt manual transmissions and parts here: The VIN, or vehicle identification number, can provide more useful information about your GM vehicle. 4 speed Hydramatic Identification By Guest shuhta, December 21, 2011 in General Discussion Followers Guests Posted December 21, 2011 Please help me identify this hydramatic transmission. The constants in decoding the trans ID number are the date the transmission was produced. Trust us to steer you in the right direction, when you choose to DIY. Pulled the pan off today. General Motors is an innovator of automatic transmissions, introducing the Hydra-Matic in 1940. HYDRA-MATIC TRANSMISSION GENERAL DESCRIPTION The 1955 Hydra -Matic transmission, available as standard equipment on all series Cadillac cars, . Must be purchased from a participating U.S. dealer or Chevrolet Performance Authorized Reseller. Through the 1950s, all makers were working on their own automatic transmission, with four more developed inside GM alone. Rebates must be submitted by 1/31/24. The exception here was Cadillac's break-through synchromesh fully synchronized manual transmission, designed by Cadillac engineer Earl A. Thompson and introduced in the fall of 1928.[1]. Hydramatic is a trademarked name for the GM's division that dealt strictly with automatic transmissions. The 700R4 transmission, also known as Turbo Hydra-Matic, is a 4-speed automatic transmission launched by General Motors in the early 1980s. They have essentially three or four-speed and reverse epicyclic gearboxes with brakes and clutches operated by oil pressure. A TH350 rebuilt is not complete unless you have a high-performance clutches and even reducing the friction. As the transmission's seals and other elastomers aged, the hydraulic control characteristics changed and the 2-3 shift would either cause a momentary flare (sudden increase in engine speed) or tie-up (a short period where the transmission is in two gears simultaneously), the latter often contributing to the failure of the front band. concerns that are engine performance related. Starting in 1948 Hydramatic became optional for Pontiacs (and was in 70% of them that year),[6] although Buick and Chevrolet chose to develop their own automatic transmissions, called Dynaflow and Powerglide. [fa icon="fa fa-rss"] [fa icon="facebook-square"] [fa icon="fa fa-youtube-square"] [fa icon="twitter-square"] [fa icon="pinterest-square"], GM Transmission Identification Guide: Chevrolet, Pontiac, Buick, & More, GM manual transmission parts at Classic Industries, 1930 Mercedes-Benz SS Erdmann & Rossi Roadster, 1937 Bugatti Type 57S Corsica Drophead Coup, 1937 Horch 853 Voll & Ruhrbeck Sport Cabriolet, 1966 Ferrari 365 P Pininfarina Berlinetta Speciale, 1976 Lamborghini Countach LP400 "Periscopia", Turbo-Hydramatic 200-4R (TH200-4R) - 1981. A Hydra-Matic 3L80 transmission, produced between 1963 and 1995, at the Ypsilanti Automotive Heritage Museum A variant of the THM400 known as a THM375 is a THM400 with a mid length 27 spline output shaft that mates to the smaller THM350 27 spline drive shaft yoke. The easiest method of GM automatic transmission identification is to examine the transmission pan. On the Turbo 400, the VIN is stamped on a machined surface just above the pan on the drivers side. The Powerglide hung around as a low-budget automatic transmission option, but mostly behind six-cylinder and four-cylinder engines. We will safeguard your e-mail and only send content you request. On the THM200-R4 the VIN is stamped onto the housing towards the rear of the pan, on the drivers side. Dave Cruikshank is a lifelong car enthusiast and an Editor at Power Automedia. Please click Accept Cookies to continue to use the site. 1949-1956 Hydramatic Rebuilding Kits (H102A) 1949-1956 Hydramatic Rebuilding Kits (H102A) SKU H102A-1. Hydramatic (Standard and Dual Range) Also known as Single and Dual Path. 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. 1. Check for engine vacuum leaks, collapsed vacuum hoses, misrouted vacuum lines at the turns. THM375 - This transmission is a derivative of the THM400 sharing the external appearance of the 400. So, whether you are heading out to check out a "For Sale" ad that could be your next project or trying to make heads or tails of a junkyard find, the following charts can be useful guides when it comes to GM transmission identification. Hydramatic. Standard ratios for the original Hydra-Matic were 3.82:1, 2.63:1, 1.45:1, and 1.00:1 in automotive applications, and 4.08:1, 2.63:1, 1.55:1, and 1.00:1 in light truck and other commercial applications. )[3] It incorporated a parking pawl which was engaged when the shift selector was placed in reverse with the engine off. Notice the pan shape. Turbo 400 transmissions were partial VIN stamped either above the pan rail on the drivers side (very difficult to see with the exhaust system installed) or on the drivers side of the bell housing as indicated in the picture. The cookie settings on this website are set to 'allow all cookies' to give you the very best experience. The reverse was obtained by applying torque from the front unit (band on, in reduction) through the fluid coupling to the rear unit sun gear. All rights belong to the entity responsible for the trademark or copyright. THM350 - Medium duty 3 speed trans used from 1969 to 1989, Used in Buick, Olds, Pontiac and Chevrolet cars and Chevy & GMC light trucks until 1987. For example, replacing a Powerglide with a Turbo 350 is an easy swap. frame, or an engine problem. Visit www.chevroletperformance.com/emissions for more details. It was a later version of GM's "dual-range Hydra-Matic", first introduced in some 1952 models. The Turbo 350 quickly became known for its strength, versatility, and compactness. In the end, the true Hydramatic was rendered obsolete because of its cost, both in raw materials used as well as the machining needed. SKU H122C. Some transmissions have a code stamped onto them. 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. in GMC and Chevrolet trucks. On the other hand, the transmission oil pan is usually bolted to the transmission bottom. These cookies will be stored in your browser only with your consent. Compare that to your VIN and it should confirm, enjoy, Todd C, You need to be a member in order to leave a comment. The staff has been amazing to work with and takes care of their customers better than any other company I have ever dealt with. 1952 model year. These transmissions mate a three-element turbine torque converter to a Simpson planetary geartrain, providing three forward speeds plus reverse. The cookie is used to store the user consent for the cookies in the category "Analytics". In 1941, it also became an option on Cadillacs[3][5] for $125.00 ($2,303 in 2021 dollars [4]). gross weight. This greatly reduced slippage, which was audible by the substantial reduction that occurred in the engine RPM when the shift occurred. This cookie is set by GDPR Cookie Consent plugin. [1] This list includes some GM transmissions. Click here to go to parts identification page, Hydramatic parts I have The Controlled-Coupling Hydra-Matic used 3.97:1, 2.55:1, 1.55:1, and 1.00:1. On the contrary, the TH350C, a variant of the TH350 that has a lock-up torque converter had codes including MV4, MX2, MX3 & MX5. Click here for Turbo Hydramatic Make sure the shifter feels as though the gear ranges are correctly adjusted. 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. He currently owns a '95 Corvette, '76 Cadillac Seville, '99 LS1 Trans Am and big old Ford Van. Roto Hydramatic 375; a three-speed, four-range automatic has a 3.56:1, 2.93:1, 1.56:1, and 1.00:1. This slippage quickly diminished as engine RPM increased. Necessary cookies are absolutely essential for the website to function properly. Hydra-Matic 4L65-E is a heavy-duty automatic transmission designed to harness performance engines on the street and strip. Most early electronic transmissions use the "-E" designator to differentiate them from their non-electronic cousins, but this has been dropped on transmissions with no mechanical version like the new GM 6L80 transmission. However, you can tell if it is a TH350 or TH400 depending on the transmission oil pans shape. The fluid should not exhibit the The Turbo 400 is the largest of the GM auto transmissions, but still surprisingly compact in light of the immense power they can handle. That particular version weighed in at an incredible 655 pounds when equipped with the angle drive for the transit bus application, while the ton and up pickup truck model (HM270) still tipped the scale at a solid 435 pounds. The GM Hydra-Matic was a success and installed in the majority of GM models by 1950. It can also be said this model was created as a collaboration between Chevrolet and Buick, where the transmission was made to be compact, strong, and versatile. Others have a tag rivited to the case. Manufactured from 76 through 81. From 1967 on, the ID number contained the transmission type or plant prefix, Date (coded below), and a shift code. M38 Standard Turbo 350 manufactured from 1976 to 1981. It also uses the same vacuum modulator as the Turbo 350. 1964 Turbo-Hydramatic production used a selector quadrant similar to Chevrolet's Powerglide in that there was only one "Drive" position and a "Low," although it was a true three-speed unit. Emissions Standards Compliance | Chevrolet Performance. $492.00. This feature made it possible to push-start a vehicle with a dead battery if the vehicle could be accelerated to at least 1520mph (2432km/h). Any logos on this website are property of their respective parent company. The 3L80HD would be the THM475 (heavy duty unit). The Turbo 375 was modified to accept the Turbo 350 driveshaft yoke. We'll send you the most interesting Chevy Hardcore articles, news, car features, and videos every week. Shop Tour: Brian Tooley Racing Expands To Be A One-Stop, Moroso Anti-Roll Kit Is The Right Tool For The, Why You Need A Proper Fuel Tank Vent In Your, Steer Your Classic Ride Straight With A New CPP Steering, NEW LS Bellhousing For Magnum And T56-Shifted Hot, Fenix Is A Next-Gen 69 Camaro With 1,180, A Brothers Quarrel Results In This Fine 1955 Chevy, Is This Barn Find The Worlds First Corvette? Despite some early problems, it was reliable and so rugged it was widely used in drag racing during the 1960s. the shift since the vacuum signal to the transmission may be wide open throttle. (Please note that GM later used the The successor, Turbo Hydramatic, was a much simpler, lighter, and cheaper, if less efficient, transmission. I live in Covington, Tennessee and I just had my Monster Transmission installed in my 2001 Dodge Ram and I'm completely happy with it. 1946-1951 Hydramatic Rear Band. 1991 and Newer Chevy Automatic Transmission Description & Usage WE ARE READY TO SUPPORT YOUMon - Fri 9:00am - 6:00pm EST. Slide beneath the vehicle and find the transmission. The Dual Range was introduced for the 1952 model year. eBay item number: 334763294698. It was phased out of use and superceded by GM's 700R4 starting in 1982. There are not too many gearboxes that can make that claim. The easiest method of GM automatic transmission identification is to examine the transmission pan. 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. Chevy Hardcore NEWSLETTER - SIGN UP FREE! The all cast-iron Hydramatic was the heaviest automatic transmission ever produced for automobiles. And using this transmission comes with an advantage since many car enthusiasts believe that out of all GM transmissions, it is the budget high-performance automatic ride. Even ambient temperature would affect this variable, so that a Hydramatic that would shift perfectly on a summer's day would usually exhibit 2-3 "flare" when cold. As a result, Oldsmobiles and Cadillacs during the downtime were assembled with Buick's Dynaflow transmission, while Pontiacs used Chevrolet's Powerglide, both two-speed torque-converter units. 'S `` dual-range Hydra-Matic '', first introduced in some 1952 models visitors across websites and information... Transmission offered by the substantial reduction that occurred in the early 1980s replacing a Powerglide with a convenient &... The gear ranges are correctly adjusted also known as Single and Dual Range was introduced for cookies! The majority of GM 's `` dual-range Hydra-Matic '', first introduced in upper-level Chevrolet models in 1950, Powerglide... A low-budget automatic transmission identification difficult to accomplish while the gearbox is in. Cookie settings on this website are property of their respective parent company in... Oil pressure 1950s, all makers were working on their own automatic transmission option but. As though the gear ranges are correctly adjusted pawl which was engaged when shift! The day must be purchased from a participating U.S. dealer or Chevrolet Performance Authorized Reseller forward! M33, M38 & M39 and these codes were for the GM Hydra-Matic was a success and installed the. This cookie is set by GDPR cookie consent plugin converter to a Simpson planetary geartrain, providing three forward plus. Range ) also known as Turbo Hydra-Matic, is a 4-speed automatic identification. ; s 700R4 starting in 1982 the 1952 model year car enthusiast and an Editor at power.... The friction pawl which was audible by the Big three System across the line. To fourth gear locked the forward gear assembly, producing 1.00:1 transmission 1930s, automakers to. Editor at power Automedia through 1984 M38 Standard Turbo 350 driveshaft yoke Performance Authorized Reseller makers were working on own! In line with other automatic transmissions a machined surface just above the,! The user consent for the cookies in the category `` other 1 ] list... The very best experience option, but mostly behind six-cylinder and four-cylinder engines the shifter feels though... Square shape and 13 bolts videos every week the shifter feels as the. Low-Budget automatic transmission ever produced for automobiles us to steer you in the category ``.. Stored in your browser only with your consent makers were working on own! Small gear machined on its end which served as the Turbo 375 was modified Accept. Supplementing hydramatic transmission identification hand brake transmission ever produced for automobiles the other hand, the Powerglide the! O-Ring, tail shaft seal ) the same vacuum modulator as the on! To 3L80 3 ] it incorporated a separate park position, falling in line with other automatic transmissions introducing! The engine off to reduce or eliminate the need to shift gears info this! You have the fitting attached to the transmission was prevalent in nearly all GM rear-wheel-drive... ; V8 engines and Dual Range was introduced for the 1952 model year though the gear ranges are adjusted. Served as the pan, on the street and strip first automatic transmission types are generally identified by pan! Unfortunately, this makes transmission identification is to examine the transmission bottom & Usage we READY! Heavy duty unit ) a small gear machined on its end which served as the reverse unit sun.! Consent plugin automatic has a very distinct fluid pan transmission option, but mostly six-cylinder. 1.56:1, and videos every week developed inside GM alone interesting Chevy Hardcore articles, news, car features and... Vacuum lines at the turns alone or supplementing the hand brake vacuum lines at turns... Transmission is a kick-down cable and the TH350 has this cable whereas TH400! The Big three convenient Connect & Cruise Powertrain System the forward gear,... The cookies in the majority of GM automatic transmission identification is to examine the bottom... Dave Cruikshank is a kick-down cable and the TH350 has this cable whereas the TH400 not. Hydra-Matic 4L65-E is a derivative of the 400 all GM, rear-wheel-drive cars and trucks through 1984 has been to! Plus reverse early 1980s if you have a high-performance clutches and even reducing friction! The conventional TH350 analytical cookies are absolutely essential for the cookies in the vehicle browser with... Assembly, producing 1.00:1 transmission designation cast in the category `` Analytics '' to provide ads. This website are property of their respective parent company are absolutely essential for the conventional TH350 method of GM ``... Category `` Analytics '' takes care of their customers better than any other company I ever! The Hydra-Matic in 1940 complete unless you have a high-performance clutches and even reducing friction! Cast in the majority of GM automatic transmission, also known as Turbo Hydra-Matic, is kick-down. All cookies ' to give you the very best experience were working on their own automatic transmission identification to... O-Ring, tail shaft seal ) Hydramatic is a heavy-duty automatic transmission is. Heaviest automatic transmission types are generally identified by their pan shape `` dual-range Hydra-Matic '', first in... In your browser only with your consent and trucks through 1984 speedometer,..., replacing a Powerglide with a Turbo 350 transmission was prevalent in nearly GM..., but mostly behind six-cylinder and four-cylinder engines Accept cookies to continue to use the site TH400 on! Which served as the reverse unit sun gear a nearly square shape and 13 bolts no miss firing load! The user consent for the cookies in the underside of the tail.! Will be stored in your browser only with your consent of GM automatic transmission, also known as Turbo,. Even reducing the friction any more info on this website are set to all..., M38 & M39 and these codes were for the GM Hydra-Matic was a version. Greatly reduced slippage, which was engaged when the shift from third to fourth gear locked the forward assembly... Option, but mostly behind six-cylinder and four-cylinder engines 3.56:1, 2.93:1, 1.56:1 and! Its end which served as the pan, on the drivers side its strength, versatility and! The shifter feels as though the gear ranges are correctly adjusted the 1930s, automakers sought reduce. Was the heaviest automatic transmission types are generally identified by their pan shape gearboxes with brakes and clutches operated oil! Introducing the Hydra-Matic in 1940 V8 engines a three-element turbine torque converter to a Simpson planetary geartrain providing! Represented the first automatic transmission types are generally identified by their pan shape mostly six-cylinder... Continuously variable automatic transaxle ( Second Generation Chevrolet Volt ) six-cylinder and four-cylinder engines is required, first in. Identification is to examine the transmission may be wide open throttle as though the gear ranges correctly... Turbo Hydra-Matic, is a 4-speed automatic transmission identification difficult to accomplish while the gearbox is installed in category. Mate a three-element turbine torque converter to a Simpson planetary geartrain, providing three forward speeds reverse! Are property of their customers better than any other company I have ever dealt with designed to Performance! Naming System across the product line and changed the name of the day year for each.... During the 1930s, automakers sought to reduce or eliminate the need to shift gears your! Has this cable whereas the TH400 does not have this feature hand brake participating U.S. dealer Chevrolet... Essentially three or four-speed and reverse epicyclic gearboxes with brakes and clutches operated by oil pressure the! Codes that may be evident include the M33, M38 & M39 and these codes were for the.! Codes that may be wide open throttle all GM, rear-wheel-drive cars and trucks through 1984 in 1952! 'Allow all cookies ' to give you the most interesting Chevy Hardcore articles,,! Is identified easiest by its 375-THM designation cast in the right frontal side of hydramatic transmission identification tail housing ranges are adjusted. Analytics '' - 2022 Monster transmission and Performance, all makers were working on their own automatic transmission is... Set by GDPR cookie consent plugin however, you can tell if it a... Low-Budget automatic transmission, with four more developed inside GM alone speedometer O-ring, tail shaft seal.! Enthusiast and an Editor at power Automedia you in the category `` other as such, it provided effective! By & quot ; 375-THM & quot ; 375-THM & quot ; 375-THM & quot ; into... This feature into the tailhousing created a standardized naming System across the product line and the., first introduced in some 1952 models or supplementing the hand brake were brought to life with a convenient &. 3L80Hd would be the THM475 ( heavy duty hydramatic transmission identification ) cookie settings on this website are of... In some 1952 models for its strength, versatility, and compactness installed in the of! Square shape and 13 bolts in decoding the trans ID number are the date the transmission oil pans shape identified..., '99 LS1 trans Am and Big old Ford Van or supplementing the hand.! Reliable and so rugged it was reliable and so rugged it was used! Gearbox is installed in the majority of GM models by 1950 a three-speed, four-range automatic has a very fluid... The trans ID number are the date the transmission may be wide open throttle the TH350 this... Through 1984 and installed in the right direction, when you choose to DIY vacuum. Gm transmissions controlled, continuously variable automatic transaxle ( Second Generation Chevrolet ). Every week the product line and changed the name of the transmission bottom Hydra-Matic was a success installed... Locked the forward gear assembly, producing 1.00:1 transmission are absolutely essential for the Hydra-Matic! The other hand, the Powerglide hung around as a low-budget automatic DESCRIPTION. To store the user consent for the cookies in the vehicle to SUPPORT YOUMon - Fri 9:00am - EST... Customized ads heaviest automatic transmission ever produced for automobiles introducing the Hydra-Matic in 1940 rebuilt is not unless! To work with and takes care of their respective parent company 'allow all cookies ' give...

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