691747 OR 591747. However, there were several design upgrades and modifications made during the total production run. INFO GUIDE: 1966 Pontiac GTO (Coupe, Hardtop & Convertible) On the left is the M20 countershaft, which is easily identified by the larger 29-tooth gear. Making this separation makes the job easier. The 26-spline input shaft yields greater torque capacity via the number of teeth and greater surface area. How To Identify Chevy Four-Speed Transmissions FIRST TRANSMISSION. 19. 1981-1990. CASE: GM 20 3799193 D1162 TAIL: 3707195 COVER: (4 bolt) 3731911 . They are found primarily in GM and Chevrolet trucks, Blazers, Suburbans and many other models falling under the 1/4-ton to 1-1/2-ton platforms. The one on the right is an aluminum-case Powerglide. This includes but is not limited to Ford, Chevrolet, General Motors, Dodge, Mopar, or any other trademarked or copywritten content. 10. This list includes some GM transmissions. Pure dumb luck will lead you to a completely unmolested Muncie. Other than the shape of the fluid pan, another key way to identify the Turbo 350 is by the vacuum modulator. 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. // ]]> Ning Network Name Goes Here. By 1963, the General had developed and worked with the Saginaw Corporation to develop a proprietary Chevy four-speed (based on components used in the Borg-Warner transmission). GM produced many transmission variants over the years, we included some of them here, but our main focus is identifying the fluid pans for Powerglide, Turbo 350, and Turbo 400. General Motors is an innovator of automatic transmissions, introducing the Hydra-Matic in 1940. The vehicle identification number (VIN) is a unique identifier for each vehicle (VIN). This is an M21 with 10-spline input shaft and cast-iron bearing retainer. The Turbo 350 quickly became known for its strength, versatility, and compactness. Images courtesy chevelles.com. Apart from numbers, General Motors transmission ID tag has codes. Even the Muncie has its limitations, but they are significantly higher than the Saginaw or Borg Warner. This number will contain a division identification number, the model year, and the assembly plant and production sequence (last six digits) of the vehicle identification number (VIN) stamped onto the transmission. Terms of Service. The Muncies appearance, design, and operation did not change much during the transmissions use in GM production cars. 2023 Power Automedia. We are grateful for the fact that Monster Transmission has gone BEYOND and we will continue to be the best publicity that you will every have.. General Motors has produced a myriad of versions of its fabled automatic transmissions over the years, although three models make up the bulk of pre-ECM GM slushboxes; the Powerglide, the Turbo-Hydramatic 350 (Turbo 350), and the Turbo-Hydramatic 400 (Turbo 400). the years that you narrowed it down to when you deciphered the Casting Numbers to the right. General Transmission Identification. Author: Alan L. Colvin. Number is located on side cover. Muncie M20/M21/M22 Main Case Identification, Patent Pending, 7/8-inch Countershaft Bore, Patent Pending, 7/8-inch Countershaft Bore used mostly in 1964, Patent Number, 7/8-inch Countershaft Bore, Patent Number, 1.000-inch Countershaft Bore, Thin Fin Tailshaft, Driver-Side-Mounted Speedometer, 27 Spline Output, Thick Web Tailshaft, Driver-Side-Mounted Speedometer, 27 Spline Output, Pontiac Catalina Long Tailshaft, Side-Mounted-Speedometer, 27 Spline Output, Passenger-Side-Mounted Speedometer, 27 Spline Output, Passenger-Side-Mounted Speedometer, 32 Spline Output, Early Side Cover Used With 3857584 Tailshaft Housing, Late Side Cover - Long Boss - With A Transmission Controlled Spark Switch, Late Side Cover - Short Boss - With A Transmission Controlled Spark Switch, Late Side Cover - Long Boss With A Neutral Safety Switch, Build facility (i.e., P = Muncie Transmission Plant), Month code it was assembled (i.e., 05 = May), Day code it was assembled (i.e., 25 = 25th Day), Month code it was assembled (i.e., D = April) (Beginning in 1967, Muncie used letter codes for the month code: A=Jan, B=Feb, C=Mar, D=Apr, E=May, H=June, K=July, M=Aug, P=Sep, R=Oct, S=Nov, T=Dec), Day code it was assembled (i.e., 12 = 12th Day), Month code it was assembled (i.e., M = August), Day code it was assembled (i.e., 03 = 3rd Day), Gear ratio set (i.e., A=M20) (This code was added to identify ratios. The M20 and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and close-ratio units. Chevrolet Chevy Transmission Identification and Decoding When properly identifying a Saginaw transmission, the casting numbers are a surefire way to know for certain what youre looking at. You can find out from the specifications or by checking the foot pedals. The 1969 and later models use a bolt to secure the linkage to the transmission. The Turbo 350 transmission was prevalent in nearly all GM, rear-wheel-drive cars and trucks through 1984. Build your own custom newsletter with the content you love from Chevy Hardcore, directly to your inbox, absolutely FREE! This is the M21 10-spline input shaft with a single groove and the applicable 27/22/19/17-tooth countershaft. The Turbo 350 quickly became known for its strength, versatility, and compactness. CD-68-315953 Transmission block casting number R 7 T 28 GM number 3890564 Martinius. In order to correctly identify a Muncie four-speed transmission, several visual clues are needed, and those cues involve the casting numbers on the case, side cover, and tailshaft. Keep this in mind when you're searching for a Muncie transmission. If you prefer official decoders, you can check the National Highway Traffic Safety Administrations website. The optional 4-speed was a $184.02. 3925656 is the casting number for the saginaw used in 68-75 at least. Pre-1969 Muncies use a stud and nut at the indicated attachment point, while 1969 and later boltPRE 69' MUNCIE & ALL 69' & LATER MUNCIEMuncies use a bolt as illustrated on the right.BORG-WARNER SHAFTSTRANS ID 452,453 MUNCIE M-22 (453)TRANS ID 451 Although the Muncie's bloodline goes way back, this legendary gearbox entered service for the Chevrolet Division in 1963. As long as you have the correct transmission shift levers, it should't be much to convert to the later trans, but I'd probably start with the Saginaw, given the choice. It was phased out of use and superseded by GMs 700R4 starting in 1982. On the Turbo 350, 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 bell housing flange on the passenger side of the transmission. transmission identification confusion | Chevy Tri Five Forum Found on 76 through 84 models. I have four transmissions, which I need to identify, before I can proceed. When other companies started making automatic transmissions in the 1950s, GM already had four in-house. He has spent years tinkering with vehicles and attended numerous car shows. The Powerglide on the left is a cast-iron unit from a 1958-62 Chevrolet. Cangialosi tells us all M20 and M21 transmissions were produced with both 10- and 26-spline input shafts. Take the following steps to access and place the transmission pan: Most manufacturers stamp the transmission identification numbers on the transmission housing. All rights reserved. Also, the chances of older cars having an intact manual are slim. Casting is located above side cover, on trans. The Muncie was originally a stronger alternative to the T-10 and Super T-10 because it could take the torque. This is when you have to remove the side cover to see what's inside. The 17-character number is a form of code that identifies the vehicle's specifications. Here's another view of the M22's input shaft and countershaft. Pre-67 Example: C213N - (C = Cleveland Powerglide, February 13, Night Shift) How to identify chevrolet gmc manual transmissions 3925658 does not match any casting numbers in my books. Use the shifter to shift gears and note the number of times it shifts. my Saginaw #'s . However, this method requires extensive knowledge of the oil pans. However, there are some methods you can apply to determine the transmission type your car uses. If the car has high-performance upgrades that substantially raise the engines torque output above 300 to 350 lb./ft. The trailing letters denote what the engine was installed in. 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. There is also a fine-tooth 26-spline input shaft employed from 1971-'74. In 1974, the two-speed box then went to the great scrap heap in the sky. 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. Evolutionary designs came with unique pan shapes, which are clear indicators of which transmission you are dealing with. Its no secret that the Saginaw and Borg Warner transmissions were not built to handle the kind of power that a Muncie transmission could withstand. For a better experience, please enable JavaScript in your browser before proceeding. This patent number, according to Cangialosi, can be found cast into most Muncie four-speed main cases. Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks. From 1963-'70, the Muncie was fitted with a 27-spline mainshaft and must have the corresponding slip yoke. Transmission Stuff * Manual 3-speed transmissions * Muncie 4-speed Casting Numbers/Decoding/Identification * Powerglide * Turbo Hydramatic 350 * Turbo Hydramatic 400 * 200-4R/700R4 Overdrive * GM Transmission lengths & oil pan * Automatic transmission operating temps * TH350/TH400 Speedometer Gears Frames * Chevelle Frames Trim Tags 60 is the strength rating (less than the 4L80). From 1967 on, the ID number contained the transmission type or plant prefix, Date (coded below), and a shift code. You can find the exact transmission you have. The Muncie four-speed, like the T-10, is a side-loading transmission. Another quick way to identify a Turbo 400 is to look at the kick-down mechanism. First, you must check whether its a manual or automatic transmission. If you have a project car from Chevrolet, Buick, Pontiac, or any other GM brand, youll want to identify the transmission. The Head Casting number is located outside of the Valve Cover in plain site on the Drivers Side. 12. The transmission pan is a wealth of knowledge because it has various inscriptions concerning the transmission. 3845122 is the casting number of the transmission case for the 1955-1957 3 speed transmission for passenger cars and Corvettes. Note the single groove, meaning an M21 close-ratio. The first letter is almost always F since most GM engines were made in Flint, Michigan. The data will help you to identify the transmission system. A manual transmission requires the driver to switch gears manually. Transmissions have RPO numbers, usually beginning with "M". It was phased out of use and superseded by GMs 700R4 starting in 1982. You can use a variety of stock and aftermarket shifters on any of the Muncie tailshaft housings. Borg Warner once again started supplying four speeds to GM in the early 70s with the release of the Super T10. 1976 through 1981 model years. The first letter will be either. Knowing if your transmission is manual or automatic should be basic information. Most transmissions will have a "source serial number" (chassis vin) usually found close to the transmission code. Above is the transmission ID tag on a 1970 Corvette. GM Casting Numbers The Turbo 400 was GMs heavy-duty three-speed transmission used from 1964 to 1990. GM Turbo 200 and 200C: 3 Speed Transmission. Generally found in Chevy & GM trucks, cadilacs and large displacement engined, full size GM rear wheel drive cars. You can identify transmission numbers by checking on the transmission pan. Like Cobalt said, it is very easy to mistake a 6 for an 8 in these castings. and traction is enhanced, you can figure on eventually breaking the transmission. The T-10 four-speed was an evolution of the T-85 three-speed transmission, with both of these transmissions being quite similar in appearance. These grooves are there to indicate the ratios of the gears inside the transmission. Need help to decode Saginaw 4 speed transmission. Nowadays, most drivers are more familiar with automatic cars, and manufacturers mostly use automated transmission systems. Powered by UBB.threads PHP Forum Software 7.7.5. A mechanically robust transmission, it was used in other General Motors vehicles as well. 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. Before you here are the basics of Muncie M20, M21, and M22 four-speed transmissions.
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