THM250 - Used in small 4 cylinder cars (Vega, Sunbird, Monza) from 1973 to 1981 and some Nova/Camaro/Chevelle 6 cylinders in 1974 & 75. Transmissions have RPO numbers, usually beginning with "M". GM Manual Transmission Identification? | Hot Rod Forum So it's definitely something you want. You need to look . The 3-speeds were just as beefy and robust as their 4-speed counterparts. Gm manual transmission identification numbers. The Muncie utilized seven different input shafts. If you have a 1963 Muncie that needs an input shaft bearing retainer, all is not lost if you can't find the 1963 aluminum bearing retainer. Guide to Muncie M20, M21, and M22 Four-Speed Transmissions item 2 Restored GM Saginaw 3 Speed Manual Transmission 10 x 27 Select From 4 Ratios Restored GM Saginaw 3 Speed Manual Transmission 10 x 27 Select From 4 Ratios. On modern models, you can tell which type of manual transmission a car has by looking at the top of the gear shifter. The next set of numbers you will find helpful are on the flat part of the Distributor Deck. The casting number 3925660 denotes this as a 1968 1970 Muncie with a 1-inch cluster shaft. List of GM transmissions - Wikipedia This is a 4 speed, overdrive unit. The Turbo 375 was modified to accept the Turbo 350 driveshaft yoke. and will have no numbers stamped on that deck. Its case is essentially smooth. 691747 OR 591747. Identify General Motors' Four-Speed Transmissions 1 groove: First 2.54, Second 1.84, Third 1.32, Fourth, 1.00 2 grooves: First 3.11, Second Many GM trannys had the VIN stamped on the maincase on the flange where it attaches to the tailshaft, but some of the later Saginaws had a pad machined into the case just for stamping the number. This decreased helix angle of the gear not only created a stronger gear set, but it also produced a substantial amount of gear whine which is highly noticeable when driving the car. Responding to market demand for a three-speed automatic, The Turbo-Hydramatic 350 was introduced in 1969 as a replacement to the Powerglide in Chevrolet cars and trucks with six-cylinder engines or low-horsepower V8 engines. The vacuum modulator is also a way of identifying GM transmission type after checking the pan and counting the bolts. Images courtesy chevelles.com. Some of these methods are: All the above-listed methods are dependable ways of identifying a cars transmission.
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