Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Transmissions have RPO numbers, usually beginning with "M". Thank you for working with us. His passion for performance got him noticed by many locals, and he began helping them modify their vehicles. You can also use VIN decoders to identify your transmission. The Turbo 350 transmission was prevalent in nearly all GM, rear-wheel-drive cars and trucks through 1984. NovaResource - Nova Transmission Codes 1969-1986. Casting numbers on the case and extension housing. Author and technician Paul Cangialosi tells us the original U.S. patent for the Muncie four-speed was filed on November 29, 1957, and approved May 7, 1963. That is why we offer multiple ways for you to search for your transmission. Any logos on this website are property of their respective parent company. Apart from numbers, General Motors transmission ID tag has codes. Transmission Identification & Decoding. Outside that, you can push in your clutch and hold the brake. In fact, 1963 is a standalone year because changes in this box came almost immediately for 1964, beginning with the front bearing retainer, which was aluminum for 1963 and became cast-iron in 1964. In 1974, the two-speed box then went to the great scrap heap in the sky. This was used in A-body and F-body cars and Corvettes into the early 80s. On 72-77 vehicles, the switch is located over the accelerator pedal. Still hoping for some casting number identification assistance, if someone is willing to help. GM 700R4 (4L60) not 4L60E . However, neither compares to the Muncie in terms of strength. On the right is the M22 countershaft with 27-teeth. How to identify and decode chevrolet manual transmissions. How to identify chevrolet gmc manual transmissions GM Turbo 200 and 200C: 3 Speed Transmission. Chevrolet Chevy Manual Transmission Identification and Decoding How To Identify Chevy Four-Speed Transmissions The Turbo 475 was an extra-heavy-duty version and was found in larger trucks from 1971 on. The constants in decoding the transmission ID number are the date the transmission was produced. thoughts? Like Cobalt said, it is very easy to mistake a 6 for an 8 in these castings. If you examine the 1966-'70 wide-ratio M20 input shaft, there are two grooves cut amid the 10 splines. NOT every company stands behind their work. We have salvaged more than one Saginaw from cars like the Vega and Monza. The SM465 was made by General Motors from 1968 to 1991. THM700-R4 - 4 Speed transmission used in GM cars and light trucks with the 2.8, 3.1, 4.3, V6, Chevrolet built 305, 350 and 454 engines from 1982 to 1992. 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. Need help to decode Saginaw 4 speed transmission. numbers here that I can prove, so this is a short list. 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). The number of bolts fastened to the pan is a way of being sure of the transmission system. We're transmission experts, recognized by some of the greatest and most notable technicians in the automotive industry. 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 During the run of General Motors inclusion of four speeds in their cars, there were three variations possible. Cangialosi explains there were two basic mainshafts produced for the M20, M21, and M22 transmissions (see Input Shaft Identification chart). The materials used in case construction of a Muncie/Chevy four-speed mean that if you find one of these gear boxes in a shed or barn, the Muncie will probably be smooth and covered in grease and/or oil, while a Borg Warner or Saginaw transmission will usually be coated in a light layer of rust. On the THM400 the VIN is stamped on a machined surface just above the pan on the drivers side. We said almost all Muncie transmissions had a groove(s) around the input shaft, and that is because most close-ratio Muncies will have one ring around the input shaft. The Turbo 400 has a very distinct fluid pan. There are no members with birthdays on this day. If you have a project car from Chevrolet, Buick, Pontiac, or any other GM brand, youll want to identify the transmission. Engine Casting Numbers Explained 1954-1962 Chevrolet The Casting Numbers to the right are found just below and to the right of the Distributor on the passenger side. The output shaft has the code # of 14030874. This is the M21 10-spline input shaft with a single groove and the applicable 27/22/19/17-tooth countershaft. A forum community dedicated to hot rod owners and enthusiasts. Saginaw 4 speed # 3925656 | NastyZ28.com The Saginaw four-speed box is quite similar to both the T-10 and Muncie four-speed transmissions. Basically, GM stamped them anywhere they could find a suitable place in the casting. VCCA members have access to a list of over 50 Technical Advisors who can help you with your car. . The large-bore Muncie came into production in 1964-'65 and became the standard from then on through the end of production in 1974. Transmissions with a suffix of "C" on the end of the type (THM200C) indicate the transmission has a lock up torque converter. Supposing it shifts six times, its a 5-speed system. For 1964 and beyond, it rode on a bushing between it and the mainshaft. Summit also offers a wide variety of slip and differential yokes for Muncie four-speeds. The right side numbers are 3925658 8338GM NFc4. Hopefully, this guide can help you decipher what gearbox you have located if youre in need of a Chevy four speed, or if you are fortunate enough to happen across one stashed away in a barn somewhere. The early GM Hydra-Matic transmission served the 1940-1968 Oldsmobile models. You can use things like the pan material, length, and shape to identify it. Gm manual transmission identification numbers - Tesla Community

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