Casting Number Year Notes, 3831704 1963 7/8-inch cluster, small bearing, 3839606 1963 1964 7/8-inch cluster, 3851325 1964 1965 7/8-inch cluster, 3864848 1965 7/8-inch cluster, 3885010 1965 1967 1-inch cluster, 3925660 1968 1970 1-inch cluster, 3925661 1970 1974 1-inch cluster, Casting Year Notes, 3831731 1963 Thin fin tailshaft, drivers side speedometer, 27 spline, 3846429 1963 Thin fin tailshaft, drivers side speedometer, 27 spline, 3846429 1963 1965 Thick fintailshaft, drivers side speedometer, 27 spline, 9779246 1964 1965 Pontiac Catalina long tailshaft, passengers side speedometer, 27 spline, 3857584 1966 1970 Passengers side speedometer, 27 spline, 3978764 1970 1974 Passengers side speedometer, 32 spline. Also, the chances of older cars having an intact manual are slim. Four are late model. 16. The The Turbo 400 was GM's heavy-duty three-speed transmission used from 1964 to 1990. GM Casting Numbers The 400 transmission has a main case of cast-aluminum alloy with a length of 24-3/8-inches long. THM400 - The THM400 was GM's Heavy-duty 3-speed transmission used from 1964 to 1990. It functions correctly. Download Gm manual transmission identification numbers, Read Online Gm manual transmission identification numbers, http://virtual-village.ning.com/photo/albums/pairing-apple-watch-i-icon-user-manual-guide, https://elimuspace.com/?post_type=dwqa-question&p=31547, https://smkn4malang.sch.id/?post_type=dwqa-question&p=28056, http://teslacommunity.com/photo/albums/nice-pancreatitis-guidelines#.Y3QvpNtByNQ, http://teslacommunity.com/photo/albums/kidde-carbon-monoxide-detector-installation-instructions#.Y3QvTdtByNQ, http://teslacommunity.com/photo/albums/barista-handbook-pdf#.Y3Qv8NtByNQ, http://teslacommunity.com/photo/albums/secadora-mabe-9-kilos-manual#.Y3QvQNtByNQ. From 1963-'70, the Muncie was fitted with a 27-spline mainshaft and must have the corresponding slip yoke. General Motors used different transmission pan shapes and bolts for its models, so this method requires some knowledge of the pans. The M-22 was generally installed behind Main cases manufactured prior to May 7, 1963, will say Patent Pending. The Turbo 475 was an extra-heavy-duty version and was found in larger trucks from 1971 on. Performance parts such as Hurst shifters were just as readily available for 3-speeds as with 4-speeds. The Turbo 350 transmission was prevalent in nearly all GM, rear-wheel-drive cars and trucks through 1984. Note partial VIN stamped at the bottom. We'll send you the most interesting Chevy Hardcore articles, news, car features, and videos every week. It'll be marked 375-THM on the bottom of the tailshaft 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. 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. Outside that, you can push in your clutch and hold the brake. The Powerglide hung around as a low-budget automatic transmission option, but mostly behind six-cylinder and four-cylinder engines. 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. transmission identification confusion | Chevy Tri Five Forum The vacuum modulator is also a way of identifying GM transmission type after checking the pan and counting the bolts. 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. You can find the serial number on the bottom left of the transmission data plate. Muncie (left) Saginaw 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. The additional letter codes as follows: Of course like engines, transmissions come and go over time, so below is the (as complete The NHTSA has some VIN check tools that can assist in identifying transmission types. 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. 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 two transmission systems manual and automatic, have different working principles. Use the shifter to shift gears and note the number of times it shifts. Basically, GM stamped them anywhere they could find a suitable place in the casting. Powered by UBB.threads PHP Forum Software 7.7.5. Its useful to know the trim of your car so you can easily determine the transmission type. Serif is a seasoned automotive enthusiast with a passion for cars. Apart from numbers, General Motors transmission ID tag has codes. Muncie transmissions also tend to get performance improvements such as a gear ratio change and stronger internal parts. a usually four digit letter/number combination separated like this: X XX X. 4. We need to make note that the early Muncie transmissions offered between 1963 and 1965 utilized a 7/8-inch countershaft in the cluster gear, and those manufactured between 1966 and 1974 used a 1-inch diameter shaft. Pre-67 Example: C213N - (C = Cleveland Powerglide, February 13, Night Shift) Our online catalog is chock full o' high performance gear that will have you grinnin' like a kid at Disney World.
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