. Expert advice on car parts, maintenance, and repair. On the left is the M20 countershaft and 10-spline input shaft. 3952645 shows up as the sidecover casting number for the 1972 Saginaw 3 speed. Slide under the car and locate the transmission. General Motors is an innovator in the automobile industry, and they were one of the early adopters of the automated transmission system. GM manual transmission identification. While you can get a lot of information for free in this forum, sometimes the info that you REALLY need is only available from the right person. The Turbo 400 is the largest of the GM auto transmissions, but still surprisingly compact in light of the immense power they can handle. Your HTML, scripts like Google Ads, images/links, go right here. The transmission identification number or source serial number (chassis VIN) is usually located close to the transmission code. These days, the tag looks like P8E17 (Powerglide= type, 8= 1988, E= month, 17th= day). Pre-67 Example: C213N (C = Cleveland Powerglide, February 13, Night Shift) GM Turbo 200 and 200C: 3 Speed Transmission. THM400 - The THM400 was GM's Heavy-duty 3 speed transmission used from 1964 to 1990. But the other numbers don't match the extension or sidecover casting numbers. now = new Date Yes, you can tell what type of transmission from a VIN number. 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. If you've ever looked at a BorgWarner T-10 and a Muncie four-speed and gotten them mixed up, you are not alone because the Muncie (M20, M21, and M22) is a direct descendant of the T-10 according to Cangialosi. In modern cars, you can quickly identify the 6-speed and 5-speed transmission applications. The transmission pan is a wealth of knowledge because it has various inscriptions concerning the transmission. Starting with the 1966 models, the wide ratio versions got two rings around the input shaft, and the M22 input shaft had no rings and looks like a 1963 through 1965 wide-ratio input shaft. The length of the unit can also tell you a few things. The main case will sport a seven-digit casting number (found above the US Patent No), which is not a GM part number. Muncie 4-speed transmissions can be distinguishedvfrom the style of the transmission arm attachment. Cases are either small-bearing (1963) or large-bearing (1964-'74). The casting number 3925660 denotes this as a 1968 1970 Muncie with a 1-inch cluster shaft. 2001 - 2022 Monster Transmission and Performance, All Rights Reserved. There are not too many gearboxes that can make that claim. Muncie M62/M64 3-speed longitudinal transmission made by GM Muncie SM420 transmission 4-speed manual used up to 1967, very similar to sm 465 except small changes to gear ratios and location of reverse. Effective October 21, 1968, an additional letter was added to the plant prefix number to help identify the gear ratios in Muncie transmissions. 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. Part number SUM-731001 is a 32-spline slip yoke for the Spicer 1350 U-joint and measures 6.250-inches long. The output shaft has the code # of 14030874. You can find the exact transmission you have. The Muncie is made of aluminum, and will not be rusty looking. The 17-character number is a form of code that identifies the vehicle's specifications. You don't have any products in your shopping cart. The Head Casting number is located outside of the Valve Cover in plain site on the Drivers Side. You can tell the transmission from the pan shape and how many bolts it has. 3L80 - The 3L80 is a renamed THM400, used in the early 1990's. The additional letter codes as follows: Of course like engines, transmissions come and go over time, so below is the (as complete See partial VIN stamped on housing as well as the date code on the fluid pan. 4L60 means 4 forward speeds, L = longitudily mounted (rear wheel drive). as I can make it) transmission plant prefix list: Chevy Automatic Transmission Identification. Need help to decode Saginaw 4 speed transmission. If you dont know where to check, the transmission usually stays around the area of the rear tires. 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. Joined: Dec 2, 2001 Messages: 26 Location: Midwest City USA. 4JSAToo, Jan 6, 2004 #1. When looking at a Saginaw transmission, the front input shaft will likely have oneor multiple grooves cut around its diameter. Some of these methods are: All the above-listed methods are dependable ways of identifying a cars transmission. It'll be marked 375-THM on the bottom of the tailshaft housing. General Motors used different transmission pan shapes and bolts for its models, so this method requires some knowledge of the pans. It shifts wonderful and I'm delighted to have been dealing with Monster Transmission. 11. 3.55 geared and higher (numerically lower) cars used the wide ratio gearbox. Not only are the Saginaw and Borg Warner side cover and tail housings constructed of different materials, but the reverse shifter arm of a Saginaw is on the side cover while the T10 is located on the tail housing. 3 Muncie 4 speeds were offered. 1991 and Newer If you do happen to stumble across Chevy four-speed at a swap meet, do you know what you are actually looking at? It functions correctly. The large-bore Muncie came into production in 1964-'65 and became the standard from then on through the end of production in 1974. There is no difference other than the name. 0 grooves: First 2.84, Second 2.01, Third 1.34, Fourth, 1.00, 1 groove: First 2.54, Second 1.84, Third 1.44, Fourth, 1.00, 1 groove: First 2.54, Second 1.84, Third 1.32, Fourth, 1.00, 2 grooves: First 3.11, Second 2.20, Third 1.47, Fourth, 1.00, 3 grooves: First 3.50, Second 2.46, Third 1.65, Fourth, 1.00. 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. All rights belong to the entity responsible for the trademark or copyright. A manual transmission requires the driver to switch gears manually. Aavailable in a 3 speed auto or 4 speed manual transmission. 1981-1990. The Muncie four-speed, like the T-10, is a side-loading transmission. The trailing letters denote what the engine was installed in. 1965 and Newer. 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). THM250 - Used in small 4 cylinder cars (Vega, Sunbird, Monza) from 1973 to 1981 and some Nova/Camaro/Chevelle 6 cylinders in 1974 & 75. Some exceptions include the 1970 with either the SS396 or SS454, the 1971 and 1972 SS with the 454 engine where the H.D. While casting numbers are a definite guideline for identification, a quick, somewhat accurate way to quickly identify Muncie transmissions involves the input shafts. The M20 and M21 used a gearset with a more angled tooth design on each gear (left). Looks to be from a 68/9 camaro. 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. 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. Enjoy the forum? The two transmission systems manual and automatic, have different working principles. If you are installing your transmission that was purchased from Monster Transmission, our sales and support staff is here. Basically, GM stamped them anywhere they could find a suitable place in the casting. Not a T10 (1304 series); If its iron and has all three shift levers on the side cover, its a Saginaw. 18L165790 Transmissions can be identified in the following manner: Casting numbers : Located on the case, extension housing and side cover (manual). The easiest method of GM automatic transmission identification is to examine the transmission pan. If you examine the 1966-'70 wide-ratio M20 input shaft, there are two grooves cut amid the 10 splines. This stamping is usually alpha code indicating the source of the trans followed by several numbers indicating specific month & day the trans was assembled. In the early 90s, GM introduced its electronic Hydra-Matic transmission systems. Discussion in '1947-1954' started by Blueflame236, Dec 15, 2012. . X3845157 GM. 15. Generally, in 68-71 vehicles, the switch is located on the carburetor. case. What you will find in your search for the right Muncie four-speed is conflicting information from different sources. Two are early style side covers. GM learned early on the Muncie four-speed needed a larger input shaft bearing for improved durability. The right side numbers are 3925658 8338GM NFc4. The Muncie was originally a stronger alternative to the T-10 and Super T-10 because it could take the torque. Due to this, the box tends to Powerglide transmissions were cast with the word Powerglide along the body, Assembly Date Code Stamping can be stamped anywhere, Chassis VIN Number stamping or source serial number- beginning in 1962. The transmission pan is one of the most precise methods of identifying a transmission. H = Muncie / 3-speed K = McKinnon / 3-speed M = Muncie / 3-speed N = Muncie / 4-speed O = Saginaw / Overdrive P = Muncie / 4-speed M20 . We'll send you the most interesting Chevy Hardcore articles, news, car features, and videos every week. than other boxes. 18. 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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