a usually four digit letter/number combination separated like this: X XX X. One more way to identify the Muncie is via stamped codes in the case, which indicate when the transmission was built at Muncie (see How To Read Muncie Build Date Codes chart). The 3L80HD would be the THM475 (heavy duty unit). The Turbo 400 was GMs heavy-duty three-speed transmission used from 1964 to 1990. This code was used for ten years from 1976 to 1986. There are not too many gearboxes that can make that claim. Effective October 21, 1968, an additional letter was added to the plant prefix number to help identify the gear ratios in Muncie transmissions. Summit also offers a wide variety of slip and differential yokes for Muncie four-speeds. Transmission I. D. | Classic Parts Talk This is what "The World's Best Chevrolet Club" is all about! Chevy Hardcore NEWSLETTER - SIGN UP FREE! GM Transmission ID Guide: Powerglide, Turbo 350, And Turbo 400 You don't have any products in your shopping cart. Prior to 1967, transmission ID numbers contained the plant prefix code, month and date of production (expressed numerically), and a shift code (D = Day, N = Night). Shown here is the M20 10-spline wide-ratio input shaft and counter gear. Drivers dont usually have a problem with identifying modern manual 5-speed and 6-speed transmission systems. JavaScript is disabled. 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. 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. How to Identify Your Transmission - OnAllCylinders Search transmissions by vehicle's VIN, License Plate, or Year/Make/Model information. This patent number, according to Cangialosi, can be found cast into most Muncie four-speed main cases. Note partial VIN stamped at the bottom. You can also use VIN decoders to identify your transmission. 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. Gm manual transmission identification numbers - Tesla Community track of what was what, it's best to ID your gearbox visually, taking what is stamped on the 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 Turbo 475 was an extra-heavy-duty version and was found in larger trucks from 1971 on. How to identify and decode chevrolet manual transmissions. Pre-67 Example: C213N - (C = Cleveland Powerglide, February 13, Night Shift) Today that seems reasonable however $184.02 1965 dollars adjusted to 2015 dollars is a whopping $1,384.93. 3-speed from 1966 SS396. The 1969 and later models use a bolt to secure the linkage to the transmission. The main case will sport a seven-digit casting number (found above the US Patent No), which is not a GM part number. Many enthusiasts feel that for a car to be a true muscle car it must have a four-speed transmission. The easiest way of knowing your GM transmission is by using a VIN decoder. than other boxes. Two are early style side covers. Automatic Transmissions Some transmissions may have a code stamped into their case or a tag riveted to them. 10. MX3 Another Turbo 350 C code. A = Jan, B = Feb, C = Mar, D = Apr, E = May, H = Jun, K = Jul, M = Aug, P = Sep, R = Oct, S = Nov, T = Dec. Author: Alan L. Colvin. The next set of numbers you will find helpful are on the flat part of the Distributor Deck. Do you know how to tell the difference between a Saginaw, a T10, and a Muncie four-speed? Tailshaft housings will vary based on original application. Next, carefully raise the vehicle with a jack. The M-22 is distinguished from an M-21 by Quick Decoding - Chevelle Stuff Please check your browser settings or contact your system administrator. Due to this, the box tends to On the right is the small input shaft bearing, which is 1963 only. The transmission pan is a wealth of knowledge because it has various inscriptions concerning the transmission. Number is located on side cover. fileslib. GM's goal with the Muncie four-speed was to produce a better shift employing larger synchro cones. Removal of the front bearing cover is where disassembly begins. WE ARE READY TO SUPPORT YOUMon - Fri 9:00am - 6:00pm EST. 12. It'll be marked 375-THM on the bottom of the tailshaft housing. It also has the numbers "4.3" cast in the block itself, which makes it easy to spot as the smaller 3.74-inch-bore block. The manual 3-speed transmission was standard fare for most of the Chevelle lineup from 1964 thru 1972. Manual transmission systems are straightforward to spot. Muncie 4-speed transmissions can be distinguishedvfrom the style of the transmission arm attachment. The T-85 three-speed transmission was one result of that merger. If you find an M22, you have the ultimate Muncie designed for the high torque of a big-block that will bolt to your small-block. But the other numbers don't match the extension or sidecover casting numbers. Numbers are displayed below, as they appear on the transmissions. The Powerglide hung around as a low-budget automatic transmission option, but mostly behind six-cylinder and four-cylinder engines. THM400 - The THM400 was GM's Heavy-duty 3 speed transmission used from 1964 to 1990. Chevy Hardcore NEWSLETTER - SIGN UP FREE! 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. Check the car flooring, and if theres a clutch pedal, the transmission is manual. very hard to read and often people make the mistake of thinking a '3' is an '8'. 14" X 6" Rally 1 wheels were featured as an option on the 1966 GTO along with the standard 14" X 6" stamped steel . Ford didnt offer its automatic transmission until 1951, and Mopar buyers had to wait until 1954. Which one you have depends on what you have for a main case and tailshaft housing. These days, the tag looks like P8E17 (Powerglide= type, 8= 1988, E= month, 17th= day). Standard Borg Warner H.D. How To Identify Transmission By Vin - MicDot Keep in mind, if you plan to drop one in a vehicle that makes more power than it did when it was stock, you might want to consider going with the Muncie if you plan to beat on it. The right side numbers are 3925658 8338GM NFc4. Depending on how you ordered your muscle car in the 60s and early 70s, you might have even benefitted from the famous Muncie transmission. Although the Muncie's bloodline goes way back, this legendary gearbox entered service for the Chevrolet Division in 1963. The Muncie was used in all high performance applications until the Borg-Warner Second Design Super T-10 began replacing it in 1974. 18L165790 as I can make it) transmission plant prefix list: Chevy Automatic Transmission Identification. The Casting Numbers to the right are found just below and to the right of the Distributor on the passenger side. The M-22 was generally installed behind You can use the transmission ID tag, VIN decoder, transmission pan, and owners manual to identify your transmission system. You can get a guide or chart to help you place your transmission pan. When you find a used four speed, a Saginaw and Borg Warner transmission will likely be flash rusted because of the cast-iron construction. Above is the transmission ID tag on a 1970 Corvette. That is why we offer multiple ways for you to search for your transmission. But, those built between 1963 and 1965 will not have any rings around the input shaft. You can find the exact transmission you have. Powered by UBB.threads PHP Forum Software 7.7.5. All rights reserved. The number of bolts fastened to the pan is a way of being sure of the transmission system. Saginaw 4 speed # 3925656 | NastyZ28.com It also uses the same vacuum modulator as the Turbo 350. Typical Turbo 350 fluid pan. The World's Best Chevrolet and GMC Club! With an old GM 4-speed manual, you have to observe the transmission system side profile. 3952645 shows up as the sidecover casting number for the 1972 Saginaw 3 speed. Thediscussion about whether to use a four-speed or an automatic transmission has been going on for as long as anyone can remember, and we see no end in sight. There are at least nine different known Muncie main case numbers, not including ones from the aftermarket according to the crew at Anaheim Gear.
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