FIRST TRANSMISSION. The early production Muncie four-speed case is the small-bore unit and can be identified by the GM casting number 3831704 (see Muncie M20/M21/M22 Main Case Identification chart). Above is the transmission ID tag on a 1970 Corvette. 1976-1987. Vehicles leaving the factory with an axle ratio of 3.55 and numerically lower gears, typically incorporated a wide-ratio transmission. The Muncie utilized seven different input shafts. How To Identify Transmission By Vin - MicDot If the gear shifts five times, its a 4-speed transmission. theYear=theYear+1900 May 31, 2006. If it has a cast-iron case with an aluminum side cover and tail housing, that will mean you have found a Borg Warner. The Turbo 350 transmission was prevalent in nearly all GM, rear-wheel-drive cars and trucks through 1984. All rights belong to the entity responsible for the trademark or copyright. More items related to this product. This frees up the geartrain. Please click Accept Cookies to continue to use the site. There are two significant variations of the Turbo 400. Due to the wide combination of id's, stampings, numbers, etc varied and even GM couldn't keep Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Today that seems reasonable however $184.02 1965 dollars adjusted to 2015 dollars is a whopping $1,384.93. The Muncie 4-speed transmission was used with many different GM models and engine combinations from 1963-1974. From 1971 through the end of production in 1974, the M20 got the 26-spline input shaft. The output shaft has the code # of 14030874. Glean the basics and use them in your research. Example: 19N500001. stamped into it. Turbo 400 is the biggest, Turbo 350s and Powerglides smaller. However, finding one of these transmissions now at a swap meet or salvage yard is getting harder and harder. Here's another view of the M22's input shaft and countershaft. The 26-spline input shaft yields greater torque capacity via the number of teeth and greater surface area. SECOND TRANSMISSION. 4L60 means 4 forward speeds, L = longitudily mounted (rear wheel drive). 9. GM Manual Transmission Identification? | Hot Rod Forum Clean the area thoroughly and use a nice bright flashlight. Transmissions available: 3 Speed manual, 3 Speed manual with overdrive on 1/2 ton only, 4 Speed manual and two automatics; Powerglide and Turbo Hydra-matic. General Motors has several transmissions, and they can be challenging to identify. From 1967 on, the ID number contained the transmission type or plant prefix, Date (coded below), and a shift code. Performance parts such as Hurst shifters were just as readily available for 3-speeds as with 4-speeds. Good, solid, rugged construction makes it a terrific drop-in for around $100. Due to this, the box tends to My question is will this direct swap to a '81 with the 3 speed saginaw? A = Jan, B = Feb, C = Mar, D = Apr, E = May, H = Jun, K = Jul, M = Aug, P = Sep, R = Oct, S = Nov, T = Dec. The Muncie four-speed, like the T-10, is a side-loading transmission. The Turbo 400 has a very distinct fluid pan. If you have a project car from Chevrolet, Buick, Pontiac, or any other GM brand, youll want to identify the transmission. 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. 11. Anything after that time period will say US Patent No 3088336. I promise you that the next transmission I have to replace or any other person I hear of needing a transmission I will be heavily promoting Monster Transmission and tell them that I personally use Monster Transmission. However, neither compares to the Muncie in terms of strength. THM200 - Light duty, "metric" 3 speed transmission. Transmissions with a suffix of "C" on the end of the type (THM200C) indicate the transmission has a lock up torque converter.