See partial VIN stamped on housing as well as the date code on the fluid pan. 2nd and 3rd row seats were optional. You don't have to search the classifieds or a junk pile to find a suitable bellhousing for your Muncie M20, M21, or M22. Of course, that was many years ago. Like I said, the Muncie HD is a lot heavier. S = Saginaw 3-speed A = 68/69 L6 Torque-Drive K = McKinnon 3-speed C = Cleveland Powerglide . The muncie reverse lever is in the extention housing, and the cover has 7 bolts. Identifying the transmission on your project car ensures that you have the right parts and avoid any errors during the restoration process. Cast iron case, believe it is a Saginaw three speed, but not sure. 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). 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. The casting number 3925660 denotes this as a 1968 1970 Muncie with a 1-inch cluster shaft. 1993 and Newer (4L60E), 1980-1991 (AOD) There are not too many gearboxes that can make that claim. 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 1967 on, the ID number contained the transmission type or plant prefix, Date (coded below), and a shift code. In the 1970s, virtually all Muncie four-speeds had 26-spline input shafts. 1969-1986. If you are not sure how to distinguish between an M20, M21, or M22 Muncie, knowing what to look for can be tricky. This decreased helix angle of the gear not only created a stronger gear set, but it also produced a substantial amount of gear whine which is highly noticeable when driving the car. General Motors is an innovator of automatic transmissions, introducing the Hydra-Matic in 1940. GM's goal with the Muncie four-speed was to produce a better shift employing larger synchro cones. There are no members with birthdays on this day. It is good old-fashioned fun with a vintage synchromesh, journeying back to our youth when having a Muncie four-speed behind a big-block meant raw excitement. Transmission identification may be determined by finding the transmission application code in the following tables. 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 Also, the chances of older cars having an intact manual are slim. Found on 76 through 84 models. And finally, if forced to choose between a Muncie or the BorgWarner T-10, it is suggested you choose the Muncie due to its brute strength. The two transmission systems manual and automatic, have different working principles. The casting number 3925660 denotes this as a 1968 - 1970 Muncie with a 1-inch cluster shaft. You can identify transmission numbers by checking on the transmission pan. For example, replacing a Powerglide with a Turbo 350 is an easy swap. The M22 to come later in 1967-'74 is also a close-ratio unit, but much stronger than the M21, with a higher torque capacity. Casting numbers on the case and extension housing. Due to the wide combination of id's, stampings, numbers, etc varied and even GM couldn't keep When you have the two side-by-side it becomes obvious which is which. The SM465 is an outstanding, heavy-duty truck transmission designed and used in , 3/4 and 1+ ton trucks. Need a little help in the ID of a GM 3 speed trans I picked up. Identify General Motors' Four-Speed Transmissions 1 groove: First 2.54, Second 1.84, Third 1.32, Fourth, 1.00 2 grooves: First 3.11, Second Show More Show Less. A = Jan, B = Feb, C = Mar, D = Apr, E = May, H = Jun, K = Jul, M = Aug, P = Sep, R = Oct, S = Nov, T = Dec. GM Turbo 400 TH400 Transmission 3 Speed Transmission. We will safeguard your e-mail and only send content you request. Use the shifter to shift gears and note the number of times it shifts. Muncie transmissions from 1971-'74 have the larger 32-spline output shaft. The Casting Numbers to the right are found just below and to the right of the Distributor on the passenger side. However, classic cars usually have manual transmissions. Build your own custom newsletter with the content you love from Chevy Hardcore, directly to your inbox, absolutely FREE! different casting number, which is 10168588. Steel tag on the passenger side: I don't think we can identify the tranny from that. You can get a guide or chart to help you place your transmission pan. For example, a GM vehicle from before 1967 has an ID tag that looks like C123N. GM 700R4 (4L60) not 4L60E . 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). Comparison images courtesy of Hurst Shifters. 2023 Power Automedia. numbers here that I can prove, so this is a short list. Nov 16, 2011. It is identified easiest by its 375-THM designation cast in the underside of the tail housing. 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. The numbers 3831707 and the shifter linkage being attached with studs and nuts make this a side cover for an early Muncie. A forum community dedicated to hot rod owners and enthusiasts. The M20 and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and close-ratio units. The M-21 has a higher pitch angle on its gear teeth. 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). On the far right is the M22 26-spline input shaft. These grooves were cut into the input shaft so assembly line workers at the plant could easily identify which input shaft should be installed in a particular unit. The bearing bore size was also one year only with a #6207-style input shaft bearing, according to Cangialosi. The output shaft has the code # of 14030874. 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. now = new Date Gm manual transmission identification numbers. Engine Casting Numbers Explained 1954-1962 Chevrolet, Serial Number/Engine Type/Series Designation, On the flat part of the Distributor Deck you will find a stamped Serial Number. The Turbo 400 was GM's heavy-duty three-speed transmission used from 1964 to 1990. Older vehicles are quite different because theres a lot of variety when it comes to transmission systems. Powered by UBB.threads PHP Forum Software 7.7.5. 14. 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. Besides the transmission identification, it also helps to figure out which options was the car ordered with by using a VIN decoder tool. All transmissions with a 26-spline input shaft used a 32-spline output shaft, and all those with a 10-spline input shaft were paired with a 27-spline output shaft. For 1964 and beyond, it rode on a bushing between it and the mainshaft. The 1956 through 1962 Corvettes only used the aluminum versions. In the early 90s, GM rebranded all of its transmissions. The Turbo 350 transmission was prevalent in nearly all GM, rear-wheel-drive cars and trucks through 1984. Youll not only need to hunt for, and hopefully find the tag, but it needs to be free of enough gunk to be legible. Two are early style side covers. Each number in the 17-digit VIN represents specific information about a vehicle. Summit Racing Equipment inventories all kinds of cast-aluminum and steel bellhousings for the Muncie. Report an Issue | General Motors has variety when it comes to automatic transmissions, and some of them have different pan shapes. Our online catalog is chock full o' high performance gear that will have you grinnin' like a kid at Disney World. On the left is the M20 countershaft, which is easily identified by the larger 29-tooth gear. Search transmissions by vehicle's VIN, License Plate, or Year/Make/Model information. These grooves are there to indicate the ratios of the gears inside the transmission. 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. I only put the When it shifts from 1st to 2nd its got a really smooth shift and it puts a smile on your face. Remember, check for a nearly square shape and 13 bolts. MX3 Another Turbo 350 C code. This stamping is usually alpha code indicating the source of the trans followed by several numbers indicating specific month & day the trans was assembled. theYear=now.getYear() Responding to market demand for a three-speed automatic, The Turbo-Hydramatic 350 was introduced in 1969 as a replacement to the Powerglide in Chevrolet cars and trucks with six-cylinder engines or low-horsepower V8 engines. In order to correctly identify a Muncie four-speed transmission, several visual clues are needed, and those cues involve the casting numbers on the case, side cover, and tailshaft. These days, the tag looks like P8E17 (Powerglide= type, 8= 1988, E= month, 17th= day). Here's a typical Muncie gearset consisting of First, Second, and Third gear. There is no leaking coming from the front seals, rear sears or oil pan. 3 speed manual out of a 55.1 Chevy Truck. FORD (336) BORG-WARNER T-10, GM AS-3 (410) *MUNCIE Shaft Identification:. Varying axle ratios were featured on the various gearbox and engine types per the below table. Transmisson Tech Info & Product Instructions. Removal of the front bearing cover is where disassembly begins. The 1964 through 1968 Muncie side covers had a stud coming out of the side cover that secured the linkage arm via a nut. 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. This machined flat area has serial numbers The M22 Rock Crusher used a gearset that features less of an angled-tooth gearing (right). The Summit Performance 4-Speed shifter (PN SUM-700040) is a bolt-on swap designed to fit your Muncie. The M22 was designed as a road race transmission, and the straighter angle of the gear teeth produced less heat and less end-loading of the gears. ~David PS ..I would think pictures of all 3 could help us if you could post some. The Muncie was originally a stronger alternative to the T-10 and Super T-10 because it could take the torque. Muncie 4-speed or TH400 were the only transmission options available. The easiest method of GM automatic transmission identification is to examine the transmission pan. We will safeguard your e-mail and only send content you request. Check through the information for your transmission identification. You can use a variety of stock and aftermarket shifters on any of the Muncie tailshaft housings. 18L165790 The Muncies appearance, design, and operation did not change much during the transmissions use in GM production cars. 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. Powered by, Badges | You can use the transmission ID tag, VIN decoder, transmission pan, and owners manual to identify your transmission system. You don't have any products in your shopping cart. The differential ratio is stamped on the passenger side axle tube. On the THM200-R4 the VIN is stamped onto the housing towards the rear of the pan, on the drivers side. The "kick down" switch locations for the Turbo 400. Just because you've found a 26-spline input shaft does not mean you've found an M22 input shaft, which is made of a stronger alloy. Dave Cruikshank is a lifelong car enthusiast and an editor at Power Automedia. 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This was used in A-body and F-body cars and Corvettes into the early 80s. hey Bob .I wish I could help out with your numbers on the trannys. Some transmissions have a code stamped onto them. following numbers are the month first followed by the day of the month. Vehicles leaving the factory with an axle ratio of 3.55 and numerically lower gears, typically incorporated a wide-ratio transmission. Outside that, you can push in your clutch and hold the brake. While the Chevy four-speed manual transmission was a staple in many muscle cars, even many of the Generals other car models were equipped with a manually operated gear selecting device. Next, carefully raise the vehicle with a jack. Others have a tag rivited to the case. A=M20 B=M21, C=M22). severely powerful (high torque) big-block engines. 1976 through 1981 model years. Jointly developed by Chevy and Buick, it is also known as the CBC (Chevrolet-Buick combined) 350. Identify the Transmission You Have. All rights belong to the entity responsible for the trademark or copyright. Set up the wheel chocks behind the tires so theyre firmly on the ground. Clean the area thoroughly and use a nice bright flashlight. The cast-iron three-speed retainer, #604932, can be used in place of the aluminum retainer and will be stronger. theYear=theYear+1900 - Chassis Vin Number stamping - beginning in 1962. The Turbo 475 was an extra-heavy-duty version and was found in larger trucks from 1971 on. The 4 cylinder models have 4 large cooling holes near the torque converter, while on the "bigger cars" there are no cooling holes. Although the Muncie's bloodline goes way back, this legendary gearbox entered service for the Chevrolet Division in 1963. This one will have a CONveyor Number and beside that The numbers you are looking for are stamped (about 1/4" high) and usually a Letter followed It was phased out of use and superseded by GMs 700R4 starting in 1982. It was standard equipment on large displacement, high-torque engines, and is generally found in trucks, and full-size GM rear-wheel-drive cars. You can check the cars specifications online to determine if it uses a manual or automatic transmission. GM manual transmission identification. It is also a cast iron case. Muncie Transmission Identification. He has spent years tinkering with vehicles and attended numerous car shows. My question is will this direct swap to a '81 with the 3 speed saginaw? 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. . On the THM700-R4 the VIN is either stamped onto a boss behind the bellhousing flange on the passenger side, just above the pan on the drivers side, or just behind the governor cover, stamped vertically where the case meets the tailshaft housing. 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. On the right is the M22 countershaft with 27-teeth. The T-85 three-speed transmission was one result of that merger. On the Turbo 350, the VIN will be stamped on either the drivers side housing (near the shifter), on the right side of the housing just above the pan, or on a boss behind the bell housing flange on the passenger side of the transmission. Note the single groove, meaning an M21 close-ratio. The constants in decoding the trans ID number are the date the transmission was produced. It was a matter of economics when Chevrolet needed a four-speed manual transmission for the Corvette in the mid-1950s. From 1967 on, the ID number contained the transmission type or plant prefix, Date (coded below) and a shift code. From 1971 through the end of production in 1974, the M20 got the 26-spline input shaft. Knowing if your transmission is manual or automatic should be basic information. He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963. 60 is the strength rating (less than the 4L80). Awfully close to a Muncie (3925660). 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. Not only is the diagram below helpful for identification purposes, but is a great visual source to see if you have enough room for a swap you might be contemplating. Note partial VIN stamped at the bottom. 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. Sep 20, 2004 #4 CRAZYREDNECK77 Member Sep 20, 2004 67 The M-22 has "straight cut" gears. While the M21 and M22 did have the same gear ratios, the M22 did utilize a cluster gear with the gear teeth having different tooth angles. The SM465 was made by General Motors from 1968 to 1991. 18. Thank you for working with us. 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. Shown here is the M20 10-spline wide-ratio input shaft and counter gear. Before using any method to find your transmission type, you should find out if its a manual or automatic transmission. 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 right, if we knew what the trannys went to , they could be of help to someone if not only for parts. Pre-67 Example: C213N (C = Cleveland Powerglide, February 13, Night Shift) The Turbo 375 was a version of the transmission used from 1972 through 1976, in small displacement cars. The 3-speeds were just as beefy and robust as their 4-speed counterparts. There are a couple of different debates that typically occur when a bunch of car guys get together. 11. From 1963-'70, the Muncie was fitted with a 27-spline mainshaft and must have the corresponding slip yoke. You can find the serial number on the bottom left of the transmission data plate. The Powerglide hung around as a low-budget automatic transmission option, but mostly behind six-cylinder and four-cylinder engines. 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). 19. If it has a cast-iron case with an aluminum side cover and tail housing, that will mean you have found a Borg Warner. Not a T10 (1304 series); If its iron and has all three shift levers on the side cover, its a Saginaw. There is no real performance potential in the smaller 4.3 version, and it should be avoided or replaced with the larger LT1/LT45.7L engine if high performance is the goal. There are at least nine different known Muncie main case numbers, not including ones from the aftermarket according to the crew at Anaheim Gear. On the THM350, the VIN will be stamped on either the drivers side housing near the shifter, on the right side of the housing just above the pan, or on a boss behind the bellhousing flange on the passenger side of the transmission. You can find the exact transmission you have. And keep in mind that not all will sport these grooves. case. General Motors is an innovator in the automobile industry, and they were one of the early adopters of the automated transmission system. The final digit is the year the engine was made WITHIN I live in Covington, Tennessee and I just had my Monster Transmission installed in my 2001 Dodge Ram and I'm completely happy with it.
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gm 3 speed manual transmission casting number decoder