Cangialosi tells us all M20 and M21 transmissions were produced with both 10- and 26-spline input shafts. Standard Borg Warner H.D. Not only were they both popular transmissions in muscle cars and Corvettes, but many were even used after the muscle car era. The trailing letters denote what the engine was installed in. The 465 is an intellegently designed . We will safeguard your e-mail and only send content you request. The constants in decoding the trans ID number are the date the transmission was produced. 1982 and 1992 THM200-R4 - Used in GM rear wheel drive cars with the 3.8 V6, 305 & 350 Olds and 301 pontiac from 1981 to 1989. 3L80 - The 3L80 is a renamed THM400, used in the early 1990's. During the run of General Motors inclusion of four speeds in their cars, there were three variations possible. Never underestimate the mighty post-war Powerglide. That being said, there was a second, close-ratio version (M22) that was developed to survive duty behind engines with a higher torque output, and was known as the Rock Crusher. This version was offered in high-performance big-block cars starting with the 1965 Corvette. 250 and 292 inline 6-cylinder engines offered, while a 305 V6 was available only in GMC trucks. fileslib. . 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. The center two digits are the day of the month. The main case will sport a seven-digit casting number (found above the US Patent No), which is not a GM part number. When other companies started making automatic transmissions in the 1950s, GM already had four in-house. This stamping is usually alpha code indicating the source of the trans followed by several numbers indicating specific month & day the trans was assembled. 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. YOU DO. 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. If a car came with an axle ratio of 3.73 (or numerically higher), it usually came with a close-ratio transmission. Nov 16, 2011. After 1967, GM switched things up and changed the code structure. Become a VCCA member! Thank you for working with us. 3925658 does not match any casting numbers in my books. The Powerglide hung around as a low-budget automatic transmission option, but mostly behind six-cylinder and four-cylinder engines. 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. When it comes to transmissions, no other company provides this level of commitment to their clients. 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. Youll not only need to hunt for, and hopefully find the tag, but it needs to be free of enough gunk to be legible. CASE: GM 20 3799193 D1162 TAIL: 3707195 COVER: (4 bolt) 3731911 . SECOND TRANSMISSION. Generally able to handle up to 400 foot pounds of torque. The easiest method of GM automatic transmission identification is to examine the transmission pan. Comparison images courtesy of Hurst Shifters. 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. What you will find in your search for the right Muncie four-speed is conflicting information from different sources. The optional 4-speed was a $184.02. If you have a project car from Chevrolet, Buick, Pontiac, or any other GM brand, youll want to identify the transmission. theYear=theYear+1900
In the middle is the M21 countershaft and input shaft. 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. More items related to this product. The iconic Powerglide automatic transmission has Powerglide printed on its transmission pan. 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. Identify the Transmission You Have. Automatic transmission types are generally identified by their pan shape. Transmissions can be identified in the following manner: Casting numbers : Located on the case, extension housing and side cover (manual). 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. (700R4 & 4L60) On the THM400 the VIN is stamped on a machined surface just above the pan on the drivers side. Note the single groove, meaning an M21 close-ratio. That is why we offer multiple ways for you to search for your transmission. Cangialosi explains there were two basic mainshafts produced for the M20, M21, and M22 transmissions (see Input Shaft Identification chart). severely powerful (high torque) big-block engines. The casting number 3857584 tells us that this is a 1966 or 1970 Muncie tailshaft. From 1971 through the end of production in 1974, the M20 got the 26-spline input shaft. While the big-block vs. small-block variable is one that has two groups of passionatefollowers, the other reflects the way in which the driver selects transmission gears. The output shaft has the code # of 14030874. GM 8. duty close ratio" M-22, also known as the "Rock Crusher". Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks. Before 1967, General Motors included extra information such as the plant code, shift code, and date of production on the ID tag. The first and most obvious has to do with the size of a cars engine. It is also a cast iron case. The transmission pan is one of the most precise methods of identifying a transmission. 1976-1987. the years that you narrowed it down to when you deciphered the Casting Numbers to the right. 7. Muncie 4-speed transmissions can be distinguishedvfrom the style of the transmission arm attachment. All rights belong to the entity responsible for the trademark or copyright. makes this job easier. It was used on large displacement, high . This machined flat area has serial numbers
3854728. tailgate or cargo doors. The Saginaw four-speed box is quite similar to both the T-10 and Muncie four-speed transmissions. 2. In 1974, the two-speed box then went to the great scrap heap in the sky. 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. Differentiating is easy, as the Muncie has seven bolts holding the side cover, and the Borg-Warner uses nine. If you are not sure how to distinguish between an M20, M21, or M22 Muncie, knowing what to look for can be tricky. This one will have a CONveyor Number and beside that
Used on large displacement, high torque engines and engines with towing packages. A forum community dedicated to hot rod owners and enthusiasts. GM Turbo 400 TH400 Transmission 3 Speed Transmission. General Transmission Identification. Transmisson Tech Info & Product Instructions. 18. But the other numbers don't match the extension or sidecover casting numbers. Some transmissions have a code stamped onto them. Each number in the 17-digit VIN represents specific information about a vehicle. When properly identifying a Saginaw transmission, the casting numbers are a surefire way to know for certain what youre looking at. The best way to ID the transmission is to count teeth. Today that seems reasonable however $184.02 1965 dollars adjusted to 2015 dollars is a whopping $1,384.93. The right side numbers are 3925658 8338GM NFc4. The 3L80HD would be the THM475 (heavy duty unit). Removal of the front bearing cover is where disassembly begins. 4L80 - An overdrive model of the THM400. However, neither compares to the Muncie in terms of strength. Please check your browser settings or contact your system administrator. The Turbo 400 has a very distinct fluid pan. Powered by UBB.threads PHP Forum Software 7.7.5. The Turbo 350 transmission was prevalent in nearly all GM, rear-wheel-drive cars and trucks through 1984. It's a light duty version of the THM400, has ABSOLUTELY NO RELATION to the THM375B, and was found in 1972 to 1976 full-size cars. Here's a typical Muncie gearset consisting of First, Second, and Third gear. You can check online auto repair websites, as some have free decoders. The final digit is the year the engine was made WITHIN
Remember, check for a nearly square shape and 13 bolts. Manual Trans Reference GM 3, 4, 5 and 6 speeds V24 How to identify chevrolet gmc manual transmissions Use the following information to compare physical description of your Chevrolet or GMC manual transmission in order to identify what model transmission is in your vehicle. You're going to find various combinations of main cases, tailshaft housings, and side covers coupled with variations inside of each case. A = Jan, B = Feb, C = Mar, D = Apr, E = May, H = Jun, K = Jul, M = Aug, P = Sep, R = Oct, S = Nov, T = Dec. 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 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. Hopefully, this guide can help you decipher what gearbox you have located if youre in need of a Chevy four speed, or if you are fortunate enough to happen across one stashed away in a barn somewhere. There were a total of six types. Trust us to steer you in the right direction, when you choose to DIY. For example, the first X will be a Letter from A through L.
Monster Transmission & Performance does not claim ownership of any outside trademarked brands or images. The 4L80E would be the "electronic" model. thoughts? So now that we have given you some insight into identifying the Chevy four-speed transmission, the next time you are scouring the swap meets or local Craigslist ad, youll have a better understanding of what you are looking at, and youll get exactly what you want. case. 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. Tweet Unlike the Turbo 350, instead of a kick down cable, it uses an electrical slide switch, which is controlled by the throttle linkage. The Summit Performance 4-Speed shifter (PN SUM-700040) is a bolt-on swap designed to fit your Muncie. I don't think we can identify the tranny from that. Effective October 21, 1968, an additional letter was added to the plant prefix number to help identify the gear ratios in Muncie transmissions. The problem with checking the owners manual is that a junkyard find wouldnt have one. The SM465 is an outstanding, heavy-duty truck transmission designed and used in , 3/4 and 1+ ton trucks. We want to make your transmission search as simple as possible. THM350 - Medium duty 3 speed trans used from 1969 to 1989, Used in Buick, Olds, Pontiac and Chevrolet cars and Chevy & GMC light trucks until 1987. Generally used in straight and V6 and small block engines. The Head Casting number is located outside of the Valve Cover in plain site on the Drivers Side. The Muncie four-speed was produced in two ratios: the wide ratio (M20) and the close-ratio (M21). Hi. . This patent number, according to Cangialosi, can be found cast into most Muncie four-speed main cases. Chevy also had a Muncie 3 speed that year, but the side cover casting on that one should be 3952646. You can find out if your GM model is automatic by using the same method. How to identify and decode chevrolet manual 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. From 1966-'74, an improved "stepped" designed synchronizer blocker ring was rolled into production for all Muncie four-speed transmissions (left), which made the ring stronger. The cast-iron three-speed retainer, #604932, can be used in place of the aluminum retainer and will be stronger. The Powerglide was Chevrolets main automatic transmission through the mid-1970s. Now, lets explore GM transmission identification, the different methods, and more. These days, the tag looks like P8E17 (Powerglide= type, 8= 1988, E= month, 17th= day). The standard 10-spline input shaft found its way into new Muncie M20 and M21 transmissions from 1971-'74. Use the owners manual to find information such as the transmission pan length, shape, and more. The guys at Anaheim Gear tell us there are seven total Muncie input shaft options. Good, solid, rugged construction makes it a terrific drop-in for around $100. However, finding one of these transmissions now at a swap meet or salvage yard is getting harder and harder. You will have to decipher the numbers on the ID tag in order to properly tell exactly what kind of transmission you have. 2.1Date codes 3GM transmissions, including Muncie M20, M21, M22 4Automatic transmissions 4.1AMC automatic transmissions, 1972-'06 4.2AMC automatic transmissions, 1955-'71 4.3Jeep automatic transmissions, 1971-back 4.4Transmission dimensions 4.4.1Ford 4.4.2MOPAR 4.5Ford automatic transmissions 4.5.13-speed identification 4.5.24-speed identification General Motors has variety when it comes to automatic transmissions, and some of them have different pan shapes. The Turbo 400 has a very distinct fluid pan. We will safeguard your e-mail and only send content you request. 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. 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. However, there were several design upgrades and modifications made during the total production run. box FWIW. 1965 and Newer. Because this mainshaft is larger, you're also going to need larger bushings and seals. The cases offer a broad range of interchangeability. 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 M-20 wide ratio, the M-21 close ratio, and the "Extra heavy Thanks Dec 11, 2012 #2 G Gary S Administrator Lifetime Gold Member Apr 14, 1999 24,823 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. You don't have any products in your shopping cart. On the far right is the M22 26-spline input shaft. 60 is the strength rating (less than the 4L80). Look at the floorboards, and if there are only two pedals, the car is automatic. On modern models, you can tell which type of manual transmission a car has by looking at the top of the gear shifter. Theres a good number of vehicles that make use of both manual and automatic transmissions. now = new Date
Has the casting # of 3925656. Generally used in straight and V6 and small block engines. And keep in mind that not all will sport these grooves. Chevy Hardcore NEWSLETTER - SIGN UP FREE! Powered by, Badges | The M20 and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and close-ratio units. The next set of numbers you will find helpful are on the flat part of the Distributor Deck. The Muncie is made of aluminum, and will not be rusty looking. The 1964 through 1968 Muncie side covers had a stud coming out of the side cover that secured the linkage arm via a nut. 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. The vehicle identification number (VIN) is a unique identifier for each vehicle (VIN). Muncie 4-speed or TH400 were the only transmission options available. The next numbers we need are the ones just below the Starter on the passenger side. The Turbo 375 was modified to accept the Turbo 350 driveshaft yoke. gross weight. Due to the wide combination of id's, stampings, numbers, etc varied and even GM couldn't keep If it starts with an S, you are looking at a three-speed Saginaw. Fodrea's legacy is far-reaching, extending into popular transmissions around to this day, yet most have no idea who he was. Expect to find various combinations out there because these high-performance four-speed transmissions have been thrashed, trashed, and rebuilt through the decades. The length of the unit can also tell you a few things. Muncie (left) Saginaw Jointly developed by Chevy and Buick, it is also known as the CBC (Chevrolet-Buick combined) 350. How to identify and decode chevrolet manual transmissions. New transmission designs came with new, unique pan shapes, and the general shape of the pan often paints a fairly clear picture of which automatic transmission you are dealing with. Others have a tag rivited to the case. Casting Number Notes, 3831707 Early side cover; 1963 1965, 3884685 Early side cover; used with 3857584 tailshaft housing, 3950306 Late side cover no switches, 3952642 Late side cover with transmission controlled spark switch, 3952648 Late side cover with transmission controlled spark switch, 335308 Late side cover with neutral safety switch. The World's Best Chevrolet and GMC Club! 3 Muncie 4 speeds were offered. Varying axle ratios were featured on the various gearbox and engine types per the below table. Shown here is the M20 10-spline wide-ratio input shaft and counter gear. The easiest way of knowing your GM transmission is by using a VIN decoder. 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. According to Koval, the easiest way to identify an automatic transmission, though, is by transmission pan shape. the angle of the gear teeth. If you dont know where to check, the transmission usually stays around the area of the rear tires. NOT every company stands behind their work. You can check the cars specifications online to determine if it uses a manual or automatic transmission. Besides the transmission identification, it also helps to figure out which options was the car ordered with by using a VIN decoder tool. Your HTML, scripts like Google Ads, images/links, go right here. You can also use VIN decoders to identify your transmission. Also, the chances of older cars having an intact manual are slim. The muncie reverse lever is in the extention housing, and the cover has 7 bolts. The easiest method of GM automatic transmission identification is to examine the transmission pan. (1: Chevrolet, 8: 1968, L: Van Nuys, CA, 165790: last 6 digits of VIN). Go here for Chevy Manual Transmission Identification. MX2 Another 350C code. This can add confusion to what you've found. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! There are not too many gearboxes that can make that claim. be noiser (whines or howls almost like a blower, which is why it's called a "rock crusher") Transmission Identification & Decoding. The
3 speed manual out of a 55.1 Chevy Truck. Aavailable in a 3 speed auto or 4 speed manual transmission. The Muncie was used in all high performance applications until the Borg-Warner Second Design Super T-10 began replacing it in 1974. The Turbo 400 is the largest of the GM auto transmissions, but still surprisingly compact in light of the immense power they can handle. There are two significant variations of the Turbo 400. The Casting Numbers to the right are found just below and to the right of the Distributor on the passenger side. style 235 gets better compression numbers with an "848" Head, look for the last three numbers of that Casting Number. Tailshaft housings will vary based on original application. 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. GM's goal with the Muncie four-speed was to produce a better shift employing larger synchro cones. - Assembly Date Code Stamping - can be stamped anywhere The 1963-'65 M20 input shaft will not have grooves. When looking at a Saginaw transmission, the front input shaft will likely have oneor multiple grooves cut around its diameter. Input has 3 rings so it should have the 3.50 first gear. Step-By-Step Birth Of A QA1 Adjustable Racing, Readers Rig: Sterling Diesels Duramax-Powered, What I Learned Today With Jeff Smith Ensuring Wrist Pin, Whipple Is Bringing Gen 5s Together With 3.0L Blower And, Boost Life Made Easy With The Summit Racing Pro LS Turbo, Steer Your Classic Ride Straight With A New CPP Steering, The Malibeast Chevelle Is a Supercharged Street, Dakota Digital Answers Your Setup, Calibration, And Warranty, Kelly Harveys Single-Turbo, LSX-Powered Drag-And-Drive, Saved From The Scrap Pile: Pernell Spohns 1960, SEMA 2022: GEARWRENCH Leveled Up With Distinct Quality Hand, Reignite Your Cat Eye Silverado Headlights With, SEMA 2022: Paragon Corvette Adds Performance Parts To, PRI 2022: FuelTech Talks About The Tech Of The FT700, PRI 2022: Concept Performance Now Offers Aluminum LTR, PRI 2022: Get Locked In With Forgeline Beadlock, Creative Automotion: The Art of Farmtruck &, Randy Bolig The Media Mover And Shaker Behind Chevy, How Ken Lingenfelters Love for Corvettes Benefits So, Shop Tour: Brian Tooley Racing Expands To Be A One-Stop, Shop Tour: Prestige Motorsports Is Your One-Stop Hot Rod, Full Factory Tour: How Edelbrock Makes Its Cast Aluminum, HOLY SHIP!
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