gm 3 speed manual transmission casting number decoder

Looks to be from a 68/9 camaro. GM 8. Manual transmission systems are straightforward to spot. Four are late model. The easiest way of knowing your GM transmission is by using a VIN decoder. On the right is the small input shaft bearing, which is 1963 only. We said almost all Muncie transmissions had a groove(s) around the input shaft, and that is because most close-ratio Muncies will have one ring around the input shaft. Drivers dont usually have a problem with identifying modern manual 5-speed and 6-speed transmission systems. The Muncie was used in all high performance applications until the Borg-Warner Second Design Super T-10 began replacing it in 1974. The trailing letters denote what the engine was installed in. The SM465 is an outstanding, heavy-duty truck transmission designed and used in , 3/4 and 1+ ton trucks. 3. 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. In modern cars, you can quickly identify the 6-speed and 5-speed transmission applications. Many enthusiasts mistakenly refer to all Muncies as Rock Crushers, and this is just not appropriate. The early GM Hydra-Matic transmission served the 1940-1968 Oldsmobile models. Fodrea's legacy is far-reaching, extending into popular transmissions around to this day, yet most have no idea who he was. The casting number 3925660 denotes this as a 1968 - 1970 Muncie with a 1-inch cluster shaft. The 4L80E would be the "electronic" model. 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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. Even the Muncie has its limitations, but they are significantly higher than the Saginaw or Borg Warner. When you find a used four speed, a Saginaw and Borg Warner transmission will likely be flash rusted because of the cast-iron construction. The casting number 3857584 tells us that this is a 1966 or 1970 Muncie tailshaft. If you have ever heard that the new The Turbo 375 was a version of the transmission used from 1972 through 1976, in small displacement cars. Report an Issue | In 1974, the two-speed box then went to the great scrap heap in the sky. There are no members with birthdays on this day. Chevy also had a Muncie 3 speed that year, but the side cover casting on that one should be 3952646. This early box began its career being placed in the Corvette. 7. Tweet Many GM trannys had the VIN stamped on the maincase on the flange where it attaches to the tailshaft, but some of the later Saginaws had a pad machined into the case just for stamping the number. 3-speed from 1966 SS396. Keep this in mind when you're searching for a Muncie transmission. THM400 - The THM400 was GM's Heavy-duty 3-speed transmission used from 1964 to 1990. 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. You have to decode these simple codes to read and understand the information. There is no leaking coming from the front seals, rear sears or oil pan. But the other numbers don't match the extension or sidecover casting numbers. GM Power Glide 2 Speed Transmission. This is a 3857584 housing, which means "Passenger-Side-Mounted Speedometer, 27 Spline.". It is also a cast iron case. It is identified easiest by its 375-THM designation cast in the underside of the tail housing. 2nd and 3rd row seats were optional. 4. 4L60 - Early 1990's saw the 700R4 renamed to the 4L60, and "electronic" models were named 4L60E. Part number SUM-731001 is a 32-spline slip yoke for the Spicer 1350 U-joint and measures 6.250-inches long. 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. my Saginaw #'s . 3854728. V8 engines included 283 and 327. As a manufacturer, GM also applied numerous transmission systems in their older models. The transmission pan is one of the most precise methods of identifying a transmission. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Use the shifter to shift gears and note the number of times it shifts. Look at the floorboards, and if there are only two pedals, the car is automatic. Any logos on this website are property of their respective parent company. Serif is a seasoned automotive enthusiast with a passion for cars. Trust us to steer you in the right direction, when you choose to DIY. 60 is the strength rating (less than the 4L80). Randy Bolig has been working on cars and has been involved in the hobby ever since he bought his first car when he was only 14 years old. Note partial VIN stamped at the bottom. First, you must check whether its a manual or automatic transmission. Finding the ID tag can be extremely difficult on the Turbo 35o particularly because, its probably been lost. A little engine degreaser and a wire brush often Pure dumb luck will lead you to a completely unmolested Muncie. You don't have any products in your shopping cart. The M-20 wide ratio, the M-21 close ratio, and the "Extra heavy You cant simply look at your classic car and identify the type of transmission it uses. Outside that, you can push in your clutch and hold the brake. Muncie (left) Saginaw Main case#3925656 Extension#3925658 Side cover#6261886 also has a date 11-13-78 or 11-13-70 hard to make out . 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. 250 and 292 inline 6-cylinder engines offered, while a 305 V6 was available only in GMC trucks. 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 have salvaged more than one Saginaw from cars like the Vega and Monza. Casting is located above side cover, on trans. Ford didnt offer its automatic transmission until 1951, and Mopar buyers had to wait until 1954. Powered by, Badges | I only put the 1981-1990. Used on large displacement, high torque engines and engines with towing packages. Whether youre trying to repair your transmission or rebuilding a project car, its crucial to identify the transmission type. theYear=now.getYear() 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. Joined: Dec 2, 2001 Messages: 26 Location: Midwest City USA. Basically, GM stamped them anywhere they could find a suitable place in the casting. track of what was what, it's best to ID your gearbox visually, taking what is stamped on the Muncie Transmission Identification. Did you know that there are various models that were used in various cars? 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. If it has a cast-iron case with an aluminum side cover and tail housing, that will mean you have found a Borg Warner. Further Muncie identification Off of the left side of trans: GM 3845122 H254 Thanks. This one will have a CONveyor Number and beside that style 235 gets better compression numbers with an "848" Head, look for the last three numbers of that Casting Number. The 26-spline input shaft yields greater torque capacity via the number of teeth and greater surface area. 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. Sep 20, 2004 #4 CRAZYREDNECK77 Member Sep 20, 2004 67 Go here for Chevy Manual Transmission Identification. (on manual trans). Lets take a brief look at the backstory and origins of each transmission, and how you can visually identify them as well as locate ID tags and identification numbers. Comparison images courtesy of Hurst Shifters. 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. The plant code was a prefix, while the production date had a numerical value. 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. New Process Gear NP435 - 4-speed longitudinal transmission used in a select handful of 67-72 GM pickups However, classic cars usually have manual transmissions. If a car came with an axle ratio of 3.73 (or numerically higher), it usually came with a close-ratio transmission. Anything after that time period will say US Patent No 3088336. A forum community dedicated to hot rod owners and enthusiasts. Turbo 400 is the biggest, Turbo 350s and Powerglides smaller. According to Cangialosi, two companies, Borg and Beck and Warner Gear, merged in 1928 to form BorgWarner. Tailshaft housings will vary based on original application. More items related to this product. Enjoy the forum? Show More Show Less. S = Saginaw 3-speed A = 68/69 L6 Torque-Drive K = McKinnon 3-speed C = Cleveland Powerglide . The Head Casting number is located outside of the Valve Cover in plain site on the Drivers Side. The Turbo 400 has a very distinct fluid pan. From complete engines, to torque converters to Monster in a Box, we've got all your HP needs covered. Typical Turbo 350 fluid pan. Sep 23, 2019. There are six known Muncie side covers. box FWIW. The Borg Warner has a 9 bolt cover. thoughts? 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. Numbers are displayed below, as they appear on the transmissions. In 1974, the two-speed box then went to the great scrap heap in the sky. You can use the transmission ID tag, VIN decoder, transmission pan, and owners manual to identify your transmission system. Performance parts such as Hurst shifters were just as readily available for 3-speeds as with 4-speeds. The Turbo 350 quickly became known for its strength, versatility, and compactness. A manual transmission requires the driver to switch gears manually. possible Letters for the last ones are explained in the chart below. 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. The transmission identification number or source serial number (chassis VIN) is usually located close to the transmission code. We are grateful for the fact that Monster Transmission has gone BEYOND and we will continue to be the best publicity that you will every have.. On the THM200-R4 the VIN is stamped onto the housing towards the rear of the pan, on the drivers side. the years that you narrowed it down to when you deciphered the Casting Numbers to the right. There is no difference other than the name. if (theYear < 1900) You can also use VIN decoders to identify your transmission. This machined flat area has serial numbers The 1963-'65 M20 input shaft will not have grooves. - Date Casting Codes All rights reserved. The output shaft has the code # of 14030874. The best way to ID the transmission is to count teeth. Clean the area thoroughly and use a nice bright 1969-1986. 1962-1973. Hi. 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. 1991 and Newer From left to right are the three basic Muncie input shaft/countershaft combinations. 8. Steel tag on the passenger side: Casting numbers on the case and extension housing. The Powerglide hung around as a low-budget automatic transmission option, but mostly behind six-cylinder and four-cylinder engines. Some exceptions include the 1970 with either the SS396 or SS454, the 1971 and 1972 SS with the 454 engine where the H.D. I have four transmissions, which I need to identify, before I can proceed. Generally used in straight and V6 and small block engines. Need help to decode Saginaw 4 speed transmission. Manufactured from 76 through 81. Each number in the 17-digit VIN represents specific information about a vehicle. If the case and side cover are made of cast iron, that would make it a Saginaw transmission. following numbers are the month first followed by the day of the month. CASE: GM 20 3799193 D1162 TAIL: 3707195 COVER: (4 bolt) 3731911 . The . (center) Borg Warner (right). Besides the transmission identification, it also helps to figure out which options was the car ordered with by using a VIN decoder tool. The "kick down" switch locations for the Turbo 400. The one on the right is an aluminum-case Powerglide. 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. Nowadays, most drivers are more familiar with automatic cars, and manufacturers mostly use automated transmission systems. YOU DO. These days, the tag looks like P8E17 (Powerglide= type, 8= 1988, E= month, 17th= day). Other than the shape of the fluid pan, another key way to identify the Turbo 350 is by the vacuum modulator. The transmission underwent little change, the major difference was a switch from cast iron to an aluminum casting in 1963. The 17-character number is a form of code that identifies the vehicle's specifications. He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963 . 3952645 shows up as the sidecover casting number for the 1972 Saginaw 3 speed. If you have a project car from Chevrolet, Buick, Pontiac, or any other GM brand, youll want to identify the transmission. 13. If a car came with an axle ratio of 3.73 (or numerically higher), it usually came with a close-ratio transmission. You might have trouble observing the system if the vehicle has an installed gearbox. The numbers you are looking for are stamped (about 1/4" high) and usually a Letter followed THM200 - Light duty, "metric" 3 speed transmission. General Motors has several transmissions, and they can be challenging to identify. Dave loves music, design, tech, current events, and fitness. From 1950-1973, most GM divisions used the iconic Powerglide transmission. Measure the pan and examine the shape. The best way to identify a GM automatic transmission is by observing the transmission pan. General Transmission Identification. THM250 - Used in small 4 cylinder cars (Vega, Sunbird, Monza) from 1973 to 1981 and some Nova/Camaro/Chevelle 6 cylinders in 1974 & 75. 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. It shifts wonderful and I'm delighted to have been dealing with Monster Transmission. GM Turbo 350 and 350C (TH350 Transmission) 3 Speed Transmission. On the left is the M20 countershaft, which is easily identified by the larger 29-tooth gear. 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 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. 1976-1987. MX3 Another Turbo 350 C code. The M20 and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and close-ratio units. 4L80 - An overdrive model of the THM400. Use the shifter to shift gears and note the number of times it shifts. You need to look . Generally able to handle up to 400 foot pounds of torque. They are notoriously WinCon Member. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. 3.55 geared and higher (numerically lower) cars used the wide ratio gearbox. Build your own custom newsletter with the content you love from Chevy Hardcore, directly to your inbox, absolutely FREE! However, there were several design upgrades and modifications made during the total production run. This is a 4 speed, overdrive unit. You can find out if your GM model is automatic by using the same method. In the 1970s, virtually all Muncie four-speeds had 26-spline input shafts. 5. Knowledge of your cars transmission system is helpful during repairs and car restoration projects. 17. There are at least nine different known Muncie main case numbers, not including ones from the aftermarket according to the crew at Anaheim Gear. I definitely recommend a look at these transmissions, you've got to have a look. The additional letter codes as follows: Of course like engines, transmissions come and go over time, so below is the (as complete Cangialosi explains there were two basic mainshafts produced for the M20, M21, and M22 transmissions (see Input Shaft Identification chart). 16. The M-22 has "straight cut" gears. The M22 Rock Crusher would come later to accommodate the heavy twist of Chevrolet's big-blocks in the mid-1960s. Jointly developed by Chevy and Buick, it is also known as the CBC (Chevrolet-Buick combined) 350. On the right is the M22 countershaft with 27-teeth. 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). $750.00 Input has 3 rings so it should have the 3.50 first gear. "Almost all have their own shape and pan bolt design," Koval said. Before 1967, General Motors included extra information such as the plant code, shift code, and date of production on the ID tag. The 26-spline input shaft came into production later in the 1970s for the M20 and M21. Part of the problem with GM 4-speed systems is that theres a lot of variety. 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. Due to this, the box tends to Borg Warner once again started supplying four speeds to GM in the early 70s with the release of the Super T10. now = new Date Remove the side cover and forks for a look at the geartrain. 3845122 is the casting number of the transmission case for the 1955-1957 3 speed transmission for passenger cars and Corvettes. A = Jan, B = Feb, C = Mar, D = Apr, E = May, H = Jun, K = Jul, M = Aug, P = Sep, R = Oct, S = Nov, T = Dec. This two-speed box thrives after 71 years and still sees use in motorsports and classic cars. If you dont know where to check, the transmission usually stays around the area of the rear tires. The Example: 19N500001. Main case casting numbers (when looking at the passenger side these numbers are upside down) 6273262, tail shaft housing casting numbers 3968035, Shifter cover casting numbers GM1 3952646. 2023 Power Automedia. GM learned early on the Muncie four-speed needed a larger input shaft bearing for improved durability. The cookie settings on this website are set to 'allow all cookies' to give you the very best experience. Good, solid, rugged construction makes it a terrific drop-in for around $100. 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. 2023 Power Automedia. We will safeguard your e-mail and only send content you request. Author: Alan L. Colvin. Transmission Identification & Decoding. Because this mainshaft is larger, you're also going to need larger bushings and seals. These classic GM models have different complex applications under manual transmission and automatic transmission. First came the Borg-Warner T10 beginning in the late 50s. After this guide, you should be able to understand and identify the transmission on both old and new GM models. Add to quote; Share Only show this user. tailgate or cargo doors. The constants in decoding the transmission ID number are the date the transmission was produced. When it comes to transmissions, no other company provides this level of commitment to their clients. This frees up the geartrain. When you have the two side-by-side it becomes obvious which is which. Has the casting # of 3925656. Not only were they both popular transmissions in muscle cars and Corvettes, but many were even used after the muscle car era. This modulator is stationed at the transmissions side, and there will be a vacuum line connected to it. The basic design and operation theory of the gearbox changed little during that time, though several design upgrades and modifications were made during the total production run. Because the Muncie has so much in common with the T-10 and even similar Saginaw boxes, it is easy to get this guy mixed up with non-Muncie units. 3925658 does not match any casting numbers in my books. They created a standardized naming system across the product line and changed the name of the Turbo 400 to 3L80. Muncie transmissions from 1971-'74 have the larger 32-spline output shaft. A=M20 B=M21, C=M22). These numbers can be found on the transmission case, and the first letter in this series of numbers is going to tell you exactly which Saginaw transmission you are looking at. 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. Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks. Generally, in 68-71 vehicles, the switch is located on the carburetor. The Muncie has probably been the most popular transmission among the hot rodding set since its inception in 1963. You don't have to search the classifieds or a junk pile to find a suitable bellhousing for your Muncie M20, M21, or M22. It is widely known as one of the best automatic transmissions ever built. You can find the exact transmission you have. Aavailable in a 3 speed auto or 4 speed manual transmission. 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During the run of General Motors inclusion of four speeds in their cars, there were three variations possible. Most transmissions will have a "source serial number" (chassis vin) usually found close to the transmission code. Its useful to know the trim of your car so you can easily determine the transmission type. This list includes some GM transmissions. Do you know how to tell the difference between a Saginaw, a T10, and a Muncie four-speed? 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. The M22 Rock Crusher used a gearset that features less of an angled-tooth gearing (right). If you prefer official decoders, you can check the National Highway Traffic Safety Administrations website. THM200-R4 - Used in GM rear wheel drive cars with the 3.8 V6, 305 & 350 Olds and 301 pontiac from 1981 to 1989. The SM465 was made by General Motors from 1968 to 1991. With an old GM 4-speed manual, you have to observe the transmission system side profile. Afterward, you can count the bolts securing the pan. The Turbo 350 transmission was prevalent in nearly all GM, rear-wheel-drive cars and trucks through 1984. 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. VCCA members have access to a list of over 50 Technical Advisors who can help you with your car. Transmission block casting number R 7 T 28 GM number 3890564 Martinius. Its case is essentially smooth. Like Cobalt said, it is very easy to mistake a 6 for an 8 in these castings. 9. The numbers stamped below the shifter cover are M3E07A. This is when you have to remove the side cover to see what's inside. 3L80 stands for three gears, longitudinal mount (rear-wheel drive), and the 80 signifies that it can handle 8,000 lbs. The length of the unit can also tell you a few things. M38 Standard Turbo 350 manufactured from 1976 to 1981. You can check the cars specifications online to determine if it uses a manual or automatic transmission. 1993 and Newer (4L60E), 1980-1991 (AOD) There is also a fine-tooth 26-spline input shaft employed from 1971-'74. Saginaw 3 speeds were built in both Saginaw, Michigan & Munchie, Indiana. If you do happen to stumble across Chevy four-speed at a swap meet, do you know what you are actually looking at? Use the following information to compare physical description of your Chevrolet or GMC manual transmission in order to identify what model transmission is, MySpace !function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs"); Once you identify the pan, count the number of pan bolts for confirmation. Powered by UBB.threads PHP Forum Software 7.7.5. The center two digits are the day of the month. 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. Notice: Any comments posted herein do not necessarily reflect the official position of the VCCA.

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