Need a little help in the ID of a GM 3 speed trans I picked up. However, finding one of these transmissions now at a swap meet or salvage yard is getting harder and harder. All rights belong to the entity responsible for the trademark or copyright. 691747 OR 591747. Finding the ID tag can be extremely difficult on the Turbo 35o particularly because, its probably been lost. Nowadays, most drivers are more familiar with automatic cars, and manufacturers mostly use automated transmission systems. The length of the unit can also tell you a few things. 2. Become a VCCA member! 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. The one on the right is an aluminum-case Powerglide. When looking at a Saginaw transmission, the front input shaft will likely have oneor multiple grooves cut around its diameter. 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. 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. 18L165790 You can find out from the specifications or by checking the foot pedals. NOT every company stands behind their work. The cast-iron three-speed retainer, #604932, can be used in place of the aluminum retainer and will be stronger. You can find the source serial number near the transmission code. 1965 and Newer. 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. 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. (C: Chevrolet, D: 327, 68: 1968, 315953: sequential production number), Serial number stamped on the case, above the oil pan, driver side: When it comes to transmissions, no other company provides this level of commitment to their clients. Outside that, you can push in your clutch and hold the brake. 1993 and Newer (4L60E), 1980-1991 (AOD) The casting number 3925660 denotes this as a 1968 1970 Muncie with a 1-inch cluster shaft. 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. A mechanically robust transmission, it was used in other General Motors vehicles as well. This is an M21 with 10-spline input shaft and cast-iron bearing retainer. 19. For 1964 and beyond, it rode on a bushing between it and the mainshaft. . But in non-performance applications, they were still a good Chevy four-speed transmission. THM375B - This trans is identical to the THM350, but is considered a heavier duty transmission. Its case is essentially smooth. GM 700R4 (4L60) not 4L60E . For a better experience, please enable JavaScript in your browser before proceeding. You can check online auto repair websites, as some have free decoders. the angle of the gear teeth. Before you here are the basics of Muncie M20, M21, and M22 four-speed transmissions. There are no members with birthdays on this day. The transmission identification number or source serial number (chassis VIN) is usually located close to the transmission 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. Clean the area thoroughly and use a nice bright flashlight. Basically, GM stamped them anywhere they could find a suitable place in the casting. These grooves are there to indicate the ratios of the gears inside the transmission. 1. We'll send you the most interesting Chevy Hardcore articles, news, car features, and videos every week. All Prices are in USD. Never underestimate the mighty post-war Powerglide. The Powerglide on the left is a cast-iron unit from a 1958-62 Chevrolet. You can use the transmission ID tag, VIN decoder, transmission pan, and owners manual to identify your transmission system. 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. Show More Show Less. The best way to identify a GM automatic transmission is by observing the transmission pan. 3925658 does not match any casting numbers in my books. 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. Dave Cruikshank is a lifelong car enthusiast and an editor at Power Automedia. It was a matter of economics when Chevrolet needed a four-speed manual transmission for the Corvette in the mid-1950s. If you examine the 1966-'70 wide-ratio M20 input shaft, there are two grooves cut amid the 10 splines. You need to look . Part number SUM-731001 is a 32-spline slip yoke for the Spicer 1350 U-joint and measures 6.250-inches long. On the left is the M20 countershaft and 10-spline input shaft. The next set of numbers you will find helpful are on the flat part of the Distributor Deck. MV4 This code identifies your turbo 350 as a C model, which had a locking torque converter. The numbers stamped below the shifter cover are M3E07A. Some GM brand models even have different transmission pan shapes and transmission types for different years. 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. JavaScript is disabled. Found on 76 through 84 models. Not a T10 (1304 series); If its iron and has all three shift levers on the side cover, its a Saginaw. When other companies started making automatic transmissions in the 1950s, GM already had four in-house. flashlight. On modern models, you can tell which type of manual transmission a car has by looking at the top of the gear shifter. This is a 4 speed, overdrive unit. 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. The Turbo 400 is the largest of the GM auto transmissions, but still surprisingly compact in light of the immense power they can handle. According to Cangialosi, GM took the basic T-10 design and beefed it up to conceive the Muncie M20 and M21 four-speed transmissions, which arrived in 1963. From 1967 on, the ID number contained the transmission type or plant prefix, Date (coded below), and a shift code. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 5. 1982 and 1992 The M22 Rock Crusher would come later to accommodate the heavy twist of Chevrolet's big-blocks in the mid-1960s. More items related to this product. The Powerglide was Chevrolets main automatic transmission through the mid-1970s. case. my Saginaw #'s . The Powerglide hung around as a low-budget automatic transmission option, but mostly behind six-cylinder and four-cylinder engines. In 1974, the two-speed box then went to the great scrap heap in the sky. YOU DO. 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). The classic Muncie four-speed transmission in all its many forms generally looks like this (this one provided by Anaheim Gear), though applications will vary in appearance. On the far right is the M22 26-spline input shaft. The close ratio gearboxs generally came with 3.73+ gear ratio'ed cars. You don't have any products in your shopping cart. You can tell the transmission from the pan shape and how many bolts it has. In modern cars, you can quickly identify the 6-speed and 5-speed transmission applications. 250 and 292 inline 6-cylinder engines offered, while a 305 V6 was available only in GMC trucks. 4. 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). You're going to find various combinations of main cases, tailshaft housings, and side covers coupled with variations inside of each case. The Turbo 350 transmission was prevalent in nearly all GM, rear-wheel-drive cars and trucks through 1984. The 400 transmission has a main case of cast-aluminum alloy with a length of 24-3/8-inches long. The Fora platform includes forum software by XenForo. You can find the assembly date code, casting number, and source serial number for vehicles GM manufactured after 1961. That the Muncie has much in common with the T-10 is no accident. Knowing if your transmission is manual or automatic should be basic information. Typical Turbo 350 fluid pan. Almost all Muncie transmissions were delivered with a groove(s) on the input shaft and counter gear. Thank you for working with us. Pure dumb luck will lead you to a completely unmolested Muncie. It'll be marked 375-THM on the bottom of the tailshaft housing. Performance parts such as Hurst shifters were just as readily available for 3-speeds as with 4-speeds. Here's another view of the M22's input shaft and countershaft. 1991 and Newer Notice: Any comments posted herein do not necessarily reflect the official position of the VCCA. If you are installing your transmission that was purchased from Monster Transmission, our sales and support staff is here. This one will have a CONveyor Number and beside that Here's a typical Muncie gearset consisting of First, Second, and Third gear. Take the following steps to access and place the transmission pan: Most manufacturers stamp the transmission identification numbers on the transmission housing. Outside that, you can push in your clutch and hold the brake. 3854728. A=M20 B=M21, C=M22). Hi. In fact, 1963 is a standalone year because changes in this box came almost immediately for 1964, beginning with the front bearing retainer, which was aluminum for 1963 and became cast-iron in 1964. How to identify and decode chevrolet manual transmissions. There were a total of six types. 3952645 shows up as the sidecover casting number for the 1972 Saginaw 3 speed. Further Muncie identification 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 Still hoping for some casting number identification assistance, if someone is willing to help. New Process Gear NP435 - 4-speed longitudinal transmission used in a select handful of 67-72 GM pickups But the other numbers don't match the extension or sidecover casting numbers. 3L80 - The 3L80 is a renamed THM400, used in the early 1990's. There is also a fine-tooth 26-spline input shaft employed from 1971-'74. For example, a GM vehicle from before 1967 has an ID tag that looks like C123N. 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). Chevy Hardcore NEWSLETTER - SIGN UP FREE! Cangialosi tells us all M20 and M21 transmissions were produced with both 10- and 26-spline input shafts. Like I said, the Muncie HD is a lot heavier. Effective October 21, 1968, an additional letter was added to the plant prefix number to help identify the gear ratios in Muncie transmissions. Generally used in straight and V6 and small block engines. Expert advice on car parts, maintenance, and repair. Looking for a Muncie shifter engineered to fit within your budget? The additional letter codes as follows: Of course like engines, transmissions come and go over time, so below is the (as complete Clean the area thoroughly and use a nice bright 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.. Post-67 Example: P9E03 (P = TYPE, 9 = year (1969), E = Month, 03 = Day of Month), Month code: This is a large reason why some guys will not rely on transmission identification by the input shaft grooves. There are different ways to determine the transmission type of a GM vehicle. For example, replacing a Powerglide with a Turbo 350 is an easy swap. M38 Standard Turbo 350 manufactured from 1976 to 1981. So it's definitely something you want. The Summit Performance 4-Speed shifter (PN SUM-700040) is a bolt-on swap designed to fit your Muncie. Unlike the Turbo 350, instead of a kick down cable, it uses an electrical slide switch, which is controlled by the throttle linkage. When it shifts from 1st to 2nd its got a really smooth shift and it puts a smile on your face. Turbo 400 is the biggest, Turbo 350s and Powerglides smaller. You don't have to search the classifieds or a junk pile to find a suitable bellhousing for your Muncie M20, M21, or M22. Generally able to handle up to 400 foot pounds of torque. The Turbo 400 was GMs heavy-duty three-speed transmission used from 1964 to 1990. The guys at Anaheim Gear tell us there are seven total Muncie input shaft options. You might have trouble observing the system if the vehicle has an installed gearbox. K 170. We will safeguard your e-mail and only send content you request. 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 easiest method of GM automatic transmission identification is to examine the transmission pan. Powered by UBB.threads PHP Forum Software 7.7.5. In the middle is the M21 countershaft and input shaft. Muncie (left) Saginaw The easiest way of knowing your GM transmission is by using a VIN decoder. The constants in decoding the trans ID number are the date the transmission was produced. Terms of Service. Some transmissions will have a code stamped onto them while others have a tag riveted to the case. The Head Casting number is located outside of the Valve Cover in plain site on the Drivers Side. This was used in A-body and F-body cars and Corvettes into the early 80s. Its useful to know the trim of your car so you can easily determine the transmission type. Post-67 Example: P9E03 - (P = TYPE, 9 = year (1969), E = Month, 03 = Day of Month), Month code: (NOTICE this is NOT in alphabetic order) Report an Issue | makes this job easier. Muncies are the hot tip, since they usually were used with high performance engines. Fodrea's legacy is far-reaching, extending into popular transmissions around to this day, yet most have no idea who he was. The first letter will be either. While its obvious that the four speed will use three shift-linkage arms and the three speed will have two, if the first letter is R, then you have found a four speed. It is also a cast iron case. Serif is a seasoned automotive enthusiast with a passion for cars. We are dedicated to giving you the technical support you need, when you need it! There are a couple of different debates that typically occur when a bunch of car guys get together. Transmission Stuff * Manual 3-speed transmissions * Muncie 4-speed Casting Numbers/Decoding/Identification * Powerglide * Turbo Hydramatic 350 * Turbo Hydramatic 400 * 200-4R/700R4 Overdrive * GM Transmission lengths & oil pan * Automatic transmission operating temps * TH350/TH400 Speedometer Gears Frames * Chevelle Frames Trim Tags The transmission codes are found on the Protect-O-Plate and in the following locations: . The Muncie 4-speed transmission was used with many different GM models and engine combinations from 1963-1974. The M-22 was generally installed behind Tweet Go here for Chevy Manual Transmission Identification. Build your own custom newsletter with the content you love from Chevy Hardcore, directly to your inbox, absolutely FREE! Some early 1969 transmissions did not have this code. Nov 16, 2011. Part of the problem with GM 4-speed systems is that theres a lot of variety. 13. The 3925656 is the casting number for the saginaw used in 68-75 at least. According to Cangialosi, two companies, Borg and Beck and Warner Gear, merged in 1928 to form BorgWarner. 3845122 is the casting number of the transmission case for the 1955-1957 3 speed transmission for passenger cars and Corvettes. Awfully close to a Muncie (3925660). 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 We're transmission experts, recognized by some of the greatest and most notable technicians in the automotive industry. This is what "The World's Best Chevrolet Club" is all about! The 1963-'65 M20 input shaft will not have grooves. The numbers 3831707 and the shifter linkage being attached with studs and nuts make this a side cover for an early Muncie. Some exceptions include the 1970 with either the SS396 or SS454, the 1971 and 1972 SS with the 454 engine where the H.D. On the Turbo 400, the VIN is stamped on a machined surface just above the pan on the drivers side. 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. With an old GM 4-speed manual, you have to observe the transmission system side profile. The pan contains several stamped numbers and codes informing readers about the transmission system. Yes, you can tell what type of transmission from a VIN number. 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. If a car came with an axle ratio of 3.73 (or numerically higher), it usually came with a close-ratio transmission. If it has a cast-iron case with an aluminum side cover and tail housing, that will mean you have found a Borg Warner. Summit Racing Equipment inventories all kinds of cast-aluminum and steel bellhousings for the Muncie. Sep 23, 2019. There are two significant variations of the Turbo 400. thoughts? For 1971-'74, a larger diameter, 32-spline mainshaft was employed along with the corresponding yoke. 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. 14. Has the casting # of 3925656. Another quick way to identify a Turbo 400 is to look at the kick-down mechanism. What makes the small-bore and large-bore case Muncies different is the input shaft bearing size and first gear, which rode on the mainshaft void of a bushing for 1963. track of what was what, it's best to ID your gearbox visually, taking what is stamped on the 8. fileslib. It was phased out of use and superseded by GMs 700R4 starting in 1982. 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. 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. GM 8. It was used on large displacement, high . Transmission Identification & Decoding. 17. If youre unaware, the production sequence is the last six numbers of your VIN. (AODE & 4R70W). The problem with checking the owners manual is that a junkyard find wouldnt have one. The right side numbers are 3925658 8338GM NFc4. THM700-R4 - 4 Speed transmission used in GM cars and light trucks with the 2.8, 3.1, 4.3, V6, Chevrolet built 305, 350 and 454 engines from 1982 to 1992. Transmissions can be identified in the following manner: Casting numbers : Located on the case, extension housing and side cover (manual). 2023 Power Automedia. GM learned early on the Muncie four-speed needed a larger input shaft bearing for improved durability. It functions correctly. The 4 cylinder models have 4 large cooling holes near the torque converter, while on the "bigger cars" there are no cooling holes. 18. If the gear shifts five times, its a 4-speed transmission. 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"); different casting number, which is 10168588. However, this method requires extensive knowledge of the oil pans. - Casting numbers on the case, extention housing and side cover Looks to be from a 68/9 camaro. For example, the first X will be a Letter from A through L. Add to quote; Share Only show this user. Few things excite like the sound and feel of an old-fashioned Chevrolet muscle car and that familiar whine of a classic Muncie four-speed transmission going through the gears. This is the M21 10-spline input shaft with a single groove and the applicable 27/22/19/17-tooth countershaft. They created a standardized naming system across the product line and changed the name of the Turbo 400 to 3L80. 3.55 geared and higher (numerically lower) cars used the wide ratio gearbox. The Muncie has probably been the most popular transmission among the hot rodding set since its inception in 1963. 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. All rights reserved. Also, the chances of older cars having an intact manual are slim. Remove the side cover and forks for a look at the geartrain. The Muncie was originally a stronger alternative to the T-10 and Super T-10 because it could take the torque. GM Turbo 350 and 350C (TH350 Transmission) 3 Speed Transmission. Last edited: Dec 16, 2012. . The M20 and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and close-ratio units. On the right is the small input shaft bearing, which is 1963 only. Your HTML, scripts like Google Ads, images/links, go right here. First, you must check whether its a manual or automatic transmission. 21. (center) Borg Warner (right). Weve sourced more than one Saginaw from Vegas in junkyards. This code was used for ten years from 1976 to 1986. SECOND TRANSMISSION. GM's goal with the Muncie four-speed was to produce a better shift employing larger synchro cones. numbers here that I can prove, so this is a short list. Chevy Hardcore NEWSLETTER - SIGN UP FREE! Need help to decode Saginaw 4 speed transmission. From 1967 on, the ID number contained the transmission type or plant prefix, Date (coded below), and a shift code. The standard 10-spline input shaft found its way into new Muncie M20 and M21 transmissions from 1971-'74. There is no leaking coming from the front seals, rear sears or oil pan. 2nd and 3rd row seats were optional. style 235 gets better compression numbers with an "848" Head, look for the last three numbers of that Casting Number. 10. Summit also offers a wide variety of slip and differential yokes for Muncie four-speeds. +$20.00 shipping. They are notoriously 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. General Motors has variety when it comes to automatic transmissions, and some of them have different pan shapes. The large-bore Muncie came into production in 1964-'65 and became the standard from then on through the end of production in 1974. Cases are either small-bearing (1963) or large-bearing (1964-'74). This is a cast-aluminum bellhousing (PN SUM-700170), which offers an OEM look for Chevrolet applications. by three Numbers and ending in another Letter (or two). There is no difference other than the name. Casting numbers on the case and extension housing. Check the car flooring, and if theres a clutch pedal, the transmission is manual. Enjoy the forum? He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963 . 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. There are not too many gearboxes that can make that claim. . 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. 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. However, classic cars usually have manual transmissions. The staff has been amazing to work with and takes care of their customers better than any other company I have ever dealt with. It was phased out of use and superseded by GMs 700R4 starting in 1982. Others have a tag rivited to the case. First came the Borg-Warner T10 beginning in the late 50s. The two transmission systems manual and automatic, have different working principles. The Turbo 350 quickly became known for its strength, versatility, and compactness. The 17-character number is a form of code that identifies the vehicle's specifications. 6. 11. GM's goal with the Muncie four-speed was to produce a better shift employing larger synchro cones. According to Cangialosi, the date was based on model year, not necessarily the calendar year. It also uses the same vacuum modulator as the Turbo 350. 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 CAUTION: This transmission closely resembles 343 Saginaw.
How To Unban Someone In Csgo Custom,
Is Donnie Wahlberg In Venom 2,
What Is The Strong Delusion God Will Send,
Virgo And Taurus Compatibility Friendship,
City Of Bozeman Building Permit Requirements,
Articles G