On the far right is the M22 26-spline input shaft. The clock looks like a mathematical fraction with a 1/2-inch circle around it; they were a way to track any quality-control issues. 1. Of course, every company has a unique logo on its bolts. Muncie 4-speeds pretty much have a solid chronological order regarding the main case, retainer, midplate, and extension housing casting numbers. M22 - M22W M22X One of the most common problems is rough bearing failure noise coming from the front of the transmission clutch area. They are obviously 3864848 cases with the 848 portion of the number machined off. I spent a great deal of time sorting through their parts. Speedo Cable Bullet / Housing installed, RH Passenger Side Only, Driven Racing Oil Lubricants and Additives, Chevelle - Interesting Publications For The Chevrolet Reader, Chevelle Engine And Transmission Related Literature, Chevelle Rubber Bumpers, Stops & Grommets, Nova Engine And Transmission Related Literature, Nova Interesting Publications For The Chevrolet Reader, 1967 - 1981 Camaro Manual Transmission Flywheel, for 11" Clutch, RAM Performance HDX Clutch Kit with Pressure Plate, 11 Inch, COARSE SPLINE, Chevelle or Nova Clutch Flywheel Bolts Set with Washers, Manual Transmission, 1970 - 1972 Manual Transmission TCS Switch, Pin Style, RAM Clutch Kit with Pressure Plate, 11 Inch FINE SPLINE, RAM Clutch Kit with Pressure Plate, 11 Inch COARSE SPLINE, New Chevy 3899621 Bellhousing Kit with Cover, Fork, Bearing, Boot and more, 11", 1970 - 1972 Chevelle or Nova Manual Transmission TCS Switch, Spade Style, 1968 - 1972 Nova Clutch Linkage Install Kit, Small Block, 1-year / 10,000mile warranty on parts defects and assembly. (The M does not stand for Muncie.). All M22s use a 26-spline shaft made from a stronger alloy than the other 4-speeds. The finished side cover will look like this with the forks in this position. The internals are installed in the Supercase, Summit also offers a wide variety of slip and differential yokes for Muncie four-speeds. 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. Gasser Drag Race with Long V-Gate Shifter. Usually a casting number is changed because of a design change. That the Muncie has much in common with the T-10 is no accident. 10. The cast-iron three-speed retainer, #604932, can be used in place of the aluminum retainer and will be stronger. Cangialosi tells us all M20 and M21 transmissions were produced with both 10- and 26-spline input shafts. Your email address will not be published. iron midplate and heavy duty tail. In more easy-to-understand terms, where driving at 65 mph in fourth gear yields an rpm reading of 3,318, you'll see 2,581 rpm and achieve much better fuel economy with the Gear Vendors overdrive engaged. Having issues diagnosing problems with your M21 M22 4 Speed Muncie Manual Transmission? Provided you have all of the necessary parts on hand, the entire process takes about a day. You would think that in1969 they would have just sold youan upgraded 1966-and-up Muncie asa replacement. Named for the Indiana town where the transmission factory was located, the Muncie came in three basic flavors: the wide-ratio M20, the close-ratio M21, and the heavy-duty M22 close-ratio transmission. They often get angry because they dont want to face up to the fact that they got burned and made a bad 4-speed purchase. Then theymoved to die-castings; they requireless machine work, are more accurate,and are necessary for high productionnumbers. Cangialosi explains there were two basic mainshafts produced for the M20, M21, and M22 transmissions (see Input Shaft Identification chart). The Muncie case (3831704) replaced the T10 4-speed in the 1963 Chevrolet Bel Air and Corvette by mid-May of that year. This is for a 1968 production car. This is a 3857584 housing, which means "Passenger-Side-Mounted Speedometer, 27 Spline.". This is an M21 with 10-spline input shaft and cast-iron bearing retainer. The 1963-'65 M20 input shaft will not have grooves. You really cannot get the early M20 and M22 mixed up because the early M20 came with a 7/8-inch countershaft, while the M22 did not. Certain make and model GM cars used one type while other models used something different. This version stayed in production until 1974. Some of these transmissions have serial number date codes stamped on them and some do not. 7. Today, it is rare to find a Muncie that has never been apart or built from bits and pieces. The first Muncie case was number 3831704. Because this mainshaft is larger, you're also going to need larger bushings and seals. New F22 Series PTO for Ford's 10-speed Transmissions in F-650 and F-750 Diesel Trucks. 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. Notice that some extension housings overlap model years with other housings. Muncie 4 Speed M20, M21 and M22 Input Nut Wrench, WT297-W. It had a 7/8-inch countershaft bore and used a 6207-type front bearing. Price: $ 249.99 Sale Price: $ 189.99. [Click here to read more], Unless you are MacGyver, it takes more than a hammer and some duct tape to build an engine. This is an M21 with 10-spline input shaft and cast-iron bearing retainer. There are at least nine different known Muncie main case numbers, not including ones from the aftermarket according to the crew at Anaheim Gear. STRONGEST Direct Replacement M22 With NEW Muncie AUTO GEAR ULTRA CASE With The Strongest M22z ULTRAWIDE RATIO 4 SPEED TRANSMISSION. Removal of the front bearing cover is where disassembly begins. The last Muncie case was the 3925661. This is the M21 10-spline input shaft with a single groove and the applicable 27/22/19/17-tooth countershaft. Price: $ Sale Price: $ 799.99. Side-by-side are the two countershaft support sizes, which are 7/8-inch (left) and 1.000-inch (right). Note the single groove, meaning an M21 close-ratio. Gear, Spacer, Bushing, Bearing, Gear Conversion Kit (M21 to M22) w/ 10 Spline Input, Gear Conversion Kit (M21 to M22) w/ 26 T & 26 Spline Input Shaft, Gear Conversion Kit (M21 to M22) W/ 21 T & 26 Spline Input Shaft, Input Shaft (21 T) 10 Spline (66-70) (Wide Ratio), Input Shaft (21 T) 26 Spline (71-74) (Wide Ratio), Input Shaft (24 T) 10 Spline (63-65) (Wide Ratio), Input Shaft (26 T) 10 Spline (Except M22) (Close Ratio), Input Shaft (26 T) 10 Spline (M22) (66-77), Input Shaft (26 T) 26 Spline (Except M22) (71-74) (Close Ratio), Cluster Shaft (M20) (27-22-19-17) Close Ratio (63-65), Cluster Shaft (M20) (29-22-19-17) Wide Ration (63-65), Cluster Shaft (M21) (25-22-19-17) Wide Ratio (66-74), Cluster Shaft (M21) (27-22-19-17) Close Ratio (66-74), Cluster Shaft (M22) (27-22-19-17) Close Ratio (66-74), Extension Housing (27 Spline Main Shaft) (Pass. However, neither compares to the Muncie in terms of strength. When you have the two side-by-side it becomes obvious which is which. Multiple ratios, Heavy Duty case, center plate and tail. For example, the serial number P8A01 is January 1, 1968. These cases were obviously repaired but sometimes a replacement case was the only fix. C355 Forged Aluminum Mid-Plate. Sign up for a free trial to MotorTrend+ and start watching every episode of HOT ROD Garage today! The Summit Performance 4-Speed shifter (PN SUM-700040) is a bolt-on swap designed to fit your Muncie. Before you here are the basics of Muncie M20, M21, and M22 four-speed transmissions. From 1971 through the end of production in 1974, the M20 got the 26-spline input shaft. Limited Production!!! (verified owner) July 4, 2018. Shown here is the M20 10-spline wide-ratio input shaft and counter gear. Package Price: $11.35. Jeff Collins The synchro rings have 35 teeth and the unit has a 4 step cluster gear. Two are early style side covers. This is a good exampleof why looking at grooves on inputshafts may not be a sure method ofidentification. Casting 384362 is the long-tail versionwith a driver-side speedo. Most of the time the other cloc is blank, but occasionally it represents numbers and deviations to the original blueprint. You can copy and paste this link to share: https://www.chevydiy.com/muncie-4-speed-identification-guide/. GASSER MUNCIE SUPER DUTY ULTRA CASE M23 4-Speed. The fact is General Motors couldnt use a standard 6307-style bearing with a width of 21 mm because the gears were already tooled and made. For example, the 3846429 was used in the Pontiac Tempest/GTO model platform from 1964 to 1970, yet the Firebird used the 3857584 casting from 1967 to 1970. Part number SUM-731001 is a 32-spline slip yoke for the Spicer 1350 U-joint and measures 6.250-inches long. These guys stockpiled a lot of parts! 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. It uses stronger components to handle big-block power. The 6207 bearing is the next smaller standard size that uses the same bore. This might have been a different alloy because its appearance is identical to the 3851325 case and it was to be used strictly with the new big-block 396 engine. Fodrea's legacy is far-reaching, extending into popular transmissions around to this day, yet most have no idea who he was. cally, some covers were issued with The case has several unusual feastud-type shifter shafts and oth-tures. What you will find in your search for the right Muncie four-speed is conflicting information from different sources. $125. Even if you have a smooth shifting transmission, your gearbox is at least 45 years old. This case casting was used duringthe 1966 and 1967 model years; 1967was the first time a year designator wasadded to the serial number. The progression of the 10-spline input identification groove system. 15. The 1965 case with the same casting number has a squared-off upper extension housing boss. The Muncie was originally a stronger alternative to the T-10 and Super T-10 because it could take the torque. This is a 1970 M20 case. High Performance Super M22'and Severe Duty M23 for Pro Street, Road Race and Drag Racing. Many part numbers exist for the same transmission because of different speedometer gear combinations across different model platforms. Ithas the early non-hat-style pivot pin. 1. (Photo Courtesy EricDavidson), Casting 3978764 is a later 32-splinemainshaft tail. The cases offer a broad range of interchangeability. Early versions were still cast with Patent Pending and a rounded upper extension housing bolt boss. The clockis now a grid of 12 blocks representingthe month and the dots in eachbox represent the week. Columbia, TN. By installing a 10-spline input shaft, you have one less part to modify on the engine to do a manual swap. Update on new Muncies transmissions as of January 1st 2022. These small parts are shown on the table along with the cage. 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