An extra heavy duty close-ratio version M-22 was also offered on many of the big-block high-performance models. Some of the best Muncie builders participate on that page. All documented M22 transmissions have the 3925660 main case. Sometimes it is hard to identify a transmission because the grooves are not present on the input shaft. This equates to April 23, 1974, M21 ratio.
Install 6 extension and retainer-to- case attaching tainers, using a suitable sealer on bolts. Grit that gets into the grease in the shifter mechanism can cause real problems. From 1969 to 1974 all-ratio Muncies came with drain plugs. An M-22 holds up well. The M22 has higher-nickel-content gears of straight-cut design. Keep Dave West in mind. Then, he can put in a later synchro assembly and have the modern functionality with old looks.
For example, the serial number P8A01 is January 1, 1968. Notice that the serial number has been ground off left. He can put in a later synchro assembly to give his customers the functionality of a later model transmission and the looks and aesthetics of a '65. Place the two springs in position one on each side into detent on the shah detent plate. West doesn't work to different levels.
The main difference between the Muncie and the is that the Muncie has a 7 bolt side cover and the Borg-Warner has a 9 bolt side cover. Ratios of the M20, M21, M22 Muncie 4-speeds were produced in two different ratios wide-ratio M-20 and close-ratio M-21. If you take a one-foot wrench and increase its length by two feet, it will break a tight bolt loose. Most of these castings look very rough. I'm going to let go of the rebuilt M21. Extension Housings and Sidecovers Casting numbers relating to Muncie extension tailhousings aid you in seeing if the transmission you have is authentic or perhaps put together from parts.
The cluster is mated to all the speed gears, first, second third and fourth. The bushings used in the idler gear are pressed into g}! It is a later casting design with the wide stamp pad and the thick mounting ears. Start the ex- bearing fully seats against shoulder on gear. Also, there's companies out there that are making new gear set's for Muncie's as well. One side of the date marker has a month designator 1-12. It was developed for the Corvette Grand Sport racing program.
Many transmissions over the years have been rebuilt or replaced, upgraded from a 3-speed to a 4-speed etc. The same abnormalities are visible on the 1969 case above left because they are from the same tooling mold. The later 1966-1974 units had a 2. Muncie casting date codes are very different from other transmission manufacturers. The is distinguished from the in that the reverse lever on the Muncie is mounted in the extension housing, where the Saginaw reverse lever is mounted in the side cover. These two milled 3864 cases have March 1965 assembly dates. By late 1963 the rare 3839606 case started to show up in cars with a larger bearing bore.
It will usually begin with a 18S101350 or a 28N12950. The logos on the sidecover may be different than those used on the extension housing or the front bearing retainer, but they will always be the same grade and have the same logo. You can pretty much get what you want. Some people put the case in a vibratory finisher that gives it a different look. You would think that in nectors. If new idler shaft is being used.
Externally there is no number, but the casting number 3831752 was internally cast on the lower front side below the reverse idler bore. Shift mainshaft 3-4 sliding clutch sleeve into neutral i. Muncie 4-speeds pretty much have a solid chronological order regarding the main case, retainer, midplate, and extension housing casting numbers. If you mix and match randomly, the length and shape of the bends will change and affect the shifting geometry. West can take a '65 case and put in later model stuff. In- to assure proper alignment with the case.
Most of them are made before the1966-1970 period and were abused. The 9-digit code will tell you which division, year, model, assembly plant, and car the transmission was pulled from. The M20 and M21 came out about the same time in 1963, but the M22 didn't come out until 1965. Series Gear Ratio 1st, 2nd, 3rd, 4th Spline Input Grooves Input Cluster Pin Tooth Count Input Tooth Count 4th Cluster Output Spline M-20 wide ratio 63-65 M-20 wide ratio 66-70 M-20 wide ratio 71-74 M-21 close ratio 63-65 M-21 close ratio 66-70 M-21 close ratio 71-74 M-22 close ratio 65-69 M-22 close ratio 70-74 2. The Muncie case 3831704 replaced the T10 4-speed in the 1963 Chevrolet Bel Air and Corvette by mid-May of that year. The norm is the rear case is painted with a clear coat on it.