The early ring right had a problem: Cracks developed at the key slot. The output shaft was increased from 27 splines to 32. It had three major service issues affecting 1984 and 1985 models. Today, you don't know if your getting Chinese steel that'll wear in no time and trash your tranny. These proved to be very weak and were replaced by a cast-iron retainer 604932. If you know how much force you need on a bolt using a torque wrench then you should be able to guess the amount needed here.
Each time I do a rebuild on someone's trans, if I find something easier to do I'll make a change in the document. With case standing upright, use petroleum jelly or grease and retain 1 of the 2 countergear thrust washer to the front of the transmission case. The seamed spacer tube used six. Note: pin is removed from the bottom. An example would be the date code P8T13, meaning 1968 8 , December T , 13th. If new idler shaft is being used. The diameter of the main case countershaft bore was officially increased to 1 inch.
According to original engineering drawings I have of the M22 first gear, it is made of an 8620-alloy steel. Always use a later-style pin right when doing a rebuild. West bores the cluster pin and puts in a 1-nch pin. Trial fit the snap ring on the side of the groove before sliding the snap ring down the shaft. Patent Number 3,088,336 see Appendix. Because the needle bearings ride against the seam, extra spacer rings are needed to cover the seam.
Install reverse idler rear gear shaft washer that has no tang. Mixing late long-slot arms on early short-slot shafts causes the linkage to go out of alignment. As a result, all M20, M21, and M22 countergears had to be redesigned to accommodate a larger countershaft. Remove 1-2 and 3-4 shifter forks. Tools needed to make the job easier.
Parts Illustration Muncie M21 4 Speed Manual Transmission Below find a parts illustration for the Muncie M21 4 speed manual transmission used by General Motors between 1966 and 1974 in the following models: Pontiac Firebird, Catalina, Grand Prix, Lemans, Oldsmobile Cutlass, Jetstar, Cruiser, Chevrolet Camaro, Chevelle, El Camino Corvette and Nova. Then manually shift transmission through all gears and check Rotation. Drain the oil into a container. You are welcome to download and print this illustration. The M22 has higher-nickel-content gears of straight-cut design.
Remember which way the inner hub faces. Remove 3-4 synchromesh assembly and 3rd gear. Also is a replacement for the later shouldered pin. Install side cover gasket and carefully position side drive gear retaining nut threads are mad. Muncie 4 speed transmission parts munciet10 4 speed gear train diagram. You also need to remember that all record keeping was done manually and sometimes the changes were left undocumented.
The hole in the shaft was actually used on 1969—1970 models that had a clip-on plastic gear. Turn assembly over and remove rear bearing retainer snap ring. Note the orientation of the inner hub facing to the front. Beginning in 1967, transmissions had a date designator added to the serial numbers. It had a small 6207-style front bearing and an aluminum front bearing retainer.
It was no longer just an M22 thing. Lock transmission up by shifting into two gears. Use your fingers to slide the slider into the 2 gears. The 3925661 main case casting was used exclusively and a new tail-housing 3978764 with only three shifter-mounting holes was added. Place gasket in position on front face of rear bearing 13. The 1969-and-up shafts used a bolt-on style, which eliminated broken studs and stripped threads.
This is a pair of Muncie first gears. If the shaft is tight on the bearing then take the case to the press and press it out. Many Corvette restoration books share the common misconception that the 4-speed T10 and Muncie are two separate entities. Crg research report 196769 camaro manual transmission floor shifters 4speed shifter. Slide 1-2 synchromesh assembly into 2nd gear and 3-4 synchromesh assembly into 4th gear. You may need to tap the bearing towards the front to make it easier to get the snap ring pliers in the space. Lower the mainshaft assembly into the case making 18.
So the fix was to use my old 1st gear sleeve on top of the new one then all the other old parts I listed in the line above. Turn case to rest on its front end and install rear countergear thrust washer slide into position of lock slot. Of course, rodders get a little creative. Counter gear and shaft overhaul: Remove one hundred and twelve 112 needle roller bearings, 6 washers, and one roller spacer tube. These are easy to adapt to a wide range of hot rods. All gears and synchronizers are in the same position. BorgWarner was a company founded in 1928 from the merger of Borg and Beck founded in 1904 and Warner Gear founded in 1901.