A few shim plates, three shims, and a pivot mechanism for the stick is really all that makes it work. The M20 and M21 have the same cut to the gears, the M22 is a straighter cut resulting in a greater strength. Cleaning up a Hurst shifter helps your Muncie shift smoother and more easily. In actuality, more M20 units were produced with this configuration than were M21 and M22 models. We supply the necessary components to adjust the engine position to accommodate the North American steering configuration. This gear set is offered under.
Vibrations are usually related to tires, driveshaft, and piloting issues. If your stops are adjusted too far they may prevent the transmission from going fully into gear. Step 2: Remove Rear Plate I use two punches to spread the back end of the case open to remove the rear plate. The cases have a distinctive similar size, shape, and cover-bolt pattern. You must check everything, and that includes all new parts.
The photo right shows the proper assembly on one of our shafts. The shaft and gears should be set at. This transmission has proven to be a very popular application. This mount plate can work on both the 27- and 32-spline Muncie extension housings. This transfer case has a low ratio of 2. Take note that the arms are bent and the position of the rods.
This should be enough time for the transmission to slow down on its own so if there is any type of grind or clunk, the transmission is still turning when it should not, indicating poor release. The first symbol indicates division, the second matches the last digit of he model year and the third tells what assembly plant the car was built in. The steel spring shim plates can be very sharp so be sure to use caution and wear protective gloves. M22 production was rare in both 1966 and 1967; 29 were produced in 1966 and only 20 in L88 Corvettes in 1967. Muncie 4-speed Transmission Group 4. In order for a synchronizer ring to do its job properly, it must be able to sync up the shaft and gear speeds with no engine load on it. The problem of falling out of gear is frequently misdiagnosed; people are very quick to blame synchro rings or shifter adjustment.
After 1965, the first-design Super T10 added a front seal, yet the Muncie never had one. I'm not too sure how true that is, but I did get my hands on a factory 4 speed shifter. The matching splined teeth on the slider also wear. Later on, this transfer case was switched to a mechanical-type shifter linkage, which eventually evolved into the later model 4 speed linkage design. Remove transmission gearshift lever seal from the floor pan. If any roughness still exists, one of the clevises may require adjustment of approximately one-half turn.
This is generally caused by pilot bearing failure that generally damages the input shaft. Sliders that are loose on the hubs can cause rattles. I have spray greased the inside of the competition plus box to no end. Because the raceways are rotating and the balls are spinning, the damaged portions of each component never contact each other in the exact same place. If you attach a small-retainer transmission to a large-bore bellhousing the transmission is not piloted correctly. The M22 transmission has a 20 degree helix angle on the gear set as opposed to a 45 degree angle found on the M20 and M21 and were made with a higher nickel alloy. If you would rather isolate your gear box fluids, a sealed bearing can be purchased under.
Inspect the forward side of the front idler. The only adjustment possible with this type of transmission is a linkage adjustment for a clean neutral gate. We now offer new transmissions with our adapter kit installed. Notice that the 1-2 arm bends toward the cover and the 3-4 arm bends away from the cover. First-gear power comes in from the input shaft, travels down into the countergear, and up through first gear. These detents function as interlocks, preventing any two forward-speed gears from being shifted at the same time.
All gears are freewheeling around the mainshaft. When designing transmissions you have to remember that as vehicles change dynamically increased horsepower, weight, or gas mileage requirements the transmission also has to change. You will see that James W. His brilliant and well-thought-out idea was to make it into a 4-speed. The problem with this design is that it is very possible to shift into reverse and one of the forward-speed gears at the same time because no interlock mechanism is present.