What is the difference between a Muncie M21 and a Muncie M22?
The M20 and M21 transmissions produced from 1963-’74 are easy to identify in both wide- and close-ratio units. The M22 to come later in 1967-’74 is also a close-ratio unit, but much stronger than the M21, with a higher torque capacity.
Which Muncie is the rock crusher transmission?
Muncie also had a second close-ratio transmission designated M22 and often referred to as the “rock-crusher,” which was used behind the highest-performance engines and in Corvettes, the M22 is a highly sought-after performance transmission. It is the heavy-duty version of the 2.20:1 ratio M21 four-speed.
How do you tell a Muncie m20 from M22?
Because main cases are often swapped rather than being repaired, the best way to determine if you have an M20, M21, or M22 is to simply look at the gears. Without removing the sidecover you can look at the input shaft and check for identification grooves cut into the spline.
Do they still make Muncie transmissions?
Muncie Transmission is back! General Motors stopped installing “Muncie” 4 speeds in 1974. Complete units were able to be purchased from GM until the late 1970’s. Parts trickled out of inventory by the late 1980’s.
How much torque can a Muncie M20 handle?
The muncies have better cases & handle up to 500-600 lbs-ft of torque. I know my muncie m20 & my friend’s m20 handle our cars at over 500 lbs-ft of torque.
How do you tell a Muncie M20 from M22?
Are Muncie transmissions still made?
In 1990, General Motors combined Muncie transmission operation with Chrysler Corporation’s New Process Gear creating New Venture Gear, Inc. The partnership later dissolved and the company once known as Chevrolet-Muncie closed its doors on March 31, 2006.
What cars came with a Muncie M22?
From 1965-onwards the Rock Crusher was available with the Corvette, and by 1969 it was found on vehicles as diverse as the Chevelle, the Camaro, and the Oldsmobile 442. If a car made big power, chances are a Muncie M22 was on the menu.
How do I know if my M22 is a rock crusher transmission?
Look for the “GM” sign imprinted on the transmission box to identify the manufacturer of the transmission. Check whether there are any rings around the shaft splines. An M-22 “Rock Crusher” has no rings, so if you see rings in your transmission, it means it is not an M-22 “Rock Crusher.”