How do you identify a Muncie rock crusher?
How do you identify a Muncie rock crusher?
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.”
How do I tell what Muncie 4 speed I have?
Another way to confirm that the transmission is original to your car is most Muncie four-speed transmissions will have a Vehicle Identification Number (VIN) number stamped on the main case. The engine and transmission were stamped at the same time by the final assembly plant.
What is a Muncie 4 Speed Rock Crusher?
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 date a Muncie 4 Speed?
Many Muncie 4-speed main cases, extension housings, and side covers have a casting date code. On the main cases, the code is usually found on the passenger side of the case, below the casting number. The extension housing code is usually within a few inches of the casting number, also on the passenger side.
How do I know if I have Muncie M20 or M21?
If you examine the 1966-’70 wide-ratio M20 input shaft, there are two grooves cut amid the 10 splines. From left to right are the three basic Muncie input shaft/countershaft combinations. On the left is the M20 countershaft and 10-spline input shaft. In the middle is the M21 countershaft and input shaft.
How much is a M21 Muncie worth?
Muncie 4 Speed M20 or M21. $2899.99 OR WITH Muncie CORE exchange $2499.99. If you have no useable core the price is $2899.99!!
How do I know if I have a 4 speed transmission?
While it’s obvious that the four speed will use three shift-linkage arms and the three speed will have two, if the first letter is R, then you have found a four speed. If it starts with an S, you are looking at a three-speed Saginaw.
How can you tell if you have a M22 Muncie?
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.