how to tell a muncie transmission m22 from m20
How do I identify a Muncie M20 transmission?
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 the difference between Muncie M22 and M21?
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.
How can you tell the difference between M20 and M21 gearbox?
How do I identify a Muncie?
Identifying The Muncie
The choice of transmission usually was determined by the engine size and rear axle ratio. An axle ratio of 3.73 and higher usually came with a close-ratio transmission. While vehicles with an axle ratio of 3.55 and lower usually used a wide-ratio transmission.
How do I know if I have a M22 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.”
Why is M22 called rock crusher?
M22 gears are also made of a higher-grade nickel alloy. The M20 and M21 cluster gears are cut at a 45-degree angle. The reduced gear angle of the M22 created a problem with noise (hence the name “rock-crusher”).
How much torque can a Muncie m20 handle?
From what I understand, they can handle way more than the t-10. 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. T-10’s are to be used on mild 350’s not 455’s.
How do you tell what year a transmission is?
Open the driver’s side door and find the white card on the side of the door that is filled with small black lettering. This card contains specific details about the year the car was made, its transmission, engine specifications and other details.
Where were Muncie transmissions made?
The Saginaw Michigan SM465 is a heavy-duty, four-speed manual transmission built by General Motors for use in light and medium duty trucks from 1968 to 1991 at the factory in Saginaw, Michigan.
How strong is a Muncie M22?
A Muncie M22 is only rated to 500 lb ft (matched to the output of a 454 LS6).
What cars came with a Muncie 4 Speed?
10-spline units came in these vehicles: 1964-70 Chevy Corvettes and Pontiac Tempest 1967-70 Buick Special, Firebird and Camaro 1969-70 Grand Prix 1963-69 Impala 1965-70 Nova and Olds Cutlass/F-85 and Chevelle (except 1970 w/454-cu.in.
How much fluid goes in a Muncie 4 Speed?
The Muncie 4-speed transmission will take about three pints, or 1 1/2 quarts of oil. Replace the fill cap.
What transmission is the rock crusher?
He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963. The M22 Rock Crusher would come later to accommodate the heavy twist of Chevrolet’s big-blocks in the mid-1960s.
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21.
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21.
| Countershaft Identification | |
|---|---|
| Type | Number of Gear Teeth (1st/2nd/3rd/4th) |
| M22 Rock Crusher | 27/22/19/17 |
•
Aug 3, 2018
How much is a Muncie 4 speed 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!! Questions on our core exchange policy?
Did Ford ever use a Muncie transmission?
It was used right up to 1971 in the Ford Pickup F100 with an overdrive. The T10 shares the same case design, gear centers, and 3-4 synchronizer as the T85.
How strong is a M21 gearbox?
With the standard 3.36:1 differential ratio, the M21 gearbox gave them maximum speeds in each gear of 50, 75, 100, and 125 mph. The taller 3.08:1 ratio differential raised the speeds in each gear by about 10% and increased the top speed to 135 mph.” This is why most guys were after M21’s when I was racing.
Who makes Muncie transmission?
General Motors
The Muncie 4-speed transmission is a legend among fans of GM muscle cars. For a 10 year period starting in the golden age of 1960s performance, General Motors‘ Muncie, Indiana transmission factory churned out several different flavors of this manual gearbox.
Where is reverse on a Muncie 4 Speed?
Reverse gear is a sliding gear. It has no ability to synchronize; therefore, you can only put a car into reverse when you are at a complete stop. The shifter shaft in the extension housing is the reverse shaft.
What is the gear ratio on a M20 Muncie?
2.56:1 ratio
The 2.56:1 ratio is referred to as the M20. Muncie also had a second close-ratio transmission coded M22 and known as the “rock crusher,” which was used behind performance big-block engines and in some Corvettes.