Admin Table of Contents
How do you date a Muncie transmission code?
1967-1974 production codes will start with the letter P and have five numbers, for example: P9D09.
- P represents the manufacturing plant, Muncie.
- 9 represents the model year.
- D represents the month code when the unit was assembled, April.
- 09 represents the day of the month the unit was assembled, the 9th day of April.
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 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 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.
What kind of transmission did a 1963 Muncie have?
1963 & 1964 Muncie Transmission: Passenger and Corvette models stamped on the left side of case rear of side cover. 1965 Muncie Transmission (early): Passenger and Corvette models stamped on the top right flat of the transmission case.
Where are the identification rings on a Muncie transmission?
Identification Rings All original Muncie transmissions have identification ring grooves on the input shaft. These rings were put on for the Muncie assembly line workers to readily identify which input shaft they had to install. The original ring groove for each transmission is shown below in the following charts.
When was the first Borg-Warner Muncie transmission made?
The Muncie has probably been the most popular transmission among the hot rodding set since its inception in 1963. The Muncie was used in all high performance applications until the Borg-Warner Second Design Super T-10 began replacing it in 1974.
Where is the extension code on a Muncie transmission?
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. Muncie casting date codes are very different from other transmission manufacturers.