It uses much the same gear ratios as the close-ratio M-21, but can take more abuse. You can pretty much get what you want. In addition to our professional interactions, I keep a set of his Chevrolet by the Numbers books within an arms reach as they are an incredible resource. The only negative was the noise that this transmission would produce. Assembly Instruction Manual with the date stated on the A. Well it wasn't designed so that you could go drag racing on Saturday night or impress girls in front of Burger King by doing massive hole shots.
Only one pair of hands build your special Muncie 4 speed so it is done right the first time to your specs. His technical ability is obvious with the series of books he has written on the auto industry. It was the transmission of choice for practically every performance-engined car made during the muscle-car heyday. You can really hear this gear box howl in the background as James Taylor and Dennis Wilson talk shop in a 55 Chevy. If the numbers don't match, your transmission has been changed, though remember that even an original tranmission may have had parts swapped for repair work at some time through its life. West will build it for him or her.
The M22 remained fairly the same for its entire life cycle, with the exception of switching from a somewhere between 1969 and 1970. The M22 continued to use the same tailhousing, side cover and front bearing retainer as all other Muncie transmissions. The '64 and '65 transmissions are very popular, especially with Corvette guys. A close-ratio gearbox keeps shift points closer together, which keeps rpms up. The straighter angle of the gearset produced less heat and less end loading of the gear train.
The basic design and operation theory of the gearbox changed little during that time, though several design upgrades and modifications were made during the total production run. All documented M22 transmissions have the 3925660 maincase. Re the in-box overdrive: Yes, original forth becomes third, overdrive goes in the original third gear position in the box, you flip the 3-4 shift lever on the side of the trans so it points down instead of up and your shift pattern remains the same. The third digit is the code for the assembly plant the car was built in. The next piece of documentation was the factory car order which was sent to Gorries Chevrolet to state how the car was to be built and that it was now awaiting production.
Here's the catch, as usual. Beyond these manufacturing and distribution facilities across the country, Muncie Power Products maintains a global distribution network to best meet customer application needs and provide industry leading customer service. This number is used to designate this particular car, the options assigned to it, and the schedule to build the car. There is one mistake on this sheet in that the color of the car is listed as blue. Not for passenger car as some self proclaimed specialists may think. They were used in many muscle cars and Corvettes.
This upgrade was mandatory due to the advent of newer and more powerful engines that were to be introduced to the Chevrolet engine lineup for the next several model years. People think all Muncie four-speeds are Rock Crushers, but they're not. This sheet lists by model year, each M22 assembly shipped from Muncie with accumulative totals across the bottom of the page. It is a far better match to a lighter vehicle with a 4. I know that the M22 was supposedly stronger than the M21 and that the close ratio rock crusher was supposed to the the beefiest, but not sure why or if this is even true. Combined with high impact alloy gears this 4 speed really pushed the limits of it's aluminum case in drag race applications.
A close-ratio gearbox keeps shift points closer together, which keeps rpms up. The later Muncie gearboxes used a much sturdier bearing retainer which holds up better in service. They included serious injuries, amputations and even death. The 1965 M22 also had the drain plug boss drilled and tapped for a magnetic drain plug. Always check to see that the date marked precedes the final assembly stamp code.
The last six digits should match the last six digits of your V. He immediately sent some snapshots to me of the transmission which started several months of letters and phone calls. He also later supplied me with more detailed photographs of the transmission. This cutaway Muncie transmission shows a good look at the main shaft on top and the cluster gears on the bottom. The M22 is now in my 37 Ford. A new maincase was not to be released until the start of the 1966 model year. We would like to thank everyone that has contributed to the data provided on this site.
Many Muncie main cases, tail housings and side covers have casting date codes. It was a turning point for the company with Shafer now at the helm, with his part interest and appointment as general manager. Also, all '71 and newer Muncies had the 26 spline input, Turbo 400 size output, and drain plug that the M22s had, so don't be fooled into paying M22 prices for a non M22 transmission. These new requirements led to the demise of the Muncie and the reintroduction of the improved T10 called the Super T10. This information has been gathered from several sources and has not been verified.