About Muncie 4 Speed Transmissions

The Muncie 4-speed transmission is on the shortlist of car options with legendary status. The very mention of this transmission summons fond memories of better days when cars were muscle cars and a 10 mile per gallon racer was considered "economical."

History

The Muncie 4-speed was produced for GM cars from 1963 to 1970 and was the transmission of choice for practically every performance-engined car made during the muscle-car heyday.

Identification

Muncie transmissions can be distinguished from Saginaw and Borg-Warner four-speeds in two ways: The reverse lever of a Muncie is mounted on the tail extension and it has a seven-bolt side cover to the Warner's nine.

Variants

The Muncie came in two basic flavors: the M-20 wide ratio and M-21/22 close ratio boxes that were used in performance applications.

M22 Rock Crusher

The M22 rock crusher is the transmission most people think of when they hear "Muncie." This heavy-duty variant was used exclusively behind big blocks, and had a stronger input shaft and gears than the other two four-speeds.

Interchangability

All Muncie transmissions will be a direct bolt-in swap for each other as they vary little in external dimension and control systems.

References

• Year One
• 5speeds.com

Resources

• Muncie Transmission (Video)