The Story Of The Muncie 4-Speed Manual Transmission The M22 Rock Crusher is part of the Muncie 4-speed manual transmissions, which General Motors developed. The name is derived from the Muncie ...

It's a design which heavily deviates from the older Muncie T-10 ... from the traditional 4-speed manual. Fitted solely to the top-tier NASCAR Cup Series, this transmission debuted in 2022 as ...