The GM Muncie 4 speed adapter to the Jeep Dana 300 is 5.075” long. The adapter material is 356 T-6 heat treated aluminum alloy. The adapter has a provision for a rear transmission mount. The adapter kit will include a new main shaft for the Muncie, seals, gaskets, fastening hardware, & adapter instructions.
The adapter assembly fits the1980-86 Jeep Dana 300. All 300s use a 23 spline input. Some of the adapters we manufacture include a new Dana 300 input with a different input spline. Therefore, if you obtain a Dana 300 from a salvage yard, please verify the input spline.
The GM Muncie M21 / M22 can be identified by an aluminum case that is 10” long and a side cover with 7 bolts. The new main shaft included in the adapter kit will fit all models 1963 to 1974. 1963 models will require addition parts.
715600 Hurst Competition Plus shifter
715501 Shifter Bracket
716021 Transmission mount
715625 Muncie Rod Kit (Male Studs) or
715626 Muncie Rod Kit (Female Studs)