The GM Saginaw 3 & 4 speed adapter to the Dana 18 / 20 is 0.715” in length. Adapter material is 356 T-6 heat treated aluminum alloy and the adapter has a provision for a transmission mount. The adapter kit includes an adapter housing, new 6 spline transmission main shaft, spacer, bearing, gaskets, fastening hardware, and adapter instructions.
This adapter assembly will fit any Dana Spicer 18 / 20, Scout version with a 6 tooth female drive gear. The transfer case index to the new adapter will require an index retainer & sealed bearing. Please I.D. the transfer case bore size (3-1/8”) small hole or (4”) large hole for proper retainer. Additional information can be obtained in our on-line catalog, Jeep & Scout Vehicle Section: Transfer Case Information, Jeeps 1941-79.
The transmission can be identified by a cast iron case that is 9-3/4” long and a side cover having 7 bolts. The reverse lever will be protruding out of the side cover.