The GM SM465 4 speed manual adapter to the Dana 18 / 20 is 4.625” in length. And the adapter material is 356 T6 heat treated aluminum alloy and has an optional transmission mount provision. The adapter kit includes an adapter housing, 10 x 6 spline spud shaft, 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.
This adapter assembly is designed for exclusive use with the 4wd, GM SM465 4 speed manual with a 10 spline output shaft. This top loaded heavy-duty transmission has a cast iron case, and is 12” in length. It was used in GM trucks from 1968 to 1988. The SM465 was used in both 2wd & 4wd applications with 3 various output shaft spline counts of 10, 32, & 35 splines.