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 spline spud shaft, gaskets, fastening hardware and adapter instructions.
This adapter assembly will fit any Dana Spicer 18 / 20 version with a 10 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.