Our GM SM420 adapter to the Land Cruiser 10 spline transfer case is 4.50” in length. The adapter material is 356 T-6 heat treated aluminum alloy, and the adapter has a provision for a transmission. The adapter kit includes an adapter housing, 10 spline spud shaft, bearing retainer, bearing, snap ring, set collar, gaskets, fastening hardware, and adapter instructions. Transfer Case This adapter assembly fits 1963-73 10 spline transfer cases. The drive gear has 10 internal splines and a diameter of 1.375”. There cases are equipped with a vacuum style shifter. Additional information can be obtained in our Land Cruiser Conversion Manual, TLC001. Transmission The kit is designed for exclusive use with the GM SM420 4 speed transmission. The SM420 was used in GM trucks 1947 to 1968 and has a 10 spline output shaft and was used in both 2wd and “divorced” 4wd applications. Options 716022 Crossmember. This popular mount bolts to that back of the transfer case. 716044 Crossmember. This mount bolts to our transfer case adapter.