From Advance Adapters site:
The Dodge NV4500 adapter to the Bronco Dana 20 is 1.00” in length. And the overall length of this transmission and adapter is 19.50”. Adapter material is 356 T6 heat treated aluminum alloy. The adapter kit includes a Bronco Dana 20 adapter plate, spud shaft with 23 internal spline, t-case shifter bracket, bearing retainer, bearing, snap ring, gaskets, seal, o-ring, fastening hardware, and adapter instructions.
Transfer Case
The adapter assembly will fit any 1966-77 Bronco Dana 20 transfer case. This adapter will only work with the “T” style shifter.
Transmission
The adapter kit is designed for exclusive use with the Dodge 4WD NV4500 transmission with a 23 spline output shaft.
Options
1966-77 Bronco owners, we manufacture a new structural member that fits between your frame rails.
716000-4 Crossmember.
716101-2 Rubber crossmember mount.