Project #1- 1984 X-tra cab on 1986 4Runner frame. For this project my brother wants to build an adapter to mate an RF1A low range box to an HF2A transfer case. I would have thought this adapter already existed. I had considered using an R151 transmission because some were mated to 22RE's and HF2AV's, though not in the same truck, as far as I know.
Project#2- 2001 Jeep TJ 4.0L/AX15 bellhousing/H151/HF2AV/FZJ80 axles. The R151 and AX15 share the same bellhousing on a 4.0L jeep engine. I am told on exploroz.com the R151 and H151 mate to the same bellhousing. The H151 is a common swap into FZJ80's with HF2AV's, the output/input's should mate if the proper year models are used. With the proper clutch and pilot bearing, this combination should be possible. The only part I am missing is the H151. Normally I would have sourced this from Marv Spectre but sadly this is no longer possible.
The prospect of building Project #2 frequently agitates toyota purists.