We started this project by locating a used NP205 transfer case found behind a TH400 transmission. These are available in most wrecking yards across the country. We picked this version because it features a stout 32-spline female input shaft. We could have used the version of the NP205 found behind the popular SM465 manual transmission found in 1968-78 GM pickups, but with only 10 splines on the input shaft, we would have had to swap it out for either a 1979-91 (32-spline) version or the TH400 type mentioned above. If you do not have or cannot find the proper type of NP205, don't fret. Off Road Design has everything you need to convert your NP205 into the version that fits your transmission.