Hopefully someone can expound on the swap of a Chevy S-Blazer/S-10 231 transfer case into a YJ. This was mentioned on a recent thread, and the local 4X4 shop says it is possible to install a S- model 231 as a direct replacement for the NP231-J jeep transfer case, followed by a Turbo 350 tranny and then a 4.3 or small blockChevy V-8. All this with no adapters. Are the shaft splines the same. What obstacles must be overcome in this installation? I have an 89 YJ with a tired 258/auto and already have several spare small block chevy engines and a 77 K-5 Blazer Turbo 350 tranny sitting around. What year S-model 231 case should I be looking for to do an engine swap in the future? Would the full size Blazer Turbo 350 work in this conversion, or will I need one from an S-model? Just like the 94 and newer Dodge truck NP231-DHD heavy duty case looks like a drop in replacement for the jeep 231 when using Mopar drivetrain components, is there a heavy duty version of the NP231 from the Chevy/GMC stables that might work better that the S-model in a small block conversion. (I'd rather stay away from adapters if possible.) Thanks in advance for your technical expertise!