Get a NP231 Rebuild kit here https://amzn.to/2WFpI2h
In Canada get a NP231 Rebuild kit here https://amzn.to/2JYE0Fc
this is part 2 of the very Detailed NP231 rebuild that i'm doing for my LS Swap Project. Rebuilding the transfer case for your jeep is actually a easy project if you have some basic mechanical skills.