MXinAintEZ86

Hey guys I've been lurking on these threads for awhile I thought I had an account but guess not! Anyways I'm gonna be picking up a 93 4.0 auto 2x4 cherokee (for an ipod!) and I need the motor for my 89 with the 5 speed. Am I going to run into any issues with the tranny bolting up I heard there might be more splines on the H.O. and should I swap the entire harness setup or go with just using my old sensors? I'd like to get away from my old stuff as much as possible. Thanks in advance for a speedy response and I'll keep you all informed of my progress as I begin the process of swapping everything out.