I have a 88 Pioneer Big Ton, 4x4 manual, with 230k miles. The motor is decent but I'd like to update with a HO version. The donor is a 94 Cherokee, auto, with 83K miles. My plan is to replace the entire drive train, wiring harness, ECM, etc.
By replacing the entire harness(dash forward) will I run into compatibility problems, or problems in general? I have the FSM's for each truck so I will be able to slowly get through the swap but I'd like to get any insight from people who have done this before.