I bought a Haynes Repair Manual. It goes in depth with how to overhaul both the 2.3 and 2.6. AS well as literally every other thing you will have to repair or replace on your 86 trooper.
good luck

86 Trooper II
Stock except for the Rust and dents that came with it. Restoration while being a daily Driver is in progress. Completed so Far-Front Brakes, Rear Brakes, Frame restoration, 1 1/2" lift shackles, custom front and rear bumpers