I never covered the specs, so here goes.
'87 MJ pioneer, 4.0, AW4, 231, factory 44 geared 4.56 w/ lockright, 30 geared same, approx. 7" lift using RE drop brackets and components, rear spring over, was longbed, now bobbed 15", 97-01 frt. clip, 35" mtrs on Jeep Canyon wheels running 1.5"" spacers, XJ buckets, tuffy YJ console.
When I bobbed the bed, I cut the framerails off and made a new rear crossmember w/ shackle hangers, d-rings, and reciever. I wanted the tailgate flush w/ crossmember, so I had to notch tailgate so it would actually open. To shorten the bed...just make a few marks where you want to cut, close your eyes, and pull the solvesall trigger; then weld it back up. In my case, that whole process involved alot of cussing in between.
Hope that helps.