tranny is junk but the t-case will fit yours just fine (provided it wasn't damaged from the drive shaft slamming into it if the rear axle was pushed forward. I kinda doubt the u-jount straps on the yoke would hold that long though. and the engine is pretty much as bullet proof as you can get off road. the 4.2 is one tough engine to kill. front fenders, hood, windshield frame, axle, dash, seats and all that good stuff up front is compatible as well. how'd the top and doors hold up? if the doors are full steel or even half steel you can pick up 3-500 for them depending on condition. top can net another 300 or so. If it's drivable, I'd offer maybe a 1K and see if he goes for it. If not, 5-600. Also depends on what you want to keep and what you have in yours. there isn't too much important stuff in the rear besides the fuel tank and the axle.
RIP: '88 YJ 2.5L Ax-5 NP231
Posi-Loked. Herculined. Optima yellow top. 1" Shackle, 2" BDS. Cragar 397's Aussie front.
92 YJ 4.0L Ax-15 231
5" springs, 1" shackle 31's or 35's depending on my mood