It turned out to be a broken piston skirt on #5 piston. Found the pcs in my oil pan. So I dropped the axle, pan, took everything off the top. Replaced the oil pump, gaskets, new bearings, new rear seal, cleaned manifold and exhaust, new #5 piston, then put it all back together. Got lucky and first key turn, it cranked over. Havent had problems for 40K miles later. The ZJ engine will not work. Unless you wanna do all the mods they talked about in above posts. With new mounts, I think the oil receiver is different, coil pack mounts maybe? I just know its not the same, it will require alot of mods. I did my fix for $800.
3" IRO, Bilstein's, 32" KM's on 17" Soft 8's