Jo,

vt_mav sent me a link to an 89 Trooper on CL in my neck of the woods. I just called about it. The guy knows nothing about the truck other than it has a 6 cyl engine, 5 speed tranny & 4WD. He didn't even know if it was a 2 door until he stepped outside to look (it's a 4 door). From what I've read, since it's a 4 door it doesn't have the 4.77s you're looking for - correct?