i just picked up a 90 BII last weekend. The owner said the tranny was shot, but it turns out the CV joint in the rear drive shaft broke right at the pumpkin and the drive shaft was just spinning. Super easy to replace if you find one. Just 8 bolts. I had to spray the hell out of the bolts with some penetrating lube to get them to break loose to take the shaft off. I put the transfer case side on first, then the rear. You might have to use a lift or jack up the rear so you can spin the pinion if the holes dont line up (which happened in my case). I torqued the bolts down as tight as i could get with hand tools. I think recommended is like 16 ft/lbs