After completing SOA on my '82 fj40 using the springs from man-o-fre a few weeks ago, I been chasing a problem and figured I'd better stop and ask for directions. By not using the original springs it gave me nearly 2 in extra lift and figured I'd turn the axle and point the pinion to relieve stress on bottom u-joint. I've since shimmed it back (thinking it may have produced a harmonic issue) and cut the angle in half and it still hasn't solved the problem which is this. A test drive produced a bad vibration and found there was slight binding in the shaft knuckle and it had to be taken back out and fixed. After reinstalled, another test gave way to a similar problem. Check and replaced side and spider gears and pin not making a difference. Pulled it in garage, jacked up one rear wheel with dif cover off let it run in gear at idle speed. Shaft appears to have no vibration. One of the symptoms are with one wheel touching the ground appears it wants to lock in producing a rocking motion side to side in the rear end. Its got me puzzled, my wife says burn the beast. Any suggestions unlike hers?