Check alignment, wheel bearing tightness, steering shaft(Coupler, I think it is called) , rod ends, steering column bearings, frame cracks, suspension, and steering box is last on the list. A guy made a great post on this forum on that subject, maybe somebody can find it.
'85 CJ-7, 258/4.2L 6cyl. Bought new in 1985. Full cage, Warn 8274 winch, Ford 9" rear, front/rear Detroit Lockers w/4:88 R&P. T-5 tranny and 4:1 t'case. 33X12.50-15 BFG/AT, MSD ign, on board air---
If ball joints, bearings etc ck out ok.
Most of the time it's either the CV joint at the bottom of the steering column shaft or the 'u-joint' near the top.
You really need to have this ck'd by a 'pro', if it's really bad-YOUR DANGEROUS to others on the road.
ALSO-You really should get a copy of the REAL Factory Service Manual(NOT Chilton or Haynes).
You really should fill out the info on your jeep so it's easier for us to help YOU--
LG