That's not a bump steer issue, bump steer is something else entirely. What you're experiencing is commonly called "Death Wobble" which is generally caused by no single cause, more a combination of problems.
A common cause is a combination of any several of the following: imperfectly balanced tires, loose trackbar (lower trackbar bolt should be tightened to 55 ft-lbs), bad/loose bushings, bad ball joints, bad/loose control arm bushings, improper toe-in (set it to between 1/16" and 1/8"), caster angle grossly off (it should be somewhere close to 4.5 to 5.5 degrees for your 4" lift), loose shocks, bent wheels, etc.
Death Wobble is a problem that exists with any solid axle so it happens with Jeeps, Fords, Dodges, etc.
A common cause is a combination of any several of the following: imperfectly balanced tires, loose trackbar (lower trackbar bolt should be tightened to 55 ft-lbs), bad/loose bushings, bad ball joints, bad/loose control arm bushings, improper toe-in (set it to between 1/16" and 1/8"), caster angle grossly off (it should be somewhere close to 4.5 to 5.5 degrees for your 4" lift), loose shocks, bent wheels, etc.
Death Wobble is a problem that exists with any solid axle so it happens with Jeeps, Fords, Dodges, etc.
