One problem related to ball joint has been reported for the 2002 Jeep Wrangler. The most recently reported issues are listed below.
Death wobble experienced daily several times a day. I hit a bump or uneven patch of road and death wobble begins it usually starts at 35- 40 mph. I sometimes have to slow all the way to 20 mph to make it stop. I have replaced u joints, rear drive shaft, ball joints, tires, steering stabilizer, tie rods, gotten wheel balances many times, replaced drag link and all bushings. Nothing has helped so far.