So here's my problem. I've got a 2004 jeep TJ and I had a 4" lift kit installed. Now when I change gears and accelerate there's a knocking sound. (like the noise when you accelerate while towing a trailer). Accelerate slowly, no noise. Even when I'm in gear and slow down a bit them speed up it makes that knocking noise (best way to describe it is the sound the trailer makes on the towball when you accelerate with a trailer)
Any suggestions. I can't find anything loose. Top and bottom control arms seem tight. Rear shocks are tight, springs seem fine.