Check the alignment on all your belts,all your pulley for same width and that the belts fit flush. Double check the work you had paid to get done. Check the track bar bushing. The C-bushing arond the axle. Mine drove PERFECT and the bushing on the driver side was gone and the one on the passenger side was half gone. Check the brace on the rear of your track bar .Where it goes to the frame.Make sure all the rivets( or bolts if the brace has been replaced) are all in and check the holes to make sure they are round--not ob-long.