Sounds like you need to replace the lower bushings. A complete kit of polyurethane run about $50, and the cost for a new alignment, providing nothing else is worn. Here is a link Bushings

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed