i was helping someone move today and had the tailgate down and lightly bumped a power pole just hard enough to put a small dent in the top of the tail gate now it closes a little hard and the passenger side is off a little,i guess it gives it charactor. i wiil try and tinker with the hinge on the passenger side. my truck has a 4.0 engine and is closing in on 100,000 miles and i bought it used how do i find out if the timing chain has ever been changed?:serious: