I need some help diagnosing a problem with my wife's 98 Durango 4x4 with 360 and the selectable part time and full time transfer case. Anyway, when turning left or right or stopping or accelerating from a dead stop a popping noise is coming from what feels like the steering column. Like up under the dash or on the inside of the firewall. Also, I found a clean gray or silver bolt that was broken in half under where the wife usually parks her Durango. The bolt was around 1.5 inches and had a locking nut on it. I don't know for sure if this came off the Durango but, the popping noise appeared about the time I found that bolt. I have looked under the hood for a missing bolt and haven't found one yet. I haven't removed the plastic under carriage covers yet to see if that might reveal a hole somewhere in need of a bolt with locking nut. The steering wheel and column do not feel loose. The popping noise also seems more pronounced after the vehicle is heated up or it is above 60 degrees outside. The steering pump does have a little whining noise and I have had the wife turn the steering wheel left and right repeatedly while I watched the power steering and linkage move. No audible popping while that was going on either. I'm just before taking it to the dealer and letting them try to find the source of the popping. Any help here would be much appreciated.
Ben