Shimming in front at around 55 mph, seems more on the left side. on 2003 Dodge Ram 1500

Truck has 113,000 miles. Already replaced bearing hubs, rotors,no lock up on calipers. Tire all look good, no uneven wear. The left side of the rack and pinion has a minor leak. Upper bushings look good, ball joints look good. Lower control arm busings, the front ones look fine in front where they come out the back is the rubber is looking a little flat. The back bushings in the rear part of the arms look good on each side. Also looking for an idea on cost if I need to replace any of these. Thanks

Asked by for the 2003 Dodge Ram 1500
check for shifted belt in one of the tires.