Truck was making a clunk, finally narrowed it down to this leaf spring isolator. Can't buy it anywhere (part number isnt even listed on any GM diagrams) plus I'm too cheap and lazy to replace the whole spring for a $0.30 part.
Chock the front wheels, jack the truck up from tow hitch and hammer a chisel between the leafs to make enough room to swap these out. Takes 5 mins a side
Leaf_spring_pad.stl | 151.0KB |