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is the ride hard? these trucks never rode like Cadillacs, they were a pretty harsh ride right from the factory. nothing like the plush ride of today's trucks. is the truck 1/2 ton or 3/4 ton? how many leafs are in the rear? what kind of shocks did you buy? sometimes the shocks themselves give a hard ride, depending on the type and quality.
Never had it happen to me but a buddy's farm truck had a broken shackle and they didn't know what was causing the bang till I think they went to change the tire.
Check your shocks and your shock mounts. Make sure everything in the steering and suspension is tight. Need a better description of what its actually doing though...