I installed a daystar 1.5 rear spacer back in Feb. I noticed anytime I go over a significant speed bump or large bump in the road(frost heaves back then) that when the suspension recovers from the bump there is a loud thunk. Its violent enough that you can feel it. Is it possible that I need upgraded shocks? I don't know the ins and outs of suspension but I put my rig on a lift and everything "looked" fine but obviously something is up. Any input welcome... TIA!!