I posted this in Lifted and off road but received no responses. I just purchased a 2000 Silverado standard cab 4 WD with Z71 option. One of the former owners had air shocks installed but they were removed b4 I purchased it.The truck rides very harsh as if the tire were inflated to 60 psi (at 32-34 psi.). Is this normal for the vehicle or is there a different shock that I can install? I cannot read the manufacturer of the shock installed but it does not look like the springs were changed (3 leafs in rear). I have owned and worked on Chevy (and Ford) trux for many years but never driven one with this hard of a ride. Suggestions please.