My left rear sits a little lower than the right rear, especially after I sit in it, so I think it's the rear springs. Does that mean that I need to lose weight in the rear!
I really doubt if shocks are the problem. Shocks are meant to control rebound, not ride height, unless maybe someone was talking about McPherson struts, or air shocks or coil over shocks. My son's shocks were dead, but ride height was still the same, just a real loud clunking sound when hitting a bump.