I have a 1941 olds and the rear coil springs are just plain saggy. I would like the rear 3-4 inches higher . I'm considering putting in airbags in place of my coil springs and hooking them up the same as air shocks. Has anybody had any problems doing this? Also with airbags do I need shocks? FYI I have replaced the old lever shocks with piston shocks but no room for coil overs.