My 1999 QC 5.9L 4x4 has a a leveling kit and 33's however with a little spring sag she dont sit level anymore. I purchased some firestone air helper springs and installed them yesterday. With a few psi she sits level again and looks awesome but the rear end is WAY to firm now. When I go over a speed bump the rear end hits hard I had airbags on my 04 ram and they rode nice even when empty. ??? Any ideas what up ?

 

maybe let some air out, or throw a bag or two of concrete in the bed.

also could the springs still be hard/firm, untill you break them in? they might soften up as you use them

 

may be caused by, worn shocks,broken leaf spring, high pressure, mine rides better with 5 psi if is no loaded.
other thing is if you have stagered shocks the bags must be instaled the same way the shocks are or it affects ride and braking

 

shocks are a month old , and I have 4 psi in them now, its a firm ride lol

 

Take the air bags out and replace the sagging springs.