Mines dropped 1.5" (any more and I would be ripping up the front clip)and I bottom out on most larger bumps etc.. so 3" you definitely will, nothing you can do except spend the money on a full coilover suspension. Coilover springs IMO are way to short to do any good, it would have been fine if they give you an extra 6" of spring and a longer collar, then it would be much better. guess Ill just have to make my own set, there is a machine shop by me that makes springs etc.. if I tell them the spring rate length etc.. they could whip me up some longer springs and a longer collar, but that might cost just as much as a full coilover setup

1998 dodge avenger 4 cyl AT
Mods are:
Not enough