Re: 2002 Crown Vic LX shocks help
You are somewhat limited with shock selection if you have rear air springs, but KYB gas adjust shocks (set on firm, front and rear) firmed up the handling on my '02 HPP Gran Marquis. The KYB's will also help prevent bottoming.
P 71 springs and sway bars (expensive new, but check the bone yard) will really make a difference, but use new KYB's along with the springs. You can really improve the handling on a Panther chassis car with these mods. They stop the sloppy wallowing feel and seem to make the car track better at freeway speeds. Experience has taught me that cheap shocks are a waste of money.
(Sorry to chime in so late to this post, I have been in an area with limited e mail access for over a month)