You can put fox ones back on, but they will need to be longer ones.... Every company makes shocks in a variety of different lengths for different applications. The ones in the BDS kit would be longer than the ones for a stock height Ram.
Death wobble is essentially non existent on a 1500 truck as they have IFS. Death wobble happens on solid axle front ends in 2500 and 3500's.
There's lots of 4" kits you could go with. It depends on how much you want to spend. I would stay away from RCX as I don't like their 4" kit since it uses coil spacers in the rear. The Zone kit is a better budget kit IMO because it comes with new rear springs. Then obviously there's BDS, ProComp, Skyjacker. Tons of brands. If you want pricing on BDS or Zone email Bully's Performance at firstname.lastname@example.org
. Be sure to mention that you're a forum member and they'll hook you up with the best pricing available.