I see its the 200 series. Are you running a 10 ply tire (load range E)? If so at what pressure.

You may just need to drop the tire pressure down to around 45-50psi. If your running a 10 ply at full 80psi for daily driving your going to get a pounding.

On my CTD I had the fronts at 50, and rear at 45psi for daily use.

If I towed, or hauled, then I would air them up.

Another option is to get a lower ply tire. If you don't haul, or tow heavy loads, get something in a load range C rather then the E. This is what I did with my Ramcharger with the 3/4 ton axles.

A different shock isn't going to do much for ride quality on a 3/4 ton Dodge.