I knew that Mr. Gasket had them but could not find then for a Mopar. From 30 + years ago, I remember how the SS springs would arch and the shocks could not keep up with the suspension movement, and the shocks could no longer do their job. I assume that this is still true, the longer shock keeps the tires to the ground and free from the bounce/hop.
You will need stronger shocks.. if your using
some sort of stock shocks you need a stiffer
set up to control the axle
EDIT
more than likely the hop is the shocks are too
short and once they top out they lift the axle
housing so you need to find longer and stronger
shocks or use shock extensions to try and get
the correct design length and set them up at
the length
