I have my 88 440 truck lowered & tubed axle on top of spring with no wheel hop. with the axle under spring it had wheel hop very bad.

on my stepside with NV4500 5 speed, I made some traction bars that went from plate on top of spring under u-bolts to the front spring hanger.

I drilled a hole in the front spring mount, then weld a bolt on a tube/rod for a bayonet style hook up with some shock rubber/washers.

did this on my 4x4 also, tucks the traction bars up out of the way on a axle under spring chassis.