Wheel hop

Stiffer shocks. I had SS springs, low gear 904, very high stall converter and lots of rear gear using Mopar 4-speed drag shocks on my Dart. If traction wasn't ideal, they would wheelhop. Any leaf spring will want to wrap-up and then unwrap. Shocks help control this. The harder a car leaves, the stiffer the shocks need to be. Been using Rancho adjustable rear shocks with great results. I believe Calvert had them relabeled for his set-up.