Wheel hop in REVERSE?

As long as you get your pinion angle correct and everything "else" is good regarding springs, all the spring bushings, mounts and u joints, you will fix your problem. You need to put out of your mind what it's doing in reverse and concentrate on setting the car up correctly. Like a lot have said, the car is not really even designed to back up. Sure, it has reverse and for short distances and slowly like backing out a parking place, or backing down a driveway. Slowly. The suspension is not designed to take the same shock loads in reverse as forward. If you concentrate on stopping the wheel hop in reverse only, you will be working backwards and very likely make the car hell to drive going forward. The reason for that is because everything you do to the rear suspension to stop wheel hop in reverse will work against traction going forward.