Are you talking about rear wheel hop on hard acceleration? Assuming your answer is yes, it is probably a process we used to call spring windup. Something is allowing the axel to roll forward under the car. When they reach the extreme they break traction and snap back only to repeat the process. If you have leaf springs a traction bar is a good answer. If you have coils in the rear you need to check the bushings at the top and bottom of the link that attach the rear-end to the car.
In odd cases, I have seen new shocks help but I have never seen shocks alone fix the problem. That is assuming the shocks you currently have are doing anything at all.
BTW, this activity is very hard on the drive train. It can break gears, U-joints, drive shafts, twist of an axel and just generally destroy things. Every time the wheel hits while it is spinning it applies a shock load all the way to vibration dampener. If you want to continue driving this way I strongly suggest you get this fixed. It can only get worse until it destroys something.
Email my profile if I can do more. I was a bit of a hot-rodder as a kid, about 45 years ago.
