I've got new rear springs in my car now, it was the 4 piece kit that Spohn used to sell. I was under the impression they were factory replacement for IROCs. It seemed to start wheelhopping at that point and I want to try some different springs. Whats a good spring to try?

 

You shock are probably not valved correctly or worn out and can not control the new, stiffer spring rate. That is, of course, assuming that you have an otherwise tight rear suspension and decent torque arm.

 

The only thing stock about the rear end is torque arm. All bushings are new poly in aftermarket arms. Shocks are new Konis.

 

The I would suggest adjusting the shocks 2 or so clicks tighter and go from there.