Some people who went with a true coil-over in the rear of the Z have not reported any problems that I know of. A couple have reinforced the upper mount area by finish welding the plate that was spot welded. most of these guys track.
To add on to what MaysEffect said. The stock rubber bushings have a lot of friction and deflection in them. By changing out to SPL parts. The suspension moves freer. There is no binding.
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