Well guys, after doing more research today, it turns out that with the A-body rear suspension setup, which is an inverted 4-link, you can not run a poly bushing in the upper rear control arm bushings. There is a inherent amount of binding that is naturally in this type of system due to the two different arcs that the uppers/lower arms are moving in, and there MUST be a small amount of movement at the upper rear joint due to binding. Using poly bushings in all 4 pivot points will not allow any movement, which is why my upper bushings literally exploded. I will either go rubber bushings, or to a “Johnny joint” type setup on my rear upper pivot at the 12 bolt, which will allow a tiny amount of movement. Hope this helps somebody out there.
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