Quote:
Originally Posted by monzaz
This a old thread too but worth discussing...
I am sure there are more opinions...Jim
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Poly on the rear control arms is a problem. The typical GM 4-link rear suspension causes the control arms to twist slightly as the suspension moves. The factory rubber bushings are soft enough that they absorb this twisting with no problem. Poly bushings are much harder and will cause the rear suspension to bind. The solution is to use the upper arms that have ball fittings at the forward end. This solves the binding problem.