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The rubber ones reduce vibration felt from engine and drivetrain more than the poly do, the rubber ones will also not pull through a rusted frame bracket or body as soon as poly will due to the poly mounts that are made being stiffer but if its rusted bad enough even rubber mounts will pull through.
The poly though will reduce body roll helping or sway found in hard cornering, and poly will not break down from high salt conditions.
GMCPaul
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