Quote:
Originally Posted by 69gmcc10
From a handling stand point the urethane body mounts are supposed to tie the frame and chassis together and make it a stronger unit. It also is a more firm ride than rubber. For the trailing arms urethane stiffens up the joints and limits deflection of the joint, according to No Limit Engineering the only thing that should be rubber is the trailing arm mounts so there is less binding at that pivot point and everything else should be urethane for rigidity.
I have urethane cab mounts and didnt notice much difference in ride and I also have urethane trailing arm mounts and I think they are just fine, they certainly will last longer than the rubber will in that joint!
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For OE truck arms, the poly bushings are fine. For solid, tubular type aftermarket arms that can't flex torsionally like the OE I-beam can, I would not do poly.
I agree the poly cab mounts will last longer. But, if you're not seeking a roller coaster type cornering experience, the rubbers will last years & are easy enough to replace should you keep your truck another 20+ years on the road. I would think the main downfall of them isn't so much a worse ride, but increased noise/vibration levels if the truck has the pre-73 type rubber-bushed metal sleeve trype a-arm bushings.
Interestingly... my buddy recently priced some Moog a-arm bushings & rubber body mounts @ the local auto parts place only to find the poly stuff available @ a pretty decent reduction in cost from Summit. If it's cheaper to do poly, they're the way to go.