Rubber- works great, lasts along time, fairly cheap
Polyurethane- squeaky, cold flow properties result in control arm bushings taking set in oval shape leading to slop, no real improvement over fresh rubbers
Polygraphite- same cold flow issues as previously discussed with the added benefit of introducing a compound NOT compatible with urethane. The result is the graphite breaking down the urethane over time.
Teflon/Delrin/Nylon- eliminates all bushing compliance, lasts forever, not terribly expensive, impervious to the elements, no NVH issues.
Basically the Teflon option has zero drawbacks and lots of advantages.
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Dennis
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