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this has been discussed several times on the board and from what I can tell the rubber is the winner when it comes to cab, radiator support mounts. Poly is good in sway bar, trailering arms etc. Everywhere else rubber. The rubber will flex more and not transfer the jar that the poly will. I'm sure all the opinions will be posted again.
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1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021.
"I can't complain, but sometimes I still do. Life's been good to me so far."
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