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grinding noise


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does it have a 12 speed trans? of so the rear countershaft bearings in the rear section are failing. we tore out two transmissions building a steep fill stock pile, we were backing the trucks 6 -10 truck lengths up hill and that was enough to starve the rear bearings of oil on the two upper countershafts. This was a spongy fill and required much horsepower to climb..

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