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    Gear Change Req'd for 33's?

    Bought the truck used with 33x12.5x20's on it. I noticed it has trouble staying above 70 on the hwy without downshifting (5.7L, 8-spd tranny). Other than that, it runs and shifts just fine. Roughly 75K miles on it now. I do mostly city driving with the occasional few-hour hwy trip, and Its never...
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