I pull 3rd gear 4 hi..with 305/70/R16 BFG AT's and the 3.54 ratio. It's an overall good sized tire..the 285/75/R16 would be the second one. IMHO I definitely wouldn't go with the 315's because you're gonna need a lot to break them loose, and if you don't get them broke loose, better have the $$$
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