I also recently added larger tires(today)...265/70R-17 Nitto Terra Grapplers along with new pro comp wheels. I reset the tire size to 2521 after following the recommended formula per my instruction manual. There was a vague reference to possible gear ratio changes due to larger tire size in my manual. Should I be adjusting this value?
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2007 F150 XLT 5.4L: 3" SISO MAG: VOLANT CAI: GRYPHON TUNER
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