Will I need to change the gears
Regearing not necessary but your computer will need to be flashed for the new tire size otherwise your speedo will be off. I think the dealer can flash upto the 255/75R-16. Won't be perfect but will be close.
i can't believe that a dealer wouldn't charge you to re-flash your computer to adjust your speedo. if you don't your speedometer and odometer will both be off. you'll just have to keep that in mind if you don't change it



