what would my new gear ratio be, i changed the 235/75r15 to 255/70r15?

------------------
95 F-150 s/c XLT short 5.0 4R70W trans. 3.55
Cat-back duels with flo-pro and echo tips
K&N FIPK, Superchip
Accel 8.8 custom wires, accel superstock coil, accel cap and rotor
motorcraft platnium plugs
Soon top get a tint job, and then some chrome steps

 

Your gear ratio will stay exactly the same. For every 3.55 times the driveshaft spins around, your tires will still spin around once. With the taller tires, you will go further each time they go around, which will have the same effect as keeping your stock tires and changing the gear ratio to a lower number.

In some of the other threads, people have posted links which show the diameter of the different tires, and you can use that information to calculate a % change in circumfrance. If the new tire has a 5% greater circumfrance, that will effect your performance the same as changing your gear ratio by 5% to a 3.37 and keeping the stock tires. But your actual gear ratio will still be 3.55.

 

Go to www.4LO.com hope that helps....DAVE