I have a truspeed installed and a 5star tuner from mike on my 2000 ford v10 f250. My question is what do i input on the tuner for gears and tires if i have a truspeed? I run 4.56 gears and 33" tires. do i change it to that when i download my tune or leave those settings to stock?
Thanks

 

Input 4.56 gears and the revs per mile for the 33's into the tuner.(Mikes tunes should already have that that in) For 33's you don't even need the Truspeed. You should find that your speedo is actually more accurate with the 33" tires than stock tires. THe speedo reads faster than actual speed with the stock tires and is dead on ***** accurate (technical term) with 33's. I run 33's with no truspeed or other correction for the speedo and its dead on.(checked with two GPS and road radar things at the same time. My dads 03' has 33" tires with a corrected speedo done by the Ford dealership and his reads fast by about 1-2mph.

 

It's the same for the later years too, my factory tires cause the speedo to show I'm going about 5mph faster than what it shows.