I got my truck regeared with 4.56's today and i'm running 35" tires. My speedo has been off ever since I put the 35's on in December and I have no idea how to get it back to normal. I've heard of people using programmers, but I can't find one that will work with the V6. So does anyone know any other options for the V6?

 

An SCT should work. You can adjust for tires (revs per mile) and gears. You have to play with the revs per mile. Found my 33" Terra graplers are 630 revs. Mike at 5-STAR set it up for my 35's. I used Gps to check it.