I just put 285/75/16 BF Goodrich A/T KO's on my truck that I picked up last Friday. Will my speedometer be off 7 M.P.H. or so? If so what companies besides Hypertech & Predator are out there to resolve this?

The Quadzilla tuners have tire calibration feature too!


http://www.quadzillapower.com/duramax_stealth_tuner.htm

I used the Hypertech for my speedo because it was the cheapest. I put 35" tires on.

Curious. Whats that going to do to your warranty and do you see any difference in shifting, BG

As far as warranty is concerned, basically if you bring your rig in for a performance issue the dealer won't touch it with non-stock tires. You simply have to put the stock tires on and then no problems. Not sure how the taller tire will effect shift points, but it would effect performance to a certain extent,less bottom end better & maybe better fuel mileage. Having said that, I doubt you would notice any real difference if you have also added power the programmers offer.


JPEdited by: Heartbeat Hauler