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  1. #1

    Cool Calibration fro new tires

    Hello my Name is Anthony I just put 275/75/18 BF Goodrich All Terrains on my 2004 Silverado with a 3" body lift. My speedometer is off by 1 or 2 MPH. Do I really need to calibrate the computer to recognize this . Will the shift pattern do any damage to my trans. If so help...........................

    Thank You

  2. #2


    1 to 2 mph is not going to effect much. I have OCD so that would bother me by being off. I installed a superlift speedo calibrator on mine. it is installed inline and can be tweeked to get speed correct. otherwise programmers will do it based on old to new tire sizes.
    2004 Silverado 2500 Crew Cab 4x4, AMSOIL EA air filter, Granatelli MAF sensor, Throttle body spacer, Magnaflow exhaust (true dual to 2 in 1 out muffler), 6" ProComp lift (add a leaf and 5" superlift rear block), Bilstein shocks, 35's (Cooper Disoverer ST) and 4.10 gears, Rhino Liner, EGRUSA fender Flares and widow visors, extended stainless steel brake lines, firestone airbags w/onboard air compressor, Pioneer Avic X940BT navigation, Accel backup camera.
    1960 Land Rover Series II 88
    2001 Pontiac Sunfire
    2013 Toyota Avalon Limited (Wife's Car)
    NRA Life Member

  3. #3


    You should be fine with 1-2mph off. The factory computer compensates I believe up to 10% for tire size. The factory knows some people are going to go to a differant size tire. Most speedo's are off alittle from the factory.

  4. #4


    Thanks Guys............................

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