Calibration fro new tires

Discussion in 'Wheels & Tires' started by Megs_87, Mar 20, 2011.

  1. Megs_87

    Megs_87 New Member

    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. dsfloyd

    dsfloyd Epic Member 5+ Years ROTM Winner 1000 Posts

    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.
  3. silveradotrailblazer

    silveradotrailblazer Epic Member 5+ Years ROTM Winner 5000 Posts

    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. Megs_87

    Megs_87 New Member

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

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