How to Corect SpeedO

Discussion in 'Performance & Fuel' started by LURCH, Aug 28, 2011.

  1. LURCH

    LURCH Rockstar

    Can the dealer fix the speedo after I put on bigger tires or do I have to have a tunner?
  2. pmf608

    pmf608 Epic Member 5+ Years 1000 Posts

    The dealer could fix it for you, but they will only do it if you bought a size of tire that is approved/recommended for your truck by GM. Your best bet would be to get a tuner and fix it yourself. I would suggest a diablosport predator from personal experience - you can dial in your tire size, and I got a bit of a power and gas mileage increase with mine.
  3. reggiecab2000

    reggiecab2000 Epic Member 5+ Years 1000 Posts

    like he said get a tuner, not only can you adjust tire size, but many other factors as well, depending on the tuner
  4. silveradotrailblazer

    silveradotrailblazer Epic Member 5+ Years ROTM Winner 5000 Posts

    Get a Diablo Trinity or Preditor tuner. They have better tunes than the other programmers and they let you adjust more.
  5. mfleetwood

    mfleetwood Epic Member 5+ Years ROTM Winner 5000 Posts

    x3 on Diablo products....I love my Predator!
  6. LURCH

    LURCH Rockstar

    Thanks guys I have a predator for my Challenger, just didn't know which one was better for these trucks.

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