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Speedometer Reset

Discussion in 'General Chevy & GM Tech Questions' started by lancer, Feb 3, 2010.

  1. lancer

    lancer Epic Member 5+ Years 500 Posts ROTM Winner

    Hey guys i'm not sure if this is the right place for this but thought i'd try. I'm putting new tires on my truck and its going to throw off the speedo. Any ideas on the the best way to get it back to normal with the new tire? its an 06 silverado and i'm going from 265x70x17 to a 315x70x17. Is it something i can go and have the computer reprogrammed or something alot more? in all my old trucks i just paced someone and if it said 70 and i was going 50 i just ran 75 on the odometer and new i was around 55. but with this being a new truck i wanna be about right with everything i'm going to do to it.

    Thanks

    Andy
  2. Loggerhead Mike

    Loggerhead Mike Rockstar 100 Posts

    you best bet is getting a programmer that has the tire size setup

    gm can/will only program to their stock accessorie tires : IE stock sized tires on 20's and 22's
  3. canislupis69

    canislupis69 Epic Member 5+ Years ROTM Winner 5000 Posts

    I used a speedometer re calibrator by Hypertech. It allowed me to adjust for my 35 inch tires and for my 4.56 gears.
  4. lancer

    lancer Epic Member 5+ Years 500 Posts ROTM Winner

    i ran my truck today after i got everything done and going off my gps its exactly 5 mph off. i was worried about getting it reprogrammed but i can live with 5 mph.
  5. TRPLXL2

    TRPLXL2 Epic Member 5+ Years 1000 Posts Platinum Contributor

    On my last truck I had a pro comp calibrator which I bought for $259, and it was very simple to use. You mark a line on the ground in chalk, and extend the mark onto the tire. Move the truck forward one tire revolution, and measure the distance between the two chalk marks. You punch that into the calibrator, and it automatically compensates the differences.

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