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Speed difference

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 6.2L Jimmy, Jun 30, 2002.

  1. 6.2L Jimmy

    6.2L Jimmy 1/2 ton status

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    Location:
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    Hey All,

    Can somebody tell me the speedometer difference after adding 33x12.5x15 BFG MUD TA. The Jimmy has 3.08 gears and a 700-r4 with shift-kit and cooler. Thanks,
    Mike
     
  2. Tweetysuarus

    Tweetysuarus 1/2 ton status

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    The easiest way is to take it to the local speedo calibration shop and let them regear your setup. Thats what I had done when I had 4:56 w/ 38.5's installed on my rig. /forums/images/icons/grin.gif
    Bill C
     
  3. BlazerGuy

    BlazerGuy 3/4 ton status

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    Or if you have a GPS or a friend with a GPS, you can set that thing to MPH and compare it to your speedo for an exact reading.... /forums/images/icons/smile.gif
     
  4. txbluethunder

    txbluethunder 1/2 ton status

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    i believe its about 6%
     
  5. trailblazer87

    trailblazer87 1/2 ton status

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    Madera, CA
    I just had my brother pace me, we talked back and forth on cell phones and were able to plot how fast i was going in comparison to what my speedo was saying, easier, cheeper, and took about 20 minutes of rural driving /forums/images/icons/laugh.gif
     
  6. behemoth

    behemoth 1/2 ton status

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    Location:
    Northwest Florida
    At 55 mph with Interco TrXus 33x12.5R15's, my actual is 64 mph. Did the unscientific 'highway test'
    with two-way radios. I don't have a clue what my gearing is. I'm going to take it to a calibration
    shop to remedy the difference. /forums/images/icons/tongue.gif
     

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