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O/T - speedometer correction on newer vehicles?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BurbinOR, Dec 20, 2001.

  1. BurbinOR

    BurbinOR 3/4 ton status

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    My buddy has a 2001 Chevy pickup that he will be lowering and putting lower profile tires on. Does anyone know how to adjust the speedometer/computer to correct for the lower overall tire height?

    Thanks.

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com>www.blazzinor.rockcrawler.com</a>
     
  2. CrazeeBush

    CrazeeBush 1/2 ton status

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    I believe HyperTech make their power programmers for those trucks, there is an option to adjust speedo for tire/gear changes. That's where I'd start..


    -BuSH
    '83 K5 Blazer
    '98 Monte Carlo z34
     
  3. 502Burban

    502Burban 1/2 ton status

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    Yep. Looked into this for my 2000 Silverado for the same reason, although I ended up deciding to wait until I finished with one project before starting another. Easiest way I've been able to find is to use Hypertech's reprogrammer. They market it primarily for the claimed performance increases, but it also has the ability to reprogram the trans for different gear ratios and tire diameters. Only problem is it's a little on the spendy side. There may be others out there that will be able to do the job, too, but I haven't found them yet.

    Another idea: I suspect that the dealership would be able to reprogram the trans computer for him. Might be worth it to check if it's cheaper than the Hypertech item.

    Robb
    <a target="_blank" href=http://community.webshots.com/user/robbrj>'73 GMC Suburban - 502DFI</a>
     
  4. BurbinOR

    BurbinOR 3/4 ton status

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    Thanks guys, that was what I suggested to him (the Hypertech programmer) but that idea of asking the dealership for the help is a good one. This dealer is awesome, has the best and cleanest service area in the state..........and will do high performance stuff, so they are usually up for stuff like that.

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com>www.blazzinor.rockcrawler.com</a>
     
  5. 502Burban

    502Burban 1/2 ton status

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    Glad to help. I think all they have to do is plug in and re-flash an EPROM or something of the sort. If you check with the dealer, let us know what you find out if you get a chance. The info may come in handy down the line if I end up changing my wheel/tire combo.

    Thanks,

    Robb
    <a target="_blank" href=http://community.webshots.com/user/robbrj>'73 GMC Suburban - 502DFI</a>
     

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