09-24-2009, 07:33 PM | #1 |
Senior Member
Join Date: Aug 2004
Location: Kelso,Wa
Posts: 3,637
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Speedo Calibration
A guy I work with has either an 06 or 07 (he's not sure,the door says 06,title says 07) 1/2 ton 4wd. He is wondering what he needs to do to get the speedo calibrated after putting oversize tires & wheels on it.
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09-24-2009, 11:13 PM | #2 |
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Join Date: Jan 2003
Location: Denison, Texas
Posts: 1,919
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Re: Speedo Calibration
His door may say 06 meaning it was manufactured in 06 for the 07 model year. Usually anything on or after Aug will be for the next model year. My 98 was manuf in 12/97. As for his tires, this should be something the dealer could handle or anyone who has the ability to adjust the tire size in the computer. You can also purchase something like the hand held power programmers or send the computer out to be redone. The dealer may be the cheapest option, especially if you can talk them into maybe just charging for just a half hour. I can't remember what criteria they will need to make the change, but just to be safe, get the tire size, revolutions per mile (should be available from tire manuf web site) and tire outside diameter (also should be available from tire manuf web site).
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1998 GMC Sierra SLE 1/2 ton 2WD 305 Vortec -Gibson Stainless Cat Back Swept Side -SS Wheels 2005 Honda CRF250R 2006 Honda CRF150F |
09-25-2009, 12:04 PM | #3 |
Charlie Daniels w/ a Tq Wrench
Join Date: May 2009
Location: Statesville, NC
Posts: 1,570
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Re: Speedo Calibration
Dealer can do it, although they are always reluctant, and alot of techs don't know that they can do it with the Tech2. But if the truck is out of warranty by now, he may be better off getting a custom tune for the truck (I recommend Black Bear Performance). And by this I don't mean one of those crappy handhelds like hypertech or superchips, I mean EFI live etc actually custom tuning the PCM. This is actually cheaper, although a little less convenient than a handheld, but they can correct speedometer, change shift points for the change in tire size, as well as add a good bit of hidden power potential and fuel mileage gains.
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09-30-2009, 04:20 PM | #4 |
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Join Date: Sep 2005
Location: sc
Posts: 1,203
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Re: Speedo Calibration
There are options for changing the tire size.
He can either have the PCM programmed by someone to make that change (and more if he wants) or buy a programmer to make those changes and others.
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09-30-2009, 09:30 PM | #5 |
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Join Date: Aug 2004
Location: Kelso,Wa
Posts: 3,637
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Re: Speedo Calibration
Thanks, I'll pass the info along to him. He will have to take it somewhere, he does not even know what a wrench looks like.
He just knows he a bought a truck that looks cool with a lift kit & big tires.
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