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Old Jun 22, 2008 | 12:32 AM
  #1  
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speed ometer is off

Can someone give me some pointers on how to adjust my speedometer since going to 35" tires. It seems to be pretty far off.
 
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Old Jun 22, 2008 | 12:48 AM
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I think you need to reprogram your PCM.
 
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Old Jun 22, 2008 | 12:55 AM
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You have a couple of options with getting your speedo redone. You can take it to the stealership and see how much they will charge you to do it or you can get a Superlift TruSpeed and do it yourself. I think the Superlift will run you around $200. You can also go to this website and OnlineConversion.com - Bigger Tires and see how far you are off and just remember that in the back of your mind while you drive.
 
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Old Jun 22, 2008 | 02:09 AM
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by the online calculator my speedometer is 10 +/- mph off....does this seem right??
 
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Old Jun 22, 2008 | 03:34 AM
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Superlift Tru-Speed is your best bet. Two settings. 1 for oversized tires, the other for stock winter sized tires.
 
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Old Jun 22, 2008 | 08:35 AM
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Im running 36in tires and have checked mine with the speed traps that cops put on the interstate and mine is around 5mph off
 
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Old Jun 22, 2008 | 08:55 AM
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The dealership can do it for the cost of labor, by adjusting the signal that the ABS Module sends to the PCM. There is nothing to adjust in the PCM.......although the tranny will shift better, and at the proper time & speed once you get it adjusted right! Or........get the Tru-speed, it can do any size tires, the dealership can only do up to 35's....
 
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Old Jun 22, 2008 | 08:58 AM
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I forgot in the last post i heared to that the pcm can only be changed for your tires like 5 times
 
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Old Jun 22, 2008 | 10:06 AM
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Thumbs up

The Super lift is the best way to do this like High Octane. Said .I am using one now for 2years it has two settings so you can switch to two different size tires if you have a need to do so. the dealer can do it. I tried that way the first time they told me it would be about 90.00 dollars and every time you change tires it might be off a little or another 90.00 dollars The Super lift is about 200.00 and it is always there to change to different tire size when you are. I am glad I went the super lift way.
 
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Old Jun 22, 2008 | 10:42 AM
  #10  
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Originally Posted by jmunkie13
by the online calculator my speedometer is 10 +/- mph off....does this seem right??
Thats about how far mine is off also with 35's
 
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Old Jun 22, 2008 | 11:18 AM
  #11  
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I recently bought and recalibrated my speedometer/odometer using the Hypertech Speed Recalibrator. Allows for tire/gear ratio changes. Works great. Also around $200 and is simple to do with no wiring. Reflashes the ABS module thru diagnostic port under the dash.
 
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