2008 Chevy Silverado Option code for tires from Medium duty

Tiny
VARTZ04
  • MEMBER
  • 2008 CHEVROLET SILVERADO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 18,000 MILES
I need to change the rear end gear ratio in my truck, I have put bigger tires on it and the 3.23 stock gears aren't cutting it.

I am putting 4.10 gears in it. I was told by a dealership that they could not adjust the gear ratio in the new trucks pcm but tire size could be changed.

My idea is this, put a big enough tire in the computer to make the truck seem like its still running the 3.23 gears. That means a 38" tire, they just so happen to ahve this option in the C5500's its option code XTU.

that is a 265/75/22.5 tire, Can this be downloaded using the tech II scanner to a silverado PCM
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Monday, October 12th, 2009 AT 9:38 PM

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Tiny
BRIAN 1
  • MEMBER
It could, the tech 2 will change the tire size in the special functions part of the tech 2, it will just recalibrate the EBCM to read a faster or slower wheel speed. But a tire that big might not be an option in the tech 2. There are only so many sizes to calibrate in the tech 2. I guess you could try it. Sometimes you need a VCI number from GM to calibrate it, if that option is avalible.
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Tuesday, October 13th, 2009 AT 6:16 PM

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