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
have the same problem?
Monday, October 12th, 2009 AT 9:38 PM