My 35x12.5x18 wheels/tires came on my H3 when I bought it. However, my "extremely knowledgeable" [](Tongue & Cheek) Hummer Dealer told me that the Speedometer/Odometer were not calibrated for my increased wheel and tire size.

I guess my question is who can do this calibration? How long does it take? And,approximately how much does it typically cost? Are there anyNational Chains that do this?

Thanksin advance!

David

 

When you get your PCM tuned by PCMforless they can do the calibration..

 

gotta get the pcm retuned for the tire, there are currently no programmers made for the h3 where you can do it yourself, and the superlift speedo recalibration module does not work with the h3 tranny either.

 

I had the 35's put on and when I compare the speedo at 70 mph to my after mkt GPS speed indication, there is only about a 1.5 MPH difference - You may not really need any adjustment.