Can anybody tell me how to just calibrate speedo for tire size? The only way I see how to do it is to load a tune first then it gives me the option. I don't want to load any tunes, I just want to change my tire size so the speedometer is correct.

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How come there's no option to just change your tire size without tuning? The "adjustable parameters" isn't highlighted and in modified stock tune the only parameters you can adjust is trans.

Egoresb wrote:What year truck? And is it 4x4?

2015 Sierra 5.3l 4x4.

mikel wrote:not uncommon at all, thats because your 35" tires are actually 33.5" tall

Actually they're 34.7" tall

I haven't had these problems. So far I have this set up....

87 Tune
DOD/AFM off
TCM off
Throttle boost 12%
Shift RPM WOT 1-6 5900
Shift firmness WOT 1-6 8%

All drives fine normally.

When I change the tire size on the InTune to 35" the speedometer is still off. Checked with two different GPS's, GPS by phone and GPS by my radar detector. I found that setting tire size to 33.5" actually sets the speedometer closer to accurate readings. Anybody else have this issue?

What problems are you having?

Can this be an option in a future update? I would really like to be able to completely turn off stabilitrak.

Got my inTune today. Tuned my truck. Just did the 87 tune, tire correction and throttle boost @ 10%. Now my temperature on my radio shows it being 32 degrees outside. It's actually in the 80's here. What's going on?