Tuner/tire size/speedometer questions

[guruerror]

That doesn't sound right...and you may be on to something with your logic.

Others may think differently...but I've had real good experiences with my local dealer and after-market mods...I would at least ask the dealer what they'd charge to reset your truck to default; then you can put the Cortex back on it.

Once you get it all worked out, push the Cortex 'Performance' program down to it...me like!