what tire diameter to I program (I have 2 different wheels)

[colocowboy55]

Hello I have a 2000 Camaro SS with 6 speed and 3.90 rear end gears. I also Have 2 different size wheels. Fronts are 245/45/17 with a diameter of 25.6 inches and rears are 275/40/18 with a diameter of 26.6 inches. What diameter should I use when programming with the Diablo? Also does the performance programing automatically disables the 6 speeds skip shift or do I need to manually put that in? thanks Jason

[mikel]

You need to input the rear tire sizes.
You can use the tool to disable the skip shift feature.

Thanks