Automatic with a 4.10

[clyons]

2007 GT...automatic...I bought a 4.10 gear for the car and I know the speedo will be off BUT is it going to screw up shift points without a calibration or tune?

 

[clyons]

Will it hurt the trans? Not worried about speedo being off. Just was thinking if it needed a tune or calibration to save the trans

 

[Three50won]

Do not drive it with those gears until you have it tuned or calibrated for them. It will throw everything off. You can damage your engine and trans...

 

[clyons]

Thanks for the advice. I figured as much!