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Discussion Starter #1
I just installed new BFGoodrich 325/60R20's.
They stand 35 inches tall. My speedo is off by 4MPH according to my GPS.
My rear end ratio is 3.73. But what should I set my tire rev too?
I'll be running Inovative Diesel's, Street-Tow.
 

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The setting in the SCT only affects shifting. It changes the shift points to compensate for the larger rolling diameter of the larger tire. It will NOT affect your speedometer. You either have to get the dealer to change it(Only up to 35'), or get an after market device like the Speed Wizard.

Ray
 
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