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3.31 and Speedometer Cal.

1K views 2 replies 3 participants last post by  Deeznutz2020 
#1 ·
My F350 has the 3.31 rear ends and came with the 18" wheels. Factory 20" were not an option with this rear end when it was ordered. I now uprgraded to 20" wheels. I went to the dealer to re calibrate my speedometer. At first they said they could do it. After about 2 hours they said it wouldnt take the calibration for bigger tires since it is not a factory option with that rear end. Not that it is a major problem, but does anyone have a fix or insight on this issue??
 
#2 ·
...I'm thinking your warranty will now go a fair bit farther than it did before...you may not want to change and just do the speed adjustment in your head or watch your GPS...:icon_ford:
 
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