3.31 and Speedometer Cal. - Ford Powerstroke Diesel Forum
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post #1 of 2 Old 03-28-2011, 07:57 AM Thread Starter
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3.31 and Speedometer Cal.

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??
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post #2 of 2 Old 04-01-2011, 08:18 PM
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...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...

2011, F250 Lariat, Green, 4x4, 6.7L, Longbox, SRW, 3.55 gears, Upfitter switches, Moon/Sunroof, Leather seats, High idle, Rapid heater
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