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2008- 2010 Gas Engines Discussion of the gas engines available in the 2008- 2010 Super Duty trucks

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Old 01-06-2010, 10:44 PM   #1 (permalink)
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Stock tire speedometer fast

My 2010 SD V10 4:10 275/70/18 speedometer is reading 60mph and the truck is going 58mph. Verified with 2 gps's and stop watch on interstate mile makers.

My question is, can the dealership adjust the computer for a speedometer error that small, or and is it possible they have the wrong size tire or gear ratio programed?

JC
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Old 01-06-2010, 11:33 PM   #2 (permalink)
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Originally Posted by 08power2spare View Post
My 2010 SD V10 4:10 275/70/18 speedometer is reading 60mph and the truck is going 58mph. Verified with 2 gps's and stop watch on interstate mile makers.

My question is, can the dealership adjust the computer for a speedometer error that small, or and is it possible they have the wrong size tire or gear ratio programed?

JC

Great excuse to get bigger tires!
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Old 01-07-2010, 10:44 AM   #3 (permalink)
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Can't help you there, but when I installed my Diablo Sport Predator it asked me what size tires I had, told it stock 18" and my speedo has been spot on ever since.

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Old 01-07-2010, 05:02 PM   #4 (permalink)
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I have 275-70R18's and it looks like the factory put 275-75R18 into the computer. I'm going to call the service dept tomorrow.
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File Type: pdf Tires.pdf (13.6 KB, 35 views)
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