Speedometer recalibration after installing larger tires - Ford Powerstroke Diesel Forum
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Old 09-04-2013, 03:59 PM
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Speedometer recalibration after installing larger tires

Have any of u guys done this at the dealership?
I have done a quick search, and read about a lot of people getting error codes after changing the tire size only. Some claim the only way to do it is lie to the computer by telling it u are running 3.55s instead of 3.31s. (This seems like the tranny would want to change shift points)
I went from 275/70/18 to 295/70/18.
I have called two dealerships and both of them were like a deer in headlights when I said what I wanted. It irritates me when i contact the service department, and the person with the least amount of technical ability on the whole car lot answers the phone. This makes me very apprehensive to let them get anywhere near my truck.
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Old 09-07-2013, 04:51 PM
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I switched my 2011 over to 295,s and the speedometer was still accurate. have a buddy drive next to you . you might be surprised...also, your dealer must be clueless because my dealer said it is no big deal to recalibrate???
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Old 09-07-2013, 04:57 PM
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Quote:
Originally Posted by tonydumpsters View Post
I switched my 2011 over to 295,s and the speedometer was still accurate. have a buddy drive next to you . you might be surprised...also, your dealer must be clueless because my dealer said it is no big deal to recalibrate???
My speedo is only 1mph slow at 55mph, but mile markers are a good 1-1.5 10/th off from my odometer.
I have zero faith in my local service depts, but maybe it's just the people working the desks that suck so bad.
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Old 09-08-2013, 06:58 PM
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Quote:
Originally Posted by broncojason View Post
Have any of u guys done this at the dealership?
I have done a quick search, and read about a lot of people getting error codes after changing the tire size only. Some claim the only way to do it is lie to the computer by telling it u are running 3.55s instead of 3.31s. (This seems like the tranny would want to change shift points)
I went from 275/70/18 to 295/70/18.
I have called two dealerships and both of them were like a deer in headlights when I said what I wanted. It irritates me when i contact the service department, and the person with the least amount of technical ability on the whole car lot answers the phone. This makes me very apprehensive to let them get anywhere near my truck.
I upgraded wheels and tires on a 2011 F250 Super duty, it had gear ratio of 3:31 We cannot have the truck computer reprogrammed to accept 20 inch wheels and tires...you will have the dealership program the computer to accept 295/65/18 tires. The speedo will almost right on....I have never heard of reprogramming the gear ratio.....from 3:31 to 3:55. Please save yourself time and trouble....have them reprogram the computer .....295/65/18.
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