SPEEDOMETER OFF

RichardT · #1 (**permalink**) 10-03-2011, 07:52 AM

OK went with 35" nitto trail grapplers, wait to install lift very soon, I' think my speedometer is off, My GPS tells me i'm doing 70mph, but my speedometer tells me 65. Putting on larger tires in the past on older trucks would always throw it off but on my 99 it did not throw it off. Am i right on my speedometer being 5 miles off? is there a correction for this. No big deal just wondering. My odometer is right on the money according to the GPS. and its never been very far off before. Anyone experience this?

**Dave** · #2 (**permalink**) 10-03-2011, 07:55 AM

Yup its off. Either take it to ford and have it corrected or find someone with AE to do it.

RichardT · #3 (**permalink**) 10-03-2011, 07:57 AM

OK, WHATS AE? what kinda process are we taking about here. I mean will this take awhile and cost me ?? or is it an easy fix and throw a few coins at it?

**Dave** · #4 (**permalink**) 10-03-2011, 08:00 AM

AE is Autoenginuity. Its a diag software. Its about 400 bucks to purchase. Unless you know someone in the area with it.

Ford can do it for about 50 bucks. But FYI Fords spec is 3 mph off is ok

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