Originally Posted by JimC

Sorry but you won’t find (or “fine” sic) such a tool. The speedometer is built into the tuning parameters. So the only way to change the speedometer is to go into the tune and adjust what the computer is reading.

Originally Posted by JimC

Sorry but you won’t find (or “fine” sic) such a tool. The speedometer is built into the tuning parameters. So the only way to change the speedometer is to go into the tune and adjust what the computer is reading.

Originally Posted by AK_Kayaker

Wonder what happened after 2010, cause Hypertech, Ford Racing, and others made various speedometer recalibration tools, but none are listed to work after 2010 model year.
To bad the OP can't just find some 18" wheels he likes so he could get his more cushy sidewall height, without the hassle of trying to fix the speedo.

Originally Posted by Mr. D

Any recommedations for an inexpensive OBD Tool that I can use to correct speedo readings? Thanx in advance for any help!

Originally Posted by Derf00

Wheel size has nothing to do with it, tire height (diameter) does. You can have an 18" rim and a 20" rim with an overall tire height equal to each other and you would see no difference in your speedo.

If you do get a tire with a different height then yes, a simple adjustment via a handheld tuner is what is needed.

Here's SCT's instructions for example: http://www.sctflash.com/PDF/64Options.pdf

Your dealer is probably strictly by the book so they won't even mention an aftermarket device like the SCT tuner to access the ECM for the adjustment.