method for correcting speedo for gear change?

[Bomicino]

I read in another thread Tasca racing did it, a flash to the bcm? Sorry if has already been covered, I'm considering putting 3.73 in and want to know how and where this can be fixed if I pull the trigger. Thanks.

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[smokinzx14r]

I read in another thread Tasca racing did it, a flash to the bcm? Sorry if has already been covered, I'm considering putting 3.73 in and want to know how and where this can be fixed if I pull the trigger. Thanks.

From what I have read the speedo gets it's info from the wheel sensors on the 2015 and not from the transmission like earlier models ..I don't believe any of the after market hand held tuners can make this adjustment ...Ford might be able to make the change ..

I would like to know for sure also , I want to swap out my 3.31s for 3.55s

 

[Tune+]

Old post but just saw it. I change it in the tune, there is a table for both tire size and gear.

 

[Five0GT]

http://www.mustang6g.com/forums/showthread.php?t=36247&highlight=Whipple+device

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