Can I use ForScan to recalibrate my speedometer after gear change

[BrandonStang]

Hello, I have 2011 GT that I purchased recently and I realized the speedometer was reading higher that the GPS on my phone. After checking I found that my rear axle gears have been changed from the stock 3.31 (sticker is still on the axle) to a 3.73.

I recently downloaded ForScan and I wanted to know if anyone knows a way to adjust for the gear difference so that the speedo is correct. The version I have does not have the tire changer option in the menu on ForScan like I have seen for the F-150 or newer Mustangs

 

[Berlioz101]

I have been told that FORSCAN cannot change the gear ratio to have it affect your speedometer. I've asked in three different places but they all have said to get an SCT tuner to affect this. Unfortunately that's really all I know, I'm having the same issue, except I went from a 3.15 to a 3.31.

 

[86GT351]

No you can not