Gear swap from 373 to 331 Issues?

[2016s550gt]

So I have a 2016 Mustang GT PP. I swapped out my 373 gears for 331. They have been on for a few months with no issues. Recently my car doesn’t want to rev past 3k rpms. If I keep the pedal down more than 10 seconds then the power will start to gain speed and go past 3k rpms. Ford said is because the gear swap??

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[Cobra Jet]

I’m pretty sure you have to adjust some values pertaining to the rear gear ratio in the vehicle’s computer using Forscan (or have a Dealer do it if you don’t have the tools to do it via Forscan).

 

[stang1971]

turn traction control off and go drive it... if that solves the issue, you need to adjust the value in the bcm.

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