2016 Mustang GT A6 - 3.91 gears

SK17

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Hello all. I couldn't really find any info on this. I bracket race my 2016 Mustang GT A6 on weekends throughout the summer. I currently have 3.55 gears with just drag radials. My question is: if I go to 3.91 gears, will I still be able to stay in 4th gear when I cross the finish line/traps? What about if I add CAI and Catback as well?

Thanks!!!
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EFI

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A simple gearing calculator will tell you that. You need to know what mph you trap now and what size tires you have.
 
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SK17

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A simple gearing calculator will tell you that. You need to know what mph you trap now and what size tires you have.
I'm trapping about 108mph with 27.5" tires.
 

EFI

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You'll be at 5900rpm in 4th at 108mph with the 3.91s.

You have plenty to go until 7000rpm.
 
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