3.31 Auto swap?

[1320']

I know in the 2011-14 cars people found 3.31's to be the shortest effective gear with the fastest times. Given the transmission ratios have not changed, wouldn't it stand to reason the same holds true?

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[Grimace427]

There are a few considerations. Stock rev limit? Tire size/diameter? Plan to stay in 3rd gear through the 1/4 mile or finish in 4th? Stock converter? Forced induction?

 

[1320']

No I know, I was just tossing that out there

 

[Five Oh Brian]

I've had very good success running 4.10's in my '14 GT automatic, despite plenty of "experts" telling me that I screwed up by going with 4.10's vs 3.31's or staying with the factory 3.15's.

I have a 5,000 rpm Circle-D stall converter (which is now available for 2015 GT's, by the way) and run 28" tall drag radials. The extra shift (into 4th gear) in the 1/4 mile doesn't matter since my stall converter keeps the revs up high and the PCM tuning features lightning quick shifts.

Ultimately, the transmission gearing (4.17:1 first gear, for example) really helps the automatics accelerate very quickly regardless of rear end gear ratio. However, street drivability is enhanced a lot with steeper gearing, IMO, so even if I weren't drag racing so often I'd still want steeper gears.

 

[Anthony]

The problem is the gear can not be changed in the bcm/body control module yet. What does it affect? I'm Not totally sure yet, shifting in a auto for sure. Speedo, gps location,

 

[1320']

that is interesting, I didn't realize that that portion of the PCM was still locked out

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