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I got a 07 charger and took the dif from a 2012 srt8 and swapped it to the charger. Now I have a 3.06 dif. Would It be possible to buy the ring and pinion from mopar to get the 3.91 gearing and fit it in? I got a lsd conversion kit so we won't have any problems with that.
 

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Whats the goal going 3.91 Gears? Is that a ratio that works with the Trans gearing? Curious as such a tall gear is going to kill your gas mileage. Not to mention I'm wondering if the Speedometer is going to be able to be correctly calibrated for it.
 

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Whats the goal going 3.91 Gears? Is that a ratio that works with the Trans gearing? Curious as such a tall gear is going to kill your gas mileage. Not to mention I'm wondering if the Speedometer is going to be able to be correctly calibrated for it.
Yes on all counts. Been done. Even been done by the factory (look up Mopar '11).
 
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