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Discussion Starter #1
I'm looking for a used axle out of a junkyard. Found an 09 charger with automatic but don't know what engine was in it. Diff has a tag that says 3.90 but I thought 3.92 gears were manual trans only? Any way to know what ratio is in that axle?


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3.90's appear to have been an option for some of the Automatic V6 2009 chargers. To be honest I couldn't tell you if the charger/challenger axles are straight swaps, especially from a 2009 to 2014. Maybe someone else can help with that.
 

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3.90 ratio was in 4 speed automatics with 2.7 engines mostly. The swap is only good for V6 challengers up to 2010. I think what you want is a differential, not an axle like you posted... Correct???
 

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Discussion Starter #5
Yes, diff and axles from what I understand. So there was a 3.90. Wow...no that won't work for the ridiculous OD ratio on this car. Thanks guys.

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The two most common swap ratios that are used for the V6 are 3.64 & 3.90.
 
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