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I am right at 2900 rpms at highway speeds. You will still be higher than 2500 with the 3.73. If I did a lot of driving on the highway I would have gone with the 3.73. At the time the 3.73 was over $1000 more.
 

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I am right at 2900 rpms at highway speeds. You will still be higher than 2500 with the 3.73. If I did a lot of driving on the highway I would have gone with the 3.73. At the time the 3.73 was over $1000 more.
I got a question I have a 2012 challenger rt auto it has the 3.06 open diff I got a good deal on a 3.91 lsd now to do the upgrade I know I need axles but I was told I would need hubs too is that only for the older models or will I need it too ?
 

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Any time you go from Open to LSD you need hubs, axles, coupling and possibly more.
You will need an after market Tuner to change the Ratio programming or you will toss DTC codes and go into limp mode.
The last I heard dealerships will not change your gear ration programming. I use HPTuners.
 
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