.. to go from 3:55's to 3:92s. I bought a left over 2013 1500 crew 4X4 that has 3:55s. I do tow a travel trailer and on my other Rams .. the Hemi, 6 gear tranny and 3.92's were good all around combo.
A simple front gear swap can not be done on the 2012s and newer because the ring gear is welded to the carrier. You would have to swap the entire axle with that of a 2011 or older. The rear carrier and rear gear also change in 2011 do we're limited to OEM gears and carriers just so you know. All in all I think you're looking at over $2k and it's something the dealer would not do for you.
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