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My 02 came with 4.10's from the factory and the first trip I took it on it got 20mpg!! Ever since then it has gone downhill, to the tune of about 16-18, even after switching to 3.55's. You dont have that option with AAM axle 3.73 or 4.10 and its not going to make that bit of a difference. I would say try a gearvendors but the last time I checked they wouldnt stand up to diesel torque numbers
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2013 2500 Crew/Long 6.7 68RFE NV273 stock until 2018
2011 Jeep CJ7 304/T18/D300. D44's F&R on 35x12.50's
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