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I'd think the 3.31 axles would bet better than 20 as I can squeeze 20 out of my 3.73s.
Where we live & with the type of driving we do, I would bet money we would get better mileage with 3.73s than with the 3.31s. Wife's is a 2010 4x4, 3.31s & 20s and 6th gear is a joke. It shifts in & lugs then you hit an incline & it drops a gear. I'd give anything to have something lower in ours. The part that that's really sad is it has the "heavy towing package".
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