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Yes, my opinion is that gearing changes could dramatically improve the V6 4x4 manual fuel economy. Note there are no taller differential gears that will fit the 4x4s because of the front differential. The 3.73 already in the V6 4x4 is the tallest offered for the front. The only taller gear sets are only for the rear differential. Barring having custom gears ground or modifying your differential somehow, the only real “bolt on” option for taller gearing would be swapping a transmission.
For a V6 4x4, you would probably need to use the URD T56 Swap Kit with a Rockland Standard Gear Tremec T56 6 speed transmission for 4 wheel drive pickup trucks. This transmission will have 5 or 6 bolt flanges with 27 or 32 spline output shafts to accept Chevy, Ford or Dodge transfer cases.
Obviously none of this would be cheap! Possible doesn’t mean practical.
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