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When my pinion bearing began to howl at 46,000 miles,
I swapped in a $75 set of NOS Chrysler 3.21 diff gears in place of stock ratio 3.55 in a 1995 Ram 360 Magnum 2wd 518 auto where the truck weight was 5400 lbs.

Highway mileage at 70 mph
over the exact same I40 trip from
Durham to Wilmington NC and back
went up by
1 MPG,

Thanks. What was your hwy mileage, just to see what percent, your 1 MPG is?