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I have 4.10:1 in my '02 . I am now running 265/75/16 tires and rpms @ 75 mph on the freeway are about 2300 in overdrive. with 235/70/16 tires the rpms were 2500@72 mph.
I re-geared the truck a couple of years ago for towing. No complaints on gas mileage, being it is a truck. I have the 4.6 and get about 12-14 city driving and about 15-17 highway driving
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