Quote:
Originally Posted by trooper Tdiesel
I'd expect mid to upper 20s from a inline 4sp with 2.73s with smaller/lighter then stock tires/rims, with no cargo.
The same truck with the same inline engine, with 4.11s and a 3speed auto will be hard pressed to get over mid teens. Mix in some larger tires and try and run 75+ your going to be lucky to get over 14.
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Tire size does have an influence. I remember some Korean trucks which had 15" tires all-around and single rear wheels, while the DRW versions had smaller 12" rear wheels. As the smaller wheels equated to the effect of a lower gearing, the DRW versions had a higher differential to overcome this issue.
Even though full-size trucks often had the same riding height and tire size for either 2WD and 4WD models, in theory a lower differential may compensate for a transfer case with an overdrive high range whenever that's the case. Not sure if that was the case for most full-size trucks, yet I remember some 4WDs of other types had it.