Have a 00 7.3. Never use #1 unless I am towing heavy up a steep hill offroad. If you came across a different ratio rear, say 2.56:1 then more gears gets you operation in the sweet spot between 1500 and 2000 rpm for different road speeds
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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