3.31 gears at 40,000 lbs gross.
Just to give a bit of a feel for how different gear ratios would behave while towing I locked out 10 then 10th and 9th then added them back again while travelling on a straight stretch of road w...
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^^^^ What gear ratio is “better” depends on what you’re trying to accomplish. If you’re worried about overdrive clutches not being capable of transmitting high torque ..... ironically 3.31s are better. If you’re towing heavy equipment up a rough logging road .... 4.30s are going to be better. If you need duals to tow your 20,000 lb rv and want a wide track front axle you unfortunately have to go to 4.30s. If you use your truck for towing some and empty some it’s like Roy said ..... The new Powerstroke with the 10r140 and 3.31 gears can pull a house off its foundation and be capable of 22 mpg running empty down the highway.
