2015 Expy HD tow, but with 3.15 rear end. Why?

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Pawpaw

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I have a '21 FX4 with the max tow option. It has the 3.73 gearing..larger radiator. Has the built in brake controller and the auto back up assist. Payload of 1769 lbs is close to what some F150's have. Towing a 25RDS Cougar that can gross up to 8800 lbs. Estimated loaded weight is more like 7500 to 7800 lbs. Expedition tows it easily at 60 to 62 mph in light winds. Running 10 ply BFG KO'2's at 65 psi cold when towing. 4 point Equalizer hitch.
 
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