Dr0idattack
Well-Known Member
I have a 2013 Expedition Limited 4x4 with Tow Package and I believe it has the 3.31 rearend. Is it possible or worth trying to find and swap to a 3.73 if I frequently tow a 28 foot travel trailer?
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When I changed my old 95 F150’s gears from 3.54 to 4.10 it turned into a beast for towing compared to before. But that’s mainly because the 351 doesn’t make great low end torque a lot like the 5.4 V8 compared to the 3.5 Ecoboost V6. The NA V8’s need more gear to get them in there sweet spot/powerband where they can make torque for the task. I wouldn’t be surprised if you didn’t also get an increase in fuel mileage because I did in the 351, about 2 mpg better on average even when not towing.The old truck doesn’t have to struggle to make power anymore. The best scenario is to have the engine run at highway speeds as close to where it makes most torque in the RPM band as you can.My 2 cents