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As should be expected the dealer couldn't replicate the problem. I guess I'm changing dealerships. Back to square one. Happy Holidays to all.

My '14 F350 FX4 started these same symptoms at about 15k miles while driving through mountain roads in the Carolinas. Fuel mileage was in the 18 mpg range on highways prior to the thumping. Suddenly fuel consumption was 14 mpg. It felt like an issue in the 4wd, either in the hub or transfer...