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Well in fairbanks, where -40 and colder for days isn't uncommon synthetic gear lube was almost mandatory. Transmissions and transfer cases that used ATF were generally fine with what came in them as long as no water got in over the summer. Strange things happen at those temps, square tires, frozen parking brakes, dragging front tires due to thick grease, and anything that's been neglected will probably fail.
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'07 F250XL 5.4L Superchipped and flowmastered
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