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Old 11-11-2012, 10:16 PM
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I can't say that I've ever heard a recommendation to use ATF in an M21, but I do recall Ford's recommendation of using it in a NP 203 transfer case on a Ford 4x4 in order to improve cold-weather shifting.

Those T-Cases also had a little oil pump in them as well, and I suspect that they mave have been another reason behind using a lower-viscosity lubricant than the 80W90 gear oil, which is thicker than molasses at -30.
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