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The transfer case uses the splash and oil bath method for oil circulation, which means no pump to spray oil on top of the gears. When in 2wd you dont get a lot of lubrication to the 4hi/lo gears (4 hi/lo dont spin unless their meshed to a drive gear) so it's not a bad idea to run it every once in a while to put a fresh coat of oil on the gears and bearings.
 
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