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I had thought after reading about this problem that the oil would run back to the trans after you stop driving... you mean it doesn't? it stays up there in the trans case?
Up vs. down... actually the transfer case is lower than the transmission, and the seal has to fight gravity, pressure, and shaft-pumping to keep the transmission fluid from draining to the transfer case. If the seal fails or has its effectiveness sapped by over-pressure conditions, the fluid flows between the transmission and transfer case... but unless you regularly park on an INCREDIBLY steep hill, nose-down, it won't equalize on its own.

Randii

Randy Burleson
4x4Wire Managing Editor Emeritus
Mongrel Isuzu Amigo