My 91 4matic with 135k started leaking at what appears to be the rear of the case. Big oil leak observed after driving on slick roads and engaging the 4 wheel drive. I have just spots on the floor after driving without engaging the 4matic. Is there a solution short of replacing the transfer case? I assume the engagment system is leaking into the case and overfilling and leaking out a seal.

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Handyjay