On my 1996 350 4×4 the rear main seal is leaking. I read that may just be the rear yoke bolt being loose. Hopefully that is it. I am wondering though does the oil from the seal area come from the engine oil or is there a separate oil supply for the transfer case? As I look at it it appears it would be the engine oil so I better take care of this soon so the engine oil doesn’t get low enough to seize.