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Very good information gaylon thank you. I am wondering if this is really whats happening tho. I have two issues with the bad seal theory and please correct me if I'm wrong.By the way, don't wait too long. The xmission will over fill the xfer case and make quite a mess.
I looked back through the PO records for my 60, and the brilliant minds at Jiffy Lube had put ATF fluid in the t-case more than once, if you can believe that. This has been several years ago, and then he took it somewhere else and they got it right.
No change in either level. That is interesting. I am leaning towards trying to fill the TC with gear oil and see how it plays out. I think you will start to see fluid moving pretty soon. Maybe by the end of a week or two there should be 'contamination'.
"The seal between my tc and transmission failed causing my transmission fluid level to be very high. The gear oil got pumped into the tranny. I also experienced transmission overheating problems after driving 100 miles because of the hot gear oil." - that is really weird. I am certain that the opposite happened to mine. Should not matter, but are you running on 2WD or 4WD and mostly highway or city? Not sure if this will help in figuring out why...