You should check with the guys at Inglewood Transmission. I know they're a transmission shop, but pulling a transmission is 90% of the work when doing a rear main seal. They may be able to help you out.
You Mr Mike. We were at your shop last week. We talked about a transfer case leak. It turned out to be the start of the rear main seal and a bad ps pump leaking oil hiding the start of the seal leak.
Anyways, we will be back at your shop just let me know when is a good time. Thankyou Mike