I responded to your post in the other thread, but I will say it again here. $800 is a fair price for the work involved. A grimy and weepy seal is not necessarily an emergency, but it will get worse in time. When you start to see actual drips, replace the seal. The parking brake shoes and drum will be affected before the actual disc and caliper. If you want to know exactly how bad it is, you'll have to pull your brake caliper and pull the rear disc/drum and look inside. If the drum has gear oil in it, your parking brake is already compromised. This is not like the set-up in an 80 series. This is not a full float axle. It's more complicated to deal with that seal. That being said, fixing it yourself is not outside the realm of possibility, assuming you have a press and the skills to fab up a specific press tool to press off and back on the bearing, tone ring and sealing ring. I already posted a video in the other thread that shows how it is done.