Well, I now have a strange rear end leak. A month ago when I dropped the transmission, as I pulled the driveline, I got a few tablespoons of gear oil drip out of the front of the yoke. I also noticed the yoke bolts were damp. The main seal is dry. It's not leaking from the outer seal. The only thing I can compare it to is like when you install a harmonic balancer and don't use sealer on the keyway slot, and you get an internal leak from the bolt rather than the outer seal. Well, it looks like it has gotten worse and oil has slung onto the exhaust pipe and under the truck. (Gotta love that gear oil smell) I removed the driveline again this morning, and more fluid spilled out. I stopped by oreillys and picked up some rear diff permatex, and smeared some in between the flange and flange nut and then worked an o-ring in there. Pressed in there pretty good and let it cure for a coupe of hours. I'll see if that stops the leak. Anyone ever had a similar leak?? Does the diff need to be looked at by a pro? What seals the innards form leaking?