Just replaced the seal and carrier bearing in the enclosed portion of the driveline on my 1950 3/4 ton. It was doing find, no leaks until today. I noticed a drop coming off the carrier bracket. When I felt it, it was all full of think black fluid. By the way, I changed the transmission fluid with Redline Synthetic. I would assume the black is the new seal I installed but have no idea why it is leaking or apparently chewing up the seal.

Any ideas from anyone?