Have a look at my post in the 'Lets Talk Differentials' thread. Just put on the Ford Performance rear diff cover and I was surprised/disappointed at how dirty the factory gear oil was and how much residue was adhering to the rear cover:
https://www.fordraptorforum.com/threads/lets-talk-differentials.63576/
There was just as much on the gears themselves, and I wiped off as much as I could reach, but that still leaves probably 50%+ of the ring gear, all of the input gear and most of the spiders just as they were. Hoping the 1000 mile drain/fill I'm planning will clean up the remainder.
https://www.fordraptorforum.com/threads/lets-talk-differentials.63576/
There was just as much on the gears themselves, and I wiped off as much as I could reach, but that still leaves probably 50%+ of the ring gear, all of the input gear and most of the spiders just as they were. Hoping the 1000 mile drain/fill I'm planning will clean up the remainder.
