Hey All, I went to go change the oil in my differentials today. the front one looked ok except the fluid seemed pretty dark and there was some sludge on the bottom of the pumpkin I scraped out...the rear one actually started draining what looked like normal fluid then it became a thick almost pudding like substance. I'm assuming it's emulsified oil and I scraped as much out with a silicon baby spoon but it looks like there is still some sticking on the pinion, etc... I have seen on some forums that recommend running diesel for a couple miles and draining but in my particular case the truck isn't running at the moment. Would it be possible to simply jack it up, fill with diesel and hand rotate the wheels or is that just not going to get enough movement to clean anything? Also I would assume you wouldn't want to fill it all the way so the diesel doesn't seep into the axles? Oh...and I found this little gem on the magnet on the cover. It doesn't look like anything is loose, could it be someone simply screwed up and left it in the case in doing something else in there previously?