Originally Posted by phozenstone
Perhaps you underfilled the diff causing the fluid to burn and become dark? I used redline as well 3K miles ago (50K miles) on both front and rear but haven't checked the fluid since. I was planning to change again at 75K.
Well I extracted 21oz and was able to pump in the entire new quart 32oz and started to overflow, so I was 11oz under, could that have done it?
I should get two new quarts and drain it all again and refill it, maybe add gear treatment to it? I don't know!
I will wait first to see what Red Line comes back with on their analysis.