Originally Posted by jage
Originally Posted by Ford_6L_E350
If you have a limited slip diff, don't forget the friction additive.
Brings up a question, what does the additive do to an open diff? I mean if you're not sure is there harm in adding it anyway?
No harm at all. It could cause issues in a manual transmission with synchros, but not in a diff.
(this is why Redline makes 75W90NS for manual transmissions, no friction modifiers)
I did mention "additives" in the first post.
Quigley suggested to get rid of my LSD shudder that I drain, clean out with Brakeleen, and refill.
Here is the picture of the diff: