2002 F150 168,000 miles
Out: no idea, looks like it was changed at least once (had some blue gasket maker on it, most say OEM is grey)
In: Lucas 75w-140 synthetic with Motorcraft XL-3 Friction Modifier.
I have heard a lot of bad about Lucas gear oil (mainly due to the Amsoil whitepaper on gear lube, but that was several years old and a different oil weight). So far no issues, rear end chatter has stopped, so I am really not worried about it.