[Artofdeath]

Sounds like a leak around your rear end gasket cover. Scrape it all off, remove the cover and replace the gasket. I took a roll lock to my gasket surfaces both cover and housing and used a new gasket and sealer then I filled with non slip 80-90w rear end lube. While you have the cover off you can look at the gears to see what ratio you have. Many threads here on how to identify.

Not to sure about ping when adjusting idle screws. Hard to hear ping at idle imho, unless timing is way out. What you should listen for is the engine starting to stumble. Turn screws in until it starts to stumble then back out a half a turn.