First build diff questions
 

First time with gear diffs, so...

How much oil to put in, was thinking just covering the gears?

Also, what/how much grease on the diff ring gear/pinion, I only have Tamiya greases so it's either ceramic or anti wear or molybdenum grease??

Just up until the planetry gears are covered will be fine. :thumbsup: Run through the gears by hand to insure there is not an air pocket and top up accordingly.

I fill them just over the cross shafts that hold the small satellite gears in place.

Molybdenum grease would be a good choice Dave, I run a small 1mm thick ring around the main crown gear of the diff, install and then turn the diff around the pinion to coat them both evenly.