Aww, heck, I really don't know. rchippie was the original owner and put the diff oil in there.
What'd you use in there hippie? 50k?
I used 30,000 in the center, & 2,000 or 3,000 in the rear & i belive 5,000 in the FR. The mugen buggy had the 50,000 in the center. That truggy set up had a really good weight transfer.