Like with a 1:1 it gets filled 1/2-3/4 the way full and has a breather tube of some sort to allow for heat expansion.
So when filling the diff with fluid do you leave a little room for expansion?
I ask because its only been maybe a month maybe 6 weeks(about 3/4 gallon run time) since i switched to Erevo diffs. I noticed to night i had a snail trail on my rear diff. I pulled it apart and there was maybe a 1/4 of what i put in when i redid with 40k front and 20k rear. Just wonder if it was cause i need a lil room for expansion. Gaskets were good and the blue o rings were good, not pinched or rolled.
*after thought* I used high pressure marine grease on the ring and pinion gears