All good points. I'm also concerneed about these issues but so far it has been good. I ran this diff in my b4 and sc10 and really liked it but the outdtives do get notched quicker than some. Still testing but even if I have to replace it every once in a while due to wear I will still be money and time ahead compared to maintaining a ball diff.

I don't think viscosity change due to heat is an issue since we run such short races, but adjustments when the ambient temp changes will have to be looked at. When I ran mine last weekend we started at 7pm and ran until 1am so the temp probably dropped 15 degrees and the car kept getting better every time I ran it. The bite does come up as it cools down, but I was happy that it didn't act weird as the night went on. That was running 10k. I think the main advantage will be to run lighter fluids to get corner speed up, as that's where I think this car suffers slightly to the b4.1