Differential breather spitting fluid

[mikyFIA]

To finish this, now with 200 miles on the clock, the problem has stopped. No spitting now. I changed the fluid, at about 130 miles, drained the old fluid and replaced it with Royal Purple 75W90 synthetic. The old fluid, and BTW about 1/3 of a quart was thrown out during the first 130 miles, seemed much thicker and smelled much stronger than the Royal Purple 75W90 replacement oil. I am thinking it was a higher viscosity and not synthetic, which could explain part of the problem. My builder is checking to see what Kirkham puts in these True-Trac units from the factory, but it may be wrong for driving. BTW, my "catch can" during the testing, to keep my wheel well clean, was a freezer Zip-Lock baggie around the vent filter with the corners cut to allow air in and out but block all the spraying. It worked great, but now I don't need it anymore.