Up-date.
Getting ready to drop the sub-frame to install the SPL bushing in the sub-frame mounts. So I decided to drain the rear diff of fluid. Very pleased with what came out. No particles that I can see. The lube is dark, but not black. Pulled apart the screen filter that I installed in the line that goes from the diff to the cooler. Nothing in there either.
Man.......that OS Giken lube is thick.
I'm going to leave it drain over night. Oh, there is about 2,000 miles on this lube since I installed the OS Giken diff and cooler. So it was over due for a change.