I will definitely check the passenger side wheel bearings and axle. The driver side looks good.
No howling/whining noises; I was just doing a routine fluid service (recent purchase)when I discovered the mystery shavings. I hate to disassemble the pinion mainly because 1) don't have the tools (no air tools/press) and 2) the setup appears to be working well. I guess the minor risk in disturbing the setup (seal/pinion-depth, crush sleeve) is probably worth it? At a minimum I will definitely do a better check on the pinion end play and side-to-side by reinstalling the pinion in the housing (to firmly hold it in place).
Thanks for all the responses!
