So the gearbox has been making a scraping noise for the last couple of battery packs. The differential action felt bound up. Not locked but certainly tight. So I decided to open it up to see what's what. First off, holy cow there's a lot of screws! I've read reports of weak pins in the differential and gear box in general. I checked them all out and they appear to be fine. The gear box oil is black. Is this normal? This is after I used the paper towel to soak up what oil I could from the diff: And the other bevel gear: And the small bevel gears, shims and cross pin: They look ok to me. The spacers show a little sign of wear but nothing untoward. When I put it all together it seems to turn smoothly now. Could something have gotten bunged up and then freed upon disassembly? Can I safely degrease it, then fill it back up with fluid and call it good? Any suggestions on things to do to it while it's out? I plan on installing the Castle Sidewinder SCT combo. Thanks!