All New Gear Oil

TL;DR - I swapped out all the gear oil in my diffs and transfer case, and some was in better shape than others.

There's nothing special about swapping out the gear oil in my diffs and transfer case, except that I'd be doing it for the first time since I installed the new Diamond Axle housing in the rear of the Tacoma, which mean that I'd be using two of the bolts that secure the third member to the housing to drain the old oil, rather than a dedicated drain plug.

A nice way to eliminate a drain plug that can get caught up or mangled on rocks that jump up at the truck.

The entire episode went smoothly, and I found no glitter in any of the Lucas gear oil from any of the components, so that was good news. In the not-as-great camp was the color of the gear oil.

From left-to-right, oil from the rear diff, transfer case, and front diff.

The rear diff was in great shape. That oil has been in there for 35K miles and looked like new. The transfer case and front diff, however, were a little muddy, suggesting a bit of water intrusion. I'd changed them both 25K miles earlier, and I'm not sure how that would be happening. I'm not blasting through water high enough to enter through the breathers as far as I know, but I'll keep an eye on it in the future. Neither had noticeable water in the mix and both were still plenty thick/viscous, so I'm not worried that anything was compromised inside.