did both differentials, transfer case and engine oil today...thanks to the multiple threads listing the tools, parts, capacities and torque specs--big help!
both differentials fluid was very similar in color and smell (understand that this is an art, not a science) no evidence of any water at all...both drain plugs with a dime-sized dollop of sludge, doing what they magnet does...based on my experience, fluid looked good, no concerns there at all, but no deep water crossings, and i extended rear breather last summer, so to be expected
transfer case oil honestly looked brand new...if i wasn't already set up and ready to just do them all, i would have just left as is..honestly looked like new oil--clear, honey color...my boys were playing with their friend from across the street and they stopped to sit near the vehicle while i worked this evening, and she remarked that all oil looks black, so they all got a kick out of watching the royal purple move through the clear pump tube when i refilled, and they learned something new!
i have to say that after doing my jeep TJ differentials and using RTV, the Toyota design with the drain plugs is awesome! makes everything so easy, it's really nice (other than the front diff not being accessible to my torque wrench sitting on flat ground, but that was pretty easily remedied by snugging up the fill plug then moving back on the ramps to torque to spec)