Today I changed the gear oil in my transfer case, front diff, and rear diff.
Aside from a really stubborn rear diff fill plug (hooray for pb blaster and breaker bars), the job was painless.
This made filling the rear diff and transfer case a breeze. followed
this guide for the front diff, and used the same website for a guide to the rear diff.
bought new gaskets from the lexus dealer by me. All six gaskets ran me ~$18. Snagged 7 quarts of Mobil 1 75W-90, and used it for both diffs and the transfer case.
was a little concerned by the volume of fluid that came out from both diffs. definitely less than what the owners manual says to add. That being said, the drain plugs weren’t concerning- a little gunky but no chunks of metal. The fluid was very dark and smelled terrible.
without a lift or enough jack stands to raise the car and keep it level, it was a very tight fit under the truck. The front diff drain plug was a huge pain to torque to specs. Just couldn’t get in a good position to get leverage on the torque wrench.
it might just be in my head, but the car feels like it’s driving better / smoother after the fluid change.