I'm going to change the fluid in the diffs. I got this info from the online manual.

The front and rear (non limited slip in the Limited correct?) take "Toyota Genuine Differential gear oil LT 75W-85 GL-5 or equivalent"

The "Transfer Case" for full time 4 wheel drive vehicles take "SAE 75W Toyota Genuine Transfer Gear oil LF" and it listed the part time 4 wheel drive with a different fluid.

I had my parts department call over to Toyota to get me fluid and crush washers for the drain and fill plugs and they had no idea what that transfer case fluid was. They claim they have 80/90 in bulk and that's what they use in all of the boxes on all of the models.

I talked to another dealer that I ordered my wheels from and they also said they use the same 75W fluid in all of the boxes.

Why is the Toyota manual recommending a fluid their own dealers don't seem to be at all familiar with? What have you guys used (again specifically talking about full time 4WD center diff)?

The specification sheet I attached below shows the centre differential/transfer case using GL-5 75w90 and the front and rear differentials using GL-5 75w85, regardless of being part-time or full-time 4WD. When I worked at Toyota everything was filled from the same barrel of 75w90. The 5 point difference isn't going to make any sort of noticeable difference. I wouldn't over think this too much, just find a good quality GL-5 synthetic and you shouldn't have any issues.

Attached Images

Fluid Specifications USA.pdf (267.3 KB, 417 views)