I've read GL-4 in the trans and GL-5 is OK in the read diff. Also read some fluids have sulfur which is bad for the synchros.

Regular dino gear oil should be OK?

Maybe I'll call the Toyota dealer and get the reco. I don't have a book.

If you take the time it takes, it takes less time.
--Pat Parelli

American by birth; Alaskan by choice.
--ironbender