According to my 2001 RX300 Owner's Manual:
Transfer Case uses GL-5 gear oil, 0.9L or 1-quart
Differential uses GL-5 gear oil, 0.9L or 1-quart
It doesn't clear state the Front and Rear differential.
A Toyota dealer changed my Front and Rear Differential, using 2-quart of GL-5 80W90 gear oil. It also stated that Transaxle and Transfer Case use the same fluid. If I am not wrong, transaxle means transmission.
A Lexus dealer told me that Transfer Case uses Type T-IV fluid. He said, " ... Sometimes the Owner's Manual is confusing. ..."
http://www.autoworld.com/RX300.htm says, "... automatic transmission with integrated transfer case ..."
http://www.carsdirect.com/research/lexus/r...00/base/reviews also says, "... automatic transmission with integrated transfer case. ..."
They mean that transfer case should use Type T-IV, not gear oil.
However, another Lexus dealer told me that Transfer Case uses gear oil, not T-IV fluid.
Very, very confusing.