Lexus 2004 GX470 Owner's Manual page 541

CHASSIS
— AUTOMATIC TRANSMISSION
Fluid capacity
Drain and refill
Fluid type
*: Change automatic transmission fluid only as necessary.
Generally, it is necessary to change automatic transmission
fluid only if your vehicle is driven under one of the Special
Operating Conditions listed in your "Owner's Manual
Supplement/Scheduled Maintenance". When changing the
automatic transmission fluid, use only "Toyota Genuine ATF
WS" (ATF JWS3324 or NWS9638) to aid in assuring optimum
transmission performance.
526
Up to 3.0 L (3.2 qt., 2.6 lmp.qt.)
Toyota Genuine ATF WS*