Yes the latest recommended fluid is now GB brand (full synthetic) transmissiin fluid. Yes, it is expensive. One important thing to remember. Doing a transmission "flush" is NOT recommended after many miles....it will disturb any particles in the botton of the pan and very likely plug up the small valve orifices. This advice is a strong one from those in the transmission repair industry. They KNOW what they are talking about. Drain the tranny, remove the pan, remove any particles on the magnets, clean the pan, replace the filter, replace the pan using new gasket, then refill. No...you won't be able to flush the torque converter. No...there is NO drain available for tbe torque converter any more.....so.....you can't drain it.
larrym3711
2001 Lexus GS 430