Just check the model code found on the driver's side door, at the bottom under the barcode.
MCU10 = FWD (2WD)
MCU15 = AWD (4 WD)
I am having trans problems with my '00 rx300. If I take off too fast, and by that I don't mean real fast, it often will not shift into overdrive. I can pull over, turn off the ignition a sec and restart and as long as I acellerate slowly, it will shift fine. When in overdrive, I can turn the OD button on and off and it will downshift and shift back just fine as well, it just does it when acellerating from take-off or lower gears. Anyone have this problem? If so, what was the cause, and how much can I expect to pay to have it fixed (short of just buying a completely rebuilt transmission)?