Thanks to those that looked at the thread! B)
Just in case anyone is interested we have a result
We have official confirmation now from LEXUS technical HQ that the vehicle was not designed to EVER run in 2WD mode - So looks like we will have to find a 4WD rolling road or try to do the work on the test track
So thanks anyway RX300 guys - lovely cars you have by the way! :winky:
Mick