Thank you for your comments, had g/box and diff oil changed at lexus dealer to-day a soother ride and gear change but still a bit of a jerk when it's first put into drive and occasional jerk when it goes into o/d when you ease up after accelerating but on the hole an improvement, i'll give it a while and see if it settles down. and give me time to get over shock of paying a lexus bill.
Thank you to those who helped Pheobe