vibration in 2000 grand prix gt

I have a 2000 Grand Prix GT and it has developed a nasty vibration but only when turning to the right under acceleration and when I am travelling straight over a slight uneveness in the road which makes the suspension load up and the car bounces a bit.... turn to the left everything is fine. it is progressively getting worse. I noticed the driver side CV boot leaks grease so do you think that may be my problem? someone also suggested a bad wheel hub but it does not make any noise like a bad bearing would. you feel the shake in the drivers seat as well as the steering wheel. it has new tie rod end,upgraded GM sway bars and new lower control arm bushing recently. also new goodyear assurance triple treads and even had then rebalanced.
any suggestions?
Thanks

What is your mileage?

Either a bad axle shaft including inner and outer CV joints or a bad hub with worn out bearings could cause your problem. I would check into the leaking grease problem at the driver's side axle shaft.

milage is about 153000 kms which I believe is around 90000 miles or so. we put the car up on a hoist and pinched the passenger side brake line off to make the driver side wheel spin and it really made it shake. no noise like a bad bearing though. I'll try a new driver side CV shaft and see what happens. passenger side didnt shake when we tried it.

Sounds like a good plan. Mileage isn't too bad but the failure is premature. I recall certain 2000 model Grand Prixs had issues with axle shafts.

Good luck and let us know how it turns out.

Turned out to be a bad CV joint. put new struts on as well. nice and tight again.