Finally had a chance to change out the strut assembly... Yes this appears to have corrected the problem.. I still have a slight vibration which maybe that I need to get my tires balanced.. Hopefully I will have a 100% smooth ride once tires are balanced...

Thanks!!

Thanks for your reply... Will give that a try.. Will post what I find.. May take a few weeks due to holiday...

My plans are to replace the entire strut assembly including the mount (strut needs to be replaced anyway).. Can you point me to what and where to check for the sub frame bushings?

Thanks for the help

So I have had my 2000 Buick Regal for 5 years now and has 230K.. Car run great however the passenger side will start vibrating starting at 40MPG and higher. When I let off the accelerator, no vibration at 40 and higher.. I have replaced:

Wheel hub
CV axle
Motor mount
Tie rods
Control Arm (including ...

Were you able to resolve the problem as I have the same issue..