2001 Pontiac Grand Prix car vibrates above 40 mph

2001 PONTIAC GRAND PRIX
118,000 MILES • 6 CYL • FWD • AUTOMATIC
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MPAPP007
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  • 1 POST
my car vibrates under acceleration above 40 mph. either going staight on the highway or turning right on an on ramp, always under acceleration. never when decelerated, i have been trouble shooting this for a while and cannot figure it out. i replaced the axle, wheel hub and bearing assembly. new wheels and tires high speed balanced, it did this prior to fixing all of these items so everything has been done correctly, i even had the tires rotated and yes my lugs are tight and tourqued to specs, air is ok starting to think a motor mount or tranny mount no ideas after this.
Mar 8, 2010 at 12:51 AM
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MMPRINCE4000
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  • 8,548 POSTS
Yes, a motor mount or trans. mount is broken or collapsed.
Mar 12, 2010 at 7:21 AM