Hello everyone! I have a mechanical conundrum that I need your assistance with. Okay, here goes...
My Buick LeSabre shakes BAD at 60+ MPH. It'* the worst around 75 MPH and gets intermittently better / worse the faster you go from there. I have done the following (in order) trying to resolve the problem:
- Replaced original Yokohama tired with new Pirelli tires
- Replaced original steel wheels with new 16" alloys
- Checked motor mounts and struts
- Replaced front hub/bearing assembly on both sides
- Replaced front rotors and brake pads
- Replaced Pirelli tires with new Michelin'* Primacys (as I thought the Pirelli'* could be defective)
- Replaced the front two axles with new
- Machined rear rotors and checked rear bearings for play
- Put the vehicle on a lift for inspection - nothing abnormal was found
Despite all of the above the car continues to shake on the freeway. There has been NO change whatsoever. I thought that it may be the TQ converter or transmission but when dropped into neutral on the freeway the shaking continues as it did in drive. There is also no change going into or coming out of a curve at speed. The car only has 48k miles on it! I am completely stumped and very frustrated.