What is the F-d-d-d-d-d-d-d Vibration??

[Manolito]

1997 328 Automatic, 150k miles

80 mph or higher, a slight left curve makes the whole car shake and make a noise like it has gone off on the shoulder and hit the rumble strip - but the highway is smooth.

If I floor it in first gear, there will be a brief 1-second bout of the same noise. It feels and sounds rather as though the antilock brakes were engaging, except the car is not slowing down, it is accelerating hard.

I disengaged the ASC and tried the low gear acceleration - no change.

The sound and frequency of the vibration makes me want to focus on the antilock brake system, but that should not engage unless the brake is pressed, right? I have no warning lights lit.

Thanks for any suggestions.

[Big Evil]

Check your driveline for the all to common center support bearing blowing out. There's other stuff too but start there

[acelnah]

My car would shudder like rumble strips in second gear, up a hill at times ect.. I changed my rear breaks fixed the problem. Did not have to do anything else.

[Manolito]

This one turned out to be the front right outboard ball joint. I replaced both control arms. Tightened everything up nicely.

I was so pleased with the tighter handling that I put new control arm bushings on the other '97 as well.