Mechanics

MILLION DOLLAR QUESTION

2001 BMW 325

Shakes or Wobbles problem
2001 BMW 325 6 cyl Two Wheel Drive Automatic 180000 miles

When excelerating below speeds of 20-25 and hit 20mph, the rear-end vibrates. Best way to discribe it, it sounds like a propeller, but ends exactly at 25 and doesn't come back there after 25. Also, while traveling at normal hwy or road speeds, car makes howling noise that seems to be coming from the rear of car. The vibration comes in while in second gear and into third, but ends in third. I have a slap stick auto trans and haven't tried to leave in first to see if the noise or vibration happens because the RPMs seem to be to high at the speed it starts. I don't want to cause one more issue if you know what I mean. If anyone can help me with this, it would be greatly appreciated. Because, right now, it's just a guessing game.
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Jumac81880
September 14, 2010.




The driveshaft and center support bearing are the source of the noise. There is a bulletin for surrounding the center support bearing cage with sticky mastic to dampen the noise, inspect the bearing and stick the mastic into the region between the bearing and the tub of the car. That might do it.
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Dr. Hagerty
Sep 14, 2010.
Thank you so much Dr. Hagerty. I had a feeling it might be that, but I am known to fix everything around the problem, if you know what I mean. I can't thank you enough.

Tiny
Jumac81880
Sep 14, 2010.
No worries.

Dr. Hagerty
Sep 15, 2010.

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