Vibration/Rumble only at certain speed

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naverillsn001 - 27 Jun 2005 18:13 GMT

My 1984 240 DL wagon recently started vibrating/shuddering like crazy, but
ONLY between 40 and 50 mph -- keep below 40, or above 50, and it's smooth.
The vibration stops, even between 40-50, if I take my foot off the gas. The
rumble sounds from the rear.

My best guess is out-of-round tire. I recently had a tranny rebuld and an
alignment (but all was fine for a few weeks after each repair). Anything
to consider other than bad tire?

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Gary Heston - 28 Jun 2005 01:15 GMT

>My 1984 240 DL wagon recently started vibrating/shuddering like crazy, but
>ONLY between 40 and 50 mph -- keep below 40, or above 50, and it's smooth.
>The vibration stops, even between 40-50, if I take my foot off the gas. The
>rumble sounds from the rear.

>My best guess is out-of-round tire. I recently had a tranny rebuld and an
>alignment (but all was fine for a few weeks after each repair). Anything
>to consider other than bad tire?

Could be a drive shaft imbalance--presumably, the shop knew to keep the
two pieces of the drive shaft aligned.

Check the support and support bearing as well.

Gary

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Gary Heston gheston@hiwaay.net
The Intel ASCI Red supercomputer placed first in the 11/97 list of
the top 500 supercomputers in the world, at 1.338 TeraFLOPs max.
As of 6/05, it wouldn't make the list.

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James Sweet - 28 Jun 2005 03:17 GMT

> My 1984 240 DL wagon recently started vibrating/shuddering like crazy, but
> ONLY between 40 and 50 mph -- keep below 40, or above 50, and it's smooth.
[quoted text clipped - 4 lines]
> alignment (but all was fine for a few weeks after each repair). Anything
> to consider other than bad tire?

Check the U joints on the driveshaft, my brother's 240 started doing that
and one of the joints had lost it's needle bearing completely.

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naverillsn001 - 05 Jul 2005 15:34 GMT

Thanks very much, folks. My Volvo guy replaced my U-joint ($120), and all
is well.

You good folks saved me from buying tires for nothing. :-)

Thanks again.

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