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Vibration during coast/constant speed

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From a prior post, list of questions that would assist someone in helping me find an answer to the vibration which occurs with my manual trans during coast.

1. Does it occur at only a given speed, regardless of rpm

Occurs at approx 50 to 55mph

2. Is it constant while the car is moving?

When car is under acceleration there is no vibration

3. Does it occur only when coasting?

Yes, as soon as I let off the gas or moderate the throttle to maintain constant speed at around 50 to 55mph

4. Does it occur only when under power, or both? Neutral or in gear?

Vibration continues even with trans in neutral

5. Did it begin suddenly

Did not notice it earlier, but has not spent much time at speeds faster than 40mph driving about town for the last several months

6. Has it gradually become worse over time?

Yes, appears to be worse.

Did check trans fluid, it was low (about 1/2 inch) so drained and replaced with new and filled to fill plug level.

Looked at Guibo and it appears to be in ok condition.

Do not hear any squealing or other noise on first drive other than standard noises

Thanks for your thoughts!!

Dennis

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Looked at Guibo and it appears to be in ok condition.

Dennis

Do NOT trust any old guibo. They look perfect until you look very close or remove them for working on adjacent items. My car's guibo looked "healthy" because it didn't have many miles on it from (2) previous owners. It was split in several places.

post-8235-13667605463606_thumb.jpg

post-8235-13667605463606_thumb.jpg

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at your rear tranny mount. A mount that's turned to black goo can cause driveline vibration as you mention...happened on my '73.

Most folks will replace the OEM 2002 mount with one from an E21 320 or even from an early 5--much beefier and only requires reaming out the crossmember mounting hole a half mm or so to fit.

cheers

mike

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sounds like a simple wheel out of balance to me.... at least that's the simplest thing I'd check first, but I could be wrong.

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