1987 325 is - Vibration after Transmision replacement

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Lance Reichert - 25 Dec 2007 04:24 GMT

Hey Folks,

I just had my automatic transmission replaced. At about 20-25 MPR
a loud vibration starts between the center console and the passenger seat.

At first I thought it was something in the passenger door, now I'm pretty
sure it's not.
It's hard to tell from the drivers seat.

The vibration sounds like a worn out fan motor. Of course, there's nothing
like that under the car.
The vibration starts at 20 mpr than completely goes away after acceleration
and does not increase in
velocity when I accelerate. It just goes away. The car and trans work
exceptionally well.

I have a call into the mechanic, and I'm waiting to hear back from him.

Any help here would be greatly appreciated.

TIA

Lance

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Bob Smitter - 25 Dec 2007 13:01 GMT

> I just had my automatic transmission replaced. At about 20-25 MPR
> a loud vibration starts between the center console and the passenger seat.
>
> I have a call into the mechanic, and I'm waiting to hear back from him.

It sounds like your mechanic seperated the driveshaft while it was out
and didn't put it back together in the correct orientation. Doing so
can put it out of balance causing vibration. A driveshaft is balanced
assembled, and the sections must not be misaligned.

Other posibilities are loose or improperly installed driveline parts
such as transmission mounts, guibo, or center support bearing.

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Ali - 25 Dec 2007 21:32 GMT

I agree, the first thing that springs to mind would be the propshaft.
Although, I would have expected more of a vibration at around 60MPH (100KM).

Of course, without hearing/feeling the noise, it's difficult to comment.
So, it could also be a vibration/resonance from the exhaust, heat shields,
etc.

Let the mechanic have a look.

> It sounds like your mechanic seperated the driveshaft while it was out
> and didn't put it back together in the correct orientation. Doing so
[quoted text clipped - 3 lines]
> Other posibilities are loose or improperly installed driveline parts
> such as transmission mounts, guibo, or center support bearing.

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Scott Dorsey - 25 Dec 2007 18:44 GMT

>The vibration sounds like a worn out fan motor. Of course, there's nothing
>like that under the car.
[quoted text clipped - 4 lines]
>
>I have a call into the mechanic, and I'm waiting to hear back from him.

Were you billed for a new guibo? It might have been a good idea just to
replace it when he was in there.

Another possibility is that the driveshaft was not reassembled with
everything lined up perfectly.

Should not be a huge deal for the mechanic to fix.
--scott

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"C'est un Nagra. C'est suisse, et tres, tres precis."

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Lance Reichert - 28 Dec 2007 21:57 GMT

Thanks so much for the feedback. looks like it was driveshaft calibration.
Problem easily solved!!

> Hey Folks,
>
[quoted text clipped - 19 lines]
>
> Lance

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