1987 325 is - Vibration after Transmision replacement

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

"Lance Reichert" wrote:

> 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.