My tranny will make a buzzing sound when it is ideling in park, but as soon as I give it a little gas the sound goes away, when the RPM's drop back to normal it reappears. What could be causing this buzzing sound??

 

I think an excesive clearance into Torque Converter Clutch or a bearing.

A right diagnose must be made with NEW fluid at FULL mark.

You can wait the next months. If the buzzing sound increase, you can review the TCC in a shop and evaluate change it for a remanufactured part. (A new TCC is for a possible complete overhaul in the future).

Regards,

Denis V.

 

I just changed the fluid and filter and the sound hasn't gone away

 

I think that can happen if the gasket on the filter did not seat, or if it tore.

 

Make a small list:

What parts/things movement changes when you give a little gas? :

(In park/neutral):

- TCC
- Bearings
- The fluid
- Oil pump
- ... You add:...

It happens in park only?. In neutral is the same or not?

Regards,

Denis V.