I'm sure it's a defect. However, if you read the following article
then you know Toyota is going to give you the run around in order to
save warranty costs.
No, you are not sure it is a defect, John. You are the prophet of all doom
on the groups.
I have had one tranny, GM, that started to whine after it was rebuilt. My
Dodge started to whine as it aged, and it was due to a vibrating valve,
annoying but not a defect.
Reading some patents yesterday, I found specific language about whining
due to ATF foaming (the patent for fluorinated polyethers for ATF praised
their ability to defoam these formulations).
So unless you are a tranny expert, which I sincerely doubt, you are not
The OP needs to have a competent transmission mechanic look this over.
Or just live with it, and if it fails repair it.