Release bearing/pressure plate squeal after recent clutch job

Summary: I am experiencing a constant high-pitched squeal when the truck is on that starting intermittently about 200 miles ago and is now constant. It does not go away when the clutch is depressed.

I've gotten it to start a couple times with no squeal, but it comes back and stays as soon as you gun it for any reason.

Vehicle: 2008 V6 4WD, manual transmission

I have isolated this noise as coming from the transmission, either the clutch cover or the release bearing, by removing the bell housing inspection plate and listening with a hose.

If i manually push the clutch release fork so that the bearing no longer contacts the clutch cover fingers, the sound immediately goes away.

Background:

I replaced the clutch, clutch cover, release bearing 1000 miles ago because my release bearing was chirping badly, completely dry, and chewing on the sleeve (quill?) that is part of the bell housing. This was at just over 60K miles. I used a new Aisin clutch kit and URD bearing kit with sleeve. It was fine until the sound started approximately 200 miles ago.


Suggested fix actions?

Not sure what I need to do about this one...as mentioned, pushing the clutch pedal and disengaging the clutch just makes the sound change frequency a bit.

I thought about replacing the slave or increasing preload somehow, but as mentioned depressing the pedal does nothing other than change the pitch of the squeal. Might be a good idea to do this anyway as it is probably what killed my first bearing.

Perhaps use brake cleaner on the fingers/release bearing surface to clean them and remove any lubricants that somehow got on there?

Thanks in advance...would really like to enjoy this truck without having to mess with the transmission all the time.