Trans screeching on hard 2-3 shift?

[GAP]

I noticed today that when I shift hard at WOT I get a screech coming from what seems like the tranny. This is a stock 3650 in my nearly stock 07 GT. Before the cruise on Saturday it didn't do this. I'm assuming it's the clutch or throw out bearing going out.

[greenbullitt]

belt slip? this is usually what i encounter...

[91CoupeMike]

Ive seen a 3650 do this on a 600rwhp car. It would do it going into fifth.

[GAP]

Thankfully, the tranny isn't behaving any differently besides the noise. The clutch engages kind of softly, but it has been that way since I bought it almost 3 years ago.

I'll investigate the serpentine belt tomorrow too.

[91CoupeMike]

My theory was the internal "brakes" in the transmission.

It's Cone shaped and is used to slow down the syncro so the don't grind..

I'll try and find a picture of what im talking about because I'm doing a horrible job at explaining it.

But that's the only thing I could come up with, even though I've never heard of them making noises, but to me it made sense.

[91CoupeMike]

[91CoupeMike]

[greenbullitt]

you wont hear a blocking ring

[91CoupeMike]

you wont hear a blocking ring

Thats what I thought, it was just a threory.

I've heard this before and it didn't sound like belt slip, but the only belt slip I've heard from torque was a v belt. Maybe a ribbed belt sounds differant.

[Beenfetchedlately]

Clutch disc spring harmonics.

[GAP]

I've ruled out the serpentine belt. It's most definitely coming from the trans. Should I put slicks on and see what breaks, just replace the clutch, or just dont worry about it?

[GAP]

This morning and this afternoon I couldn't get it to do it. I guess I have one of those self healing transmissions.

[thesource]

The TR3650 is well known for having syncro issues on the 3rd gear. You wouldn't hear the noise you described though, it would be more of a slight grind at first that gets progessively worse over time. Eventually you destroy the carbon liner on the ring and the 3rd gear side of the 3-4 slider.