As title states, I have a *very* annoying squeak coming from under my car. It seems that the intensity of the sound grows when listening from under the car, near the transmission/engine interface.

The sound I am describing is a fairly high-pitched squeak. I've been dealing with this for quite some time, so I have a good idea of what conditions cause it to happen...
- Car needs to be warm (85*C+) for at least 5 minutes.
- Sound only starts surfacing when under very low throttle, or coasting in gear.
- It starts very faint in intensity, but if I drive for a considerable amount of time, it will grow louder. In addition to occurring under low load and no load, it will happen at idle - very loudly.
- Usually happens between idle and 2000RPM

Things I have checked:
- Shaken things under the car. Discovered that the metal panel under the transmission was loose. Also found a loose passenger side motor mount. Fixing both did nothing to fix the noise.
- Bent the heat shield for the passenger side motor mount, since it was very close to the frame.
- All pullies have been checked. None were making the noise. They aren't even near the source of the noise, but it was just good practice to be sure they were not the problem.

Any other clues? Definitely sounds like it's in the area near where the trans attaches to the engine.

Car has stock turbo's, btw.

 

could be the rubber pads that the hood is resting on.

 

DAPDAS, he stated that the noise is from under the car.

 

The sound is coming from nowhere near there. I clearly stated in the OP that it gets louder if you listen from under the car.

 

any chance of a video of this phenomenon where you move around the car, and move the camera around and close to the sound?

 

No video camera. Not going to buy one.

I'm the only thing I haven't checked down there near where the sound is, is the starter. Thinking about taking it out and rebuilding it when I install my coilovers tonight...

 

no need to get hightech buddy

someone with a decent smartphone can fix it. video it, upload to photobucket,youtube or whatever you have, problem solved

edit: could it be that the starter doesnt disengage when it has pulled the flywheel to start the engine?

 

The problem is getting the squeak to squeak after the car is put on jacks.
It is so inconsistant and hard to make it squeak when you want it to.

 

Clutch slave hard line was barely contacting the transmission bellhousing... bent it slightly out of the way and the sound has never come back. Problem solved.