Screech at high rpm
 

Hi
I have a problem
When i am accelerating in first or second gear and the let of the gas without upshift a screeching noise happen
it happen when the car leans forward

It would really help if you give more information.

Auto or manual?
Does the same thing happen when using brakes, gear in neutral?
If you go downhill and just use engine braking is the effect same?

What kind of noise is it exactly? Coming from the engine?

I'd guess it might be due to engine mounts and then having some weird position of engine causing the sound?

check Brake splash shields are not rubbing on disks or close. Look for warped shield.

Serpentine belt slipping?