[beaglegun]

I just noticed a rapid squeaking noise when I accelerate. I can hear it with the windows down when I'm next to a building. Let off the pedal and there is no noise. Step on the pedal and the noise comes back. Anybody got any ideas? I've never noticed it before.

 

[RT]

Can you replicate the noise by revving the motor in park? If so, pull your belt and repeat. If the noise goes away - start looking at each rotating assembly individually. If all your tensioner and idler pulleys have no play, and everything rotates freely, replace your belt.

 

[action4478]

Look at the drive shaft U joints as well, look for rust stains . With the truck in neutral & some one you trust with their foot on the brake , wiggle all the joints .

 

[action4478]

IIRC , I had a broken Flywheel on an auto once that did that too...

 

[beaglegun]

Thinking maybe the carrier bearing or a u-joint squeaking when under acceleration pressure?