It just started yesterday. I get a whirring sound similar to the power steering sound. It is not noticeable when idling, but when I am driving, the noise gets louder, and depending on the motor RPM, the noise increases in pitch. When the truck is shifting(automatic) you can hear the pitch of the whine every time it changes RPM on each gear. I think it's coming from underneath behind the transmission, but maybe the noise is travelling. I can only duck my head under the door frame while hitting the gas while parked. I have seen a post on youtube where it could be the idler?


Could this be the problem? Because the whine changes pitch changes so quickly, I am thinking it is in the transmission area. Does the belt change speeds so quick when shifting gears?

All my fluids are topped off and of normal color(not black or burnt)

 

I've had to replace the alternater and my idlers because of high pitched whining, but I have also heard IWE gears whining very similar in sound to your video. Jack it up while the engine is running and verify that both of your front hubs are completly unlocked.

 

Turns out it was the idler bearing as in the video shown. Mine actually broke right off.

 

Just in case anyone else was wondering about engine/belt speed fluctuations during shifting, yes, of course the engine speed changes as the transmission shifts. This is pretty basic stuff, folks. How can you own a vehicle and not even know something as fundamental as that?

 

I'm fairly stunned when it comes to auto mechanics. I did know that the engine would change speeds, but I wasn't sure how quickly it would change RPM from one gear to another