Transmission/Differential Noise?

[ChasVS]

My 04 Ranger XLT 3.0 4x2 Auto Transmission w/121K. It makes a howling/whining noise that is audible around 35-45 MPH. It rises in tone with speed and only makes the noise when under power. No noise when coasting. Just giving a little gas makes the noise and when letting up on the accelerator it stops.
(I hesitate to use the term "howling" because people rush to say its wheel bearings), but it's not that as the sound clearly comes from under the truck in the transmission area.
Could it be the Differential? Sound seems closer to the cab than at the back of the truck.

 

[Transman304]

Take a look at your diff where the yoke is on the pinion shaft and see if your seal is leaking or wet with fluid. Sounds by what you describe it is pinion bearings or shaft. Let us know.

 

[ChasVS]

Local reputable shop checked it out and gave it a clean bill of health! It's a bit noisy, maybe just got in my head, but they didn't find anything wrong with the Diff, Tranny or Driveshaft!

 

[AzLizard]

Local reputable shop checked it out and gave it a clean bill of health! It's a bit noisy, maybe just got in my head, but they didn't find anything wrong with the Diff, Tranny or Driveshaft!

Your strreo is not loud enough.

 

[ChasVS]

Your strreo is not loud enough.

That is a TRUE statement!

 

[Transman304]

Thanks for the update. Glad it is in working order.