Getting a howl between about 35-50 mph on moderate accelaration. More prevelent in decel. Hard accel...no noise. Mostly light throttle to decel coast in that speed range. Thinking pinion bearing allowing play in pinion-ring gear mesh? Fluid is good and full...has synthetic 75w-140w.

Thanks ...Jeff

 

If the noise changes with differences in throttle, then you need new pinion bearings.

 

That's exactly what it does. Kinda' figured pinion bearings too. Thanks for the confirmation!

Jeff..