2005 Dodge Ram 1500 3.7l V6 rwd with approx. ~160,000 miles
My truck has starting making a "whining" noise whenever I am accelerating. The pitch and volume change the faster I go and I first notice it around 20 mph. It kind of sounds like a supercharger. The noise reverberates through the cab so I've had trouble telling whether the sound originates from the front end or rear.
I checked the serpentine belt first but that looked good. I put some WD-40 on the belt but that made no difference. Then I took the belt off and turned all of the pulleys by hand but they all checked out. After that I decided to look in the rear end and noticed my differential fluid had gotten very low. Oddly I couldn't find any source of the leak. I cleaned the differential and put new fluid in it but that had no effect on the whining sound.
I'm stumped. So far the noise has not affected performance whatsoever, it is just annoying. Does anyone have any ideas? Any 3.7 experts on CF?