A medium sounding whining noise whenever I give it gas but quits when I let off. on 2001 Dodge Ram 1500

At any speed whenever I press the pedal to give it gas I hear a whining noise that sounds almost like the big tires you have on a 4WD truck that makes that noise when going down the road but my tires are not the real big ones but they are on 20" wheels but the noise starts when I give it gas and quits when I let off. Was told by a non mechanic who I bought the truck from that he thought it was a bad axle but he really didn't seem knowledgeable.

by in Bragg City, MO on August 15, 2013
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1 answer 4 comments
ANSWER by , August 15, 2013
4x4? Auto/Man.trans? How many miles?
COMMENT by , August 15, 2013
Yes 4X4. Automatic transmission. 124,000 miles.
COMMENT by , August 16, 2013
Check all running gear lube to start with. Most likely rear pinion bearing, have a mechanic check this and gear lash. He will know what to do. Needs to be listened to!
COMMENT by , August 16, 2013
Thanks for the info. I will do that. Thanks again.
COMMENT by , August 16, 2013
U welcom.