Odd Dodge Ram 1500 problem, help?

Ok. Here we go. I have a 04 dodge ram 1500. I have a problem where something resonates right before i come to a complete stop. It also happens sometimes as i back out of my driveway. The actual truck's front end doesn't shake, but a noise that hums and vibrates resonates through the front of the truck and to the middle (about under the seats) I don't know if it comes from the front to mid, or starts from the mid and goes to the front. i've had my brakes, balljoints, and outer tie rod ends replaced recently, so i doubt its those. I've been told a/c clutch and tranny. As i've also said, it is louder when the a/c is on, so i don't know what effect that would have on the transmission. It also seems to happen more when the truck is cold, then the noise gets a little quieter. PLEASE, IF ANYONE KNOWS WHAT IT COULD BE, I'M TIRED OF IT.
 
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