That sounds like a wheel bearing starting to go bad. Usually you'll get a rumbling sound that will increase in volume and sometimes pitch as the speed increases. A quick way to check for wheel bearing wear is to first determine if you hear it at the front or the rear. Once you know that (or at least have an idea which end it's at), see if the noise gets louder or quieter when you turn. If you make a right turn and the noise gets louder, the problem is on the left side of the vehicle, because you're loading the suspension on that side. If you then turn left at speed and the noise goes away or quiets down, you reinforce the fact that it's on the left side because you're unloading the suspension on that side.
When you've determined as best you can which side and which end of the vehicle the noise is on, you'll know which wheel to check. Jack up that corner of the vehicle, and grab the tire at the top and bottom. See if you can get it to move at all by shaking it. A good wheel bearing will allow no play whatsoever. If the bearing is going bad, you may see that you can "shake" the wheel while it's mounted on the hub.
If you have a hard time determining which wheel it is, jack up each corner and shake each wheel in turn and see if any of them shake while mounted on the truck. If you find one that does, you're most likely looking at replacing a wheel bearing.
Try this out and post up what you find, and we can take it from there.
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how to replace weel bearings on a 2003 dodge ram1500 4.7 pickup
i have this problem on my 04 neon with the growling and it does get worse when you turn to the right so this helps me greatly
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