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Go to a place that has a good smooth parking lot and a wooden private fence. Open all your windows and drive the car slowly as close as possible along the fence in order to pin point where the sound is coming from. The sound will echo back from the fence and will make it easier to pin point the area where the womp womp sound is coming from. Next thing you can do is lift the car up and place it on four jack stands in case you have a front wheel drive. If you have a front wheel drive and your car is on four jack stands, place you gear in nuetral and spin each rear tire separately to see which one is making the noise. Keep in mind that it might be a wheel bearing or if it a rear wheel drive and on four jack stands have someone drive it slowly while you listen for the noise. Some rear wheel drive differentials can make this noise if it is low on differial oil. Be very careful that the jack stands are on solid and making good contact with the car frame and flat on the pavement. Don't place yourself where the car can fall and hit you or run in to you. Good luck.
Suspect wheel bearing. They can be quite tricky to isolate as noise carries through coach. Try driving next to a large building with window down. Should be a growling noise that increases/ decreases with speed.
so hard to diagnose over the phone, however, you could try a couple of things, check to see if any of the tires are rubbing against anything. if not, can you try and distinguish where the sound in coming from? in the engine compartment, it might be something like a shredded belt, or it could be your u-joint...try those first, best of luck
Have you looked at the Universal joint(s)? If it is 4-wd I'd inspect the front driveshafts as well - Other than that, I'd also inspect the brakes to ensure that the shoes were being held down properly and that the Universal joint is not worn - It sounds alot like either the U-joint or a brake problem - Have you inspected the rear end? Do you use the truck to pull anything? If you'll look at the U-joint and Brakes - If not, there are carrier bearings inside the rear end that may be the culprit as well, but I'd leave them for last as inspection is a bit involved -
Coming from the rear? I could see the noise coming from the front if your axels are bad. It seems weird cause the vehicle would make noises like that in normal driving because they dont change when you switch to 4 wd
if the noise isassociated with "wheel speed" then it is in the rolling parts... axle hub bearing brake rotor caliper wheel or tires...if it goes away on right turns then you are unloading or separating the issue then...so a hub /wheel bearing /axle issue is most likely...does your brake pedal pulse when you feel it..(riding the brake while driving)..does the steering wheel shimmy ?