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Might be a bearing in one of the accessories, such as the alternator or power steering pump. Try to isolate to a specific location, especially as it gets worse.
Noises are tricky. It could be a lot of things. If your are sure that the noise is in the rear end, consider U-joint harmonization as a possibility. They could be worn. You could be hearing bearing wear and there is no "band-aid for that, you just have to get in there, determine which bearing it is and fix it. You might be hearing noise from the gears themselves. Again, once a gear wear pattern is set, it's there until you replace the gears. Listen to hear if you are only hearing the whine under acceleration or under deceleration (no brake) that will help determine if you are hearing a gear wear pattern that is on the drive or the coast side of the gears. Sorry there's no quick fix additive that I know of but hopefully this helps guide you to the root cause.
wheel bearings or diff bearings try coasting wiht the engine shut off down a hill to listen better,or get someone who knows cars to come with you to hear the noise
You probally have a bad front wheel bearing , when the noise changes when you move the wheel is typical of a bad bearing.this should be covered under your powertrain warr.
shoks may be good but your springs may be faded, as for the birdies cherping you may have a worn tensioner bearing for one these, a/c belt, alternator, water pump bearing, check spark plugs & wires conditions for knocking
also check for loose or failed engine mounts
Remove the drums and check your rear brakes. If okay, you may try testing a couple different tires in the rear. Belts separating and flat spots show worse at higher speeds.
It could be bearings if truck is used alot while loaded. Remember 1/4 ton is only 500lbs. High miles, hard driving, or if it was wrecked in rear could all cause these smptoms.
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