I have a 1997 chevrolet 1500 4x4. When I am driving down the road i have started hearing a constant roar in the rear end. It gets a little louder when i drive in the 40 mph range.
You might check the dope in the rear axle
SOURCE: Alero loud humming/roaring sound coming from front end.
That's indicative of a wheel bearing, which is why you were told to change that out. However, it's also possible that the carrier bearings in the differential (where the drive axles attach) have gone bad. That happened to me on my 300ZX several years ago, and I had to replace the diff bearings. I would have them checked out somewhere other than a dealer (you'll probably get a better price from an independent shop).
As a sidenote, to be sure it wasn't a wheel bearing, if you hear it quiet down in a turn one way but get louder in a turn the opposite way, it's likely the wheel bearing. If you turn left at speed and it gets louder, then it's the right bearing (since you're loading up that side of the car). If it gets quieter in a right turn, it's the right side (you're unloading that side of the car and not putting as much weight on it, so it doesn't drag as badly). See if you get that symptom just to be sure that the wrong side front wheel bearing wasn't changed.
SOURCE: 2001 LINCOLN CONTINENTAL ROAR WHEN ACCELERATING
Same problem with an LS...wheel bearings. Comes in the whole hub assembly. Just had it fixed for $340.
SOURCE: loud roaring noise
jack up front of car get hold of tyre an see if u get any play if u do u may get away with nipping them up a bit
SOURCE: 2002 ford Ranger 3.0 v6 (auto) rear end noise when accelerating on curves.
Grab the bed of the truck and vigorously rock the vehicle from side to side. If you hear clunking in the axle, you probably need to check the carrier bearings in the differential. I had the carrier bearings, wheel bearings, and seals replaced in my mother-in-law's 1991 Ranger for $280, and it rides like a new truck. Well, ok, it rides like an 18 year old truck with a new rear end. I provided the wheel bearings and seals to the shop, and they provided the carrier bearing, lube, and labor. While the axles are out, check the surface where the axles ride on the bearings. If they are worn, there are undersized bearing available, but it is usually cheaper and easier to just by new axles.
SOURCE: 2001 Chevrolet Cavalier front End Roar
You must replace wheel bearings in pairs to avoid loading the old bearing and, in time ruining your new bearing hub it is possible that you have already damaged the new hub
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