2002 Chevy Avalanche Loud Hum/Roar when slowing down vehicle

SOURCE: 1997 Dodge Stratus, unknown roar

Try replacing the front end wheel baring(s) If it is a roar that you can hear resonating from the windows, this is most likely it.

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: ROAR IN A 2000 VOLVO XC70 WAGON

if its a roaring sound it your outer wheel bearing

SOURCE: axle roar

Could be any one of the bearings in the rear axle. Suggest taking it to a reputable transmission shop to get it diagnosed further.

SOURCE: wheel noise or roar in front end with increased road speed

THIS NOISE IS USUALLY THE HUB. HAVE SOMEONE GO WITH YOU ON A TEST DRIVE. GET THE ROARING TO HAPPEN AT ITS LOUDEST AND GENTLY SWERVE THE CAR LEFT AND RIGHT. DON'T BE SURPRISED IF YOU THINK BOTH HUBS ARE BAD. LIFT THE FRONT OF THE CAR AND PUT IT ON JACK STANDS. PULL OUTWARD ON THE BOTTOM OF THE TIRE WHILE PUSHING INWARD ON THE TOP OF THE WHEEL. IF THE WHEEL MOVES EXCESSIVELY YOU FOUND THE HUB THAT IS NOISY. USING A MECHANICS STETHOSCOPE YOU CAN SOMETIMES HEAR A ROARING TYPE NOISE ON THE BACKING PLATE SIDE OF THE HUB WITH THE ENGINE RUNNING AND THE TRANS IN GEAR. TRY NOT TO GET THE SPEED UP TOO FAR ESPECIALLY IF YOU CAN HEAR THE NOISE AT LOW SPEED, YOU DON'T WANT TO VIBRATE OFF THE STANDS.