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It should have been thoroughly checked. Noises like these on four wheel drives could several different things. A bearing, CV axle, or the differential, or bearings in the differential. A wheel bearing will make different sounds when making a turn. A CV axle is a constant sound. Differential bearings can come and go, depending on if it is a bearing for the axle or a pinion bearing. Axle side bearings usually make a constant noise. The differential can also come and go. Depends on acceleration or slowing down. All these sounds are also with a vibration. Slight to harsh.
Driveline and wheel bearing noises can be very decieving. - especially on 4X4 vehicles. These noises can travel through the vehicle and sound like they are coming from one place when they are caused by something else. I have 2 recomendations:
1. Take it to a professional that deals with 4X4 drive trains and have him lend you an ear.
2. get the thing on a lift and listen to the components with a stethescope. It could be a wheel bearing, a differential, a transfer case, or even the transmission making a noise like you have described.
Here are the common causes or rear end noises
Constant high pitched whine at all speeds: Pinion Bearings or Ring gear carrier bearings
Whine at steady speeds or whines on deceleration: Rear end gear set is worn and will need to be replaced.
Rumbling type of noises are caused by wheel bearings or a tire with a separated cord.
is the noise is constant when you are driving is a bearing , is the noise is when you brake, check the brakes..jack the car and spin the tire you will here the noise ..hope this was very helpful..
from your symptoms of noise from rear ? i would say your suspision is correct it is probably one of hub bearings in the early stage of wear/burning out front wheels chocked raise each rear wheel in turn and with park brake off check for undue movement /rock in wheel/s and any noise when you spin ? if oone shows to be suspect ? advise you replace both sides ? this is not too expensive a repair and can be diy if you have tools and confidence? bearings come as a kit for each wheel/hub if you have time you will save $$$$$ in garage cost? hope this helps/inspires you best wishes from uk
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