You posted a solution on my problem with my 1997 GMC Jimmy. You said if the hub bearing is tweaked a little bit it will make a sound. If the shock absorber is bad will that tweak the hub bearing? Does that explain why it only makes the sound in 2 wheel drive versus 4 wheel drive?
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Re: 1997 GMC Jimmy Rumbling Problem
Yes if your shock is bad it will MAY have tweaked the bearing just a bit. It doesnt take much at all. When the pressure is off the bearing (ie 2wd) your shock should keep that bearing from moving "Floating" around a whole lot in the hub, when you add the 4wd now you have the drive axle and the shock keeping the bearing from "floating" moving around. 4wd is a more stable for your suspension which helps to keep things in align (hence the more power and stability). You may have a good bearing here, but may have a bad hub. Since you have replaced the hub and the CV Shaft. I would suspect you are having a bearing issue. The bigger question is how and why? Feel free to ask me anything more about this. I am willing to help you in any way I can to help you get this resolved. Is there anything else that you think maybe contributing to this? Anything parts you replaced other than the hub/CV Joint?
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If the problem is at the wheel, two possible causes are a bad wheel bearing or worn brake pads. Both of these noises will only be experienced with the vehicle on the ground and moving. Also, if this is a FWD truck and it only occurs when accelerating, it can also be caused by a failing drive axle or bad transfer case bearing.
You could very well have a wheel bearing inside the hub assembly that is going bad. Usually they will make a rumbling/growling type of noise that increases with speed and may be worse when taking sweeping curves at highway speeds. Sometimes there will be play in the bearings which can be detected by raising the the wheel a few inches above the floor and attempting to rock the top of the tire in and out. If it moves a bit then usually the bearing is to blame BUT the bearings can also be bad and not have any free play in them so it's not a perfect test. Often times I have to get the vehicle up on a hoist so I can spin the tire by hand while listening for the noise to be able to pinpoint the source as often it can be difficult to find the exact cause. If you can't find the cause I would have a shop check this out as it could very well be a safety hazard if you have a wheel bearing fail while driving at highway speeds. Good luck, hope this helps a bit!
If it's a 4x4 they can't be greased. The bearing is pressed into the hub.
If it's 4x2 you'll have to remove the caliper. Take off the dust cover on the rotor. Remove the cotter pin, spindle nut, and washer, to pull the rotor off and grease the inner bearing.
If it's 4x4...Loosen the lugs. Remove the axle shaft nut and washer. Jack it up. Pull the wheel. Remove the caliper/bracket. Trace the ABS sensor wire into the inner fender and unplug it. Remove the nuts/clips that hold the wire from moving around. Look on the back of the hub (spindle) for the three bolts that hold the hub and bearing in place. Remove them and pull out the hub and bearing.