Front end noise - humming - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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  #1  
Old 04-16-2010, 07:12 PM
dentguyrick dentguyrick is offline
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Unhappy Front end noise - humming

Hi Everyone,

I've been coming to this site for a while to get some answers and have really appreciated the knowledge base here. I've searched and haven't been able to find an answer to the problem I'm having.

I have an '04 TB with 127,000 miles on it. I recently starting hearing a loud hum coming from the front end. It got louder the faster I went. My first thought was that it had to be a wheel bearing. Driving straight and turning right, the noise was there. It got quiet when I was on a curve to the left. So... I changed the right front wheel bearing. I pulled it out of the garage and drove it down the road. The noise was still there. I pulled it back in, removed the bearing and re-installed it thinking I might have not torqued everything properly. All back together and down the road again.... the noise is still there

I talked with a guy at the parts store about the bearing. He said it is EXTREMELY rare to get a bad one out of the box and suggested I check the front differential. Sure enough, it was low on fluid, so I drained and refilled it (not sure the last time it was done).

Once again, out of the garage and down the road. The hum is still there. I'm at wits end. Can anyone tell me what the problem might be?
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  #2  
Old 04-16-2010, 08:29 PM
WOOLUF1952 WOOLUF1952 is offline
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There have been other members, IIRC, that changed wheel bearings using the same criteria as you. It ended-up being the opposite bearing.
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  #3  
Old 04-16-2010, 08:44 PM
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markarock markarock is offline
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I too think you changed the wrong side.

Think of it this way. Where is the heavier load when you turn the wheel right? On the opposite side, i.e. the left. When you turn the wheel left, it lifts some of the pressure off the LF bearing.

Then think of this. When is a bearing likely to make noise? When it has a load on it, or when it doesn't?

So, IMHO, you changed the wrong bearing.

But don't despair. Look on the positive side. You discovered that your front diff was low, avoiding a potentially expensive repair, and you will now have two new bearings. Sometimes it doesn't get much better than that.

Just my as well.
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Old 04-17-2010, 01:40 AM
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You don't necessarily have to buy a new bearing, just switch out the old one from the other side with the one that needs to be replaced.
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  #5  
Old 04-17-2010, 07:37 AM
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markarock markarock is offline
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That's true. You "can" use the 127,000 mile bearing. And it may last a while. But given how much labor is involved in changing it, you might want to simply be done with the job for, hopefully, another 127,000 miles.

But yes, you "can" just put the "'good one" back on the other side.
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Old 04-17-2010, 12:26 PM
dentguyrick dentguyrick is offline
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I appreciate the help. The bearing is a 1 piece, sealed unit, so no re-using it on the other side. Not sure I'd want to with the miles on the truck any way. I guess it looks like I'll have to bite the bullet and replace the left side now.

Gotta look at the bright side I guess. New bearings on both sides and I saved some major damage to the front diffy.
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Old 04-17-2010, 12:56 PM
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The bearing is a sealed unit, but they use the same unit on both sides, so you CAN use the old one on the other side, no problem. It just isn't such a good idea is all.
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  #8  
Old 04-17-2010, 01:00 PM
dentguyrick dentguyrick is offline
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This does have me wondering though... was the right side bad to begin with? Or has it been the left all along? It's a pretty quick change out (less than an hour) and I have more time than money right now. If I threw the old on on the left temporarily I'd at least know. Or is that a bad idea?
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Old 04-17-2010, 10:16 PM
WOOLUF1952 WOOLUF1952 is offline
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The only draw-back that I can think of is: Will the new direction of rotation make a difference?

If that is no problem, then it is a matter of your time.
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Old 04-18-2010, 01:02 AM
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markarock markarock is offline
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IMHO, the direction of rotation won't make a bit of difference. I moved a hub bearing assembly from one side to another once and had no problem.
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