2004 GMC Sierra Rear end noise

Tiny
ROLAND0305
  • MEMBER
  • 2004 GMC SIERRA
  • 108,000 MILES
Last week I bought a 2004 GMC Sierra 1500 from a private seller, seemed like a legit guy. Well he said that he had just had the whole rear end rebuilt, come to find out it was just the bearings and right axle. After driving it a few days whenever it would get warmed up there would be a terrible popping/ clunking coming from the rear differential. I spoke to the mechanic who rebuilt it and he said I would need to replace the clutch packs. Then when I was calling a few parts stores I had a guy tell me I might want to try changing the oil and adding the friction modifier since it was a limited slip and the mechanic probably didn't add it. This fixed the problem, but the past couple days I have noticed after driving it there will be a slight grinding coming from the back end when I turn the pick up off. Is this a big problem or something I don't need to worry about?
Thursday, October 3rd, 2013 AT 12:33 PM

13 Replies

Tiny
SATURNTECH9
  • MECHANIC
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So you hear agrinding with the truck not moving and your in park and your turning the engine. Off?
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Thursday, October 3rd, 2013 AT 12:52 PM
Tiny
ROLAND0305
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Yes, like a grinding/ humming. Like something is rotating with bad bearings
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Thursday, October 3rd, 2013 AT 12:56 PM
Tiny
SATURNTECH9
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If you don't. Start it and just turn. The key to the run. Position can you hear it?
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Thursday, October 3rd, 2013 AT 1:03 PM
Tiny
ROLAND0305
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No, no I can't
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Thursday, October 3rd, 2013 AT 1:05 PM
Tiny
SATURNTECH9
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If the truck isn't moving where is the noise coming from rear pumpkin?Also you can't hear it while moving?
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Thursday, October 3rd, 2013 AT 1:13 PM
Tiny
ROLAND0305
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  • 7 POSTS
As far as I can tell the rear pumpkin. And no, at least not over the exhaust
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Thursday, October 3rd, 2013 AT 1:15 PM
Tiny
SATURNTECH9
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How about when coming to. Stop?Sometimes those clutches stick don't. Always fully release when. Coming to.A stop
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Thursday, October 3rd, 2013 AT 1:37 PM
Tiny
ROLAND0305
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  • 7 POSTS
I will have to check and see. But if this is the case would anything need to be done?
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Thursday, October 3rd, 2013 AT 1:39 PM
Tiny
SATURNTECH9
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Also while making turn's see if you can. Hear it what kind. Of friction. Modifier did you use?
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Thursday, October 3rd, 2013 AT 1:51 PM
Tiny
ROLAND0305
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It sounds fine. I don't recall what kind it was, I got it at carquest
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Thursday, October 3rd, 2013 AT 2:35 PM
Tiny
SATURNTECH9
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I personally use the Ford motorcraft friction modifier it works reallywell.
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Thursday, October 3rd, 2013 AT 3:05 PM
Tiny
ROLAND0305
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Well what I got fixed my original problem. I guess I will just see what happens now, as long as it doesnt tear anything else up I can live with the noise
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Friday, October 4th, 2013 AT 8:21 AM
Tiny
SATURNTECH9
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It's really strange how it. Happens. When. The truck isn't. Moving and your. Turning the key off?
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Friday, October 4th, 2013 AT 11:53 AM

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