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Old January 8th, 2013, 01:22 PM   #1
ckupq
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05 Sierra LS problem

So over Christmas I started having this little problem with my rear diff.

When I took off with one tire on dry pavement and one on snow, the one on snow would slip and then the diff would lock up with a BOOM. I would then take off because the rear end locked up.

If the tire that tire on dry pavement hit a patch of snow, it would repeat the process with another BOOM. Meaning it will unload and reload back up as I move forward or reverse.

Sometimes for no random reason the rear end will "lock" and I'll be driving around with a spool with no better explanation.

I bought this truck used in May. At this point I have no reason to believe its anything other than a stock GM limited slip. I'm at a loss as this is the first LS I've had with this sort of problem.

Discuss.
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Old January 8th, 2013, 01:34 PM   #2
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My new truck will do this as well sometimes. Just the G80 locking up? I had to use 4x4 for a small amount of time and when I went back to 2wd the rear end would stay locked up
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Old January 8th, 2013, 01:47 PM   #3
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Yea Its got a G80 and after watching a couple of videos I see what is happening with mine. While I don't think there is anything too wrong with it, I'm still gonna have it looked at to make sure everything is OK back there.

Is there anything I should have looked at to see if its bent or broken?
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Old January 8th, 2013, 01:54 PM   #4
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change the fluid and put the gm additive in it.
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Old January 8th, 2013, 02:27 PM   #5
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common problem, do as hosejockey said.
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Old January 8th, 2013, 02:29 PM   #6
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Rear Axle

This is right from the gm service manual


SAE 75W-90 Synthetic Axle Lubricant (GM Part No. U.S. 12378261, in Canada 10953455) meeting GM Specification 9986115.
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Old January 8th, 2013, 02:42 PM   #7
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PIP3001B: Light Duty Truck Rear Axle Lubrication Service Interval - keywords lube - (May 21, 2009)







Subject:

Light Duty Truck Rear Axle Lubrication Service Interval







Models:

2000-2010 Cadillac Escalade, Escalade ESV, Escalade EXT







2002-2010 Chevrolet Avalanche







2002-2009 Chevrolet Trailblazer







2000-2010 Chevrolet Express, Suburban, Tahoe







2000-2007 Chevrolet Silverado Classic







2007-2010 Chevrolet Silverado







2000-2004 Chevrolet S-10







2003-2006 Chevrolet SSR







2000-2005 Chevrolet Astro, Blazer







2004-2010 Chevrolet Colorado







2004-2010 GMC Canyon







2000-2009 GMC Envoy







2000-2010 GMC Savanna, Sierra Denali







2000-2007 GMC Sierra Classic







2007-2010 GMC Sierra







2000-2010 GMC Yukon, Yukon XL, Yukon XL Denali







2000-2004 GMC Sonoma







2000-2005 GMC Jimmy, Safari







2003-2009 Hummer H2, Hummer SUT







2006-2009 Hummer H3







2000-2004 Oldsmobile Bravada



Condition/Concern:


The service information and owners manual do not show a service interval for the 7.6, 8.6, 9.5, 9.75, 10.5, and 11.5 inch rear axles with or without G80 (locking differential).

Recommendation/Instructions:


These axles do not need to be serviced under normal operation due to the synthetic fluid that is used from the manufacturer. Please refer to the owner's manual for any questions regarding axle fluid change information.
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Old January 8th, 2013, 07:58 PM   #8
Kodiak450r
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That would be a fairly normal characteristic of any working G80 differential. Mind you they are a LOW speed traction device. They are not strong enough for holeshots or burnouts, or full throttle on loose surfaces. It may last for a little while with abuse but when they fail it's catastrophic.
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