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Join Date: Mar 2005
Location: Northern CA
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Opened Chev. Tahoe differential and found this
My 2006 Chev. Tahoe 2WD (125k miles) was making a bit of a swishing noise that seemed to be coming from the rear. I took it in to an independent shop specializing in rear end repairs for service and they found this and one axle end bearing that didn't look great but was serviceable.
What causes some rollers to be messed up and others to look not warn? It is amazing it didn't make more noise and breakup. Bearings are tough. The diff. is a Gov Lock (Code G80). The guy said they break and I should replace with a limited slip at some point. I think the best replacement is a "gear" type diff. e.g. torsen truetrac. They replaced all the bearings in the center area and installed new seals at the ends of both drive shafts. $560 later I was out the door. 
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Sold: 1989 3.2 coupe, 112k miles |
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03-25-2017, 07:23 AM
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Join Date: Feb 2008
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Any water in the diff?
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dolor et pavor Copyright |
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03-25-2017, 07:50 AM
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The guy didn't mention finding any water.
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Sold: 1989 3.2 coupe, 112k miles |
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03-25-2017, 08:25 AM
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Still Doin Time
Join Date: Nov 2004
Location: Nokesville, Va.
Posts: 8,225
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What you are seeing is 'brinneling' of the wearing surfaces. The hardened part of the rollers as well as the race has worn past and into the base metal. The result could be wrong type of oil, contaminates in the oil, or the oil has overheated to the point where it looses its lubricity properties and breaks down.
And / or overloading / over stressing those components. Lastly, improper installation where there was too much pre-loading on the bearings by not correctly shimming causing overheating under load. It can also be a combination of these factors
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'15 Dodge - 'Dango R/T Hauls groceries and Kinda Hauls *ss '07 Jeep SRT-8 - Hauls groceries and Hauls *ss Sold '85 Guards Red Targa - Almost finished after 17 years '95 Road King w/117ci - No time to ride, see above '77 Sportster Pro-Street Drag Bike w/93ci - Sold Last edited by asphaltgambler; 03-25-2017 at 08:46 AM.. |
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03-25-2017, 08:44 AM
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Join Date: Dec 2014
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Those rears have been around just about forever, and are usually pretty reliable. The gov-lock is also not a bad locking diferential, but will not take repeated abuse, especially with large off-road tires. If you are not in the habit of repeated burnouts, or heavy off-roading, it will probably last forever.
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03-25-2017, 10:28 AM
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Join Date: Oct 2003
Location: Northside, Brooklyn
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Ugh, "brinneling" that's what we all dread when we open up a hub or some bearing-thing. Never knew it had a name, never heard that word!
Tahoe is probably good for another 100,000 now.
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jt '83 SC '96 M3 6 Bicycles 2 Sailboats Last edited by Kraftwerk; 03-26-2017 at 05:12 PM.. |
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03-25-2017, 10:44 AM
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Could have run dry for just a short time. Once that type of wear starts, it just doesn't stop.
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03-25-2017, 01:54 PM
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Location: Northern CA
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Thanks for the comments.
What is a bit perplexing is rollers on the other side of the same bearing looked to have very little wear. Possibly a chunk of stuff went through that bearing and then fell down in the sump. I don't know. I'm glad to hear the gov-lock will last - of course the rear end place was saying they go out about at 125k miles with disastrous results. I was reading about the gov-lock and it seems it will not lock above a certain speed (20-25mph), that's comforting to know. I don't rely on the locking feature - I think it came on one time since I've owned it. I was crawling over some rocks up in the Sierras after ignoring a don't-go-here-without-4WD sign. I finally got turned around and back out of there.
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Sold: 1989 3.2 coupe, 112k miles |
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03-25-2017, 03:45 PM
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Join Date: Jul 2001
Location: los angeles, CA.
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My experience w owning GM trucks w the G80 locking diff is that it works great in snow/ice/gravel. If good AT type tires are installed, it's amazing what the truck will go through before 4wd has to be engaged.
Never had any maintenance issues w mine but also did not own for a long time. 
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03-25-2017, 04:24 PM
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Location: Northside, Brooklyn
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My buddy has a Tahoe ... maybe '01? or '99?, I forget, but I think there is 235,000 mi. on it..
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jt '83 SC '96 M3 6 Bicycles 2 Sailboats |
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03-26-2017, 05:14 PM
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Still Doin Time
Join Date: Nov 2004
Location: Nokesville, Va.
Posts: 8,225
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Quote:
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'15 Dodge - 'Dango R/T Hauls groceries and Kinda Hauls *ss '07 Jeep SRT-8 - Hauls groceries and Hauls *ss Sold '85 Guards Red Targa - Almost finished after 17 years '95 Road King w/117ci - No time to ride, see above '77 Sportster Pro-Street Drag Bike w/93ci - Sold |
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03-27-2017, 06:41 AM
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That is not brinelling. Most likely water contamination. Brinelling does not wear away the original surface.
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03-27-2017, 08:05 AM
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Join Date: Jan 2011
Location: Gulf Coast FL
Posts: 1,485
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Flaking on rollers, search engine of choice is your friend. My opinion is poor manufacturing as opposed to wear or loading unless you you load it like a mule, damage looks like the poorly made offshore 996 IMSBs that pop.
next time try this https://sfbay.craigslist.org/eby/pts/6022841425.html |
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03-27-2017, 09:08 AM
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