GMT 900 Trucks General Discussion 2007 - 2013 Trucks | General Discussion

Something Broken in Differential

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Old Dec 19, 2013 | 06:45 AM
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Default Something Broken in Differential

Hi Guys,

I think I've broken the limited slip but wanted to check and see if anyone else has run across this or had other thoughts first.

When driving the suburban it was chugging a bit. I thought maybe fouled plug or even the transmission. Checked the supercharger, plugs and all no luck. Driving this morning turning into Chik-Fil-A I roll down the window and hear my left rear tire dragging as I turn......I straighten out and drive a few feet and then a loud pop from the back. So I'm thinking the locker is staying engaged all the time. Anyone else had this? I am either going to get an entire rear end from a junkyard and swap or buy parts and fix. Has anyone upgraded theirs before? Recommended parts? Thanks
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Old Dec 19, 2013 | 07:38 AM
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G80 or is the rear end upgraded
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Old Dec 19, 2013 | 10:04 AM
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Drop the cover and check for parts failure. Believe it or I have had a oil change straighten out symptoms like yours provided it's not grenaded.

BUT, being as you are blown and probably play a lot we all do then expect to find carnage and plan on a posi unit at a minimum and probably a gear set as well if it flat detonated.

For what a salvage yard rear end will cost you can usually upgrade to aftermarket posi and a gm gearset for less than or equal to inferior OE parts in the form of a replacement rear end.
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Old Dec 19, 2013 | 07:05 PM
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It is the stock G80. I'm going to order parts and upgrade. Trying to decide between 3.73 or 4.11.
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Old Dec 19, 2013 | 09:41 PM
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4:11 all the way cant beat gears. If your a 4x4 or AWD gotta regear the front also.
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Old Dec 19, 2013 | 10:13 PM
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Don't drive it, you may trash your ring and pinion. When I broke my spiders gears in my Yukon dura grip, it made a loud clank, then started dragging a releasing a tire.
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Old Dec 20, 2013 | 01:06 AM
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Sounds like you broke some teeth off your spider gears or cracked the G80 case. Just happened to mine not too long ago and did the exact same things your saying. My diff stayed locked and that chugging feeling is pieces of metal getting in between the gears. Best bet is to park it take the cover off and inspect it. More then likely it's all in pieces.
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Old Dec 20, 2013 | 01:51 AM
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Grenade80. 4.30 gears at your weight imo unless its your family vaca truck
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Old Dec 20, 2013 | 01:53 AM
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Search local yards for a z71 if you want out fast and cheap. 4.10 gear w grenade 80.

Also could check your pinion nut. Had one back off and the pinion had it locked 100% of the time
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Old Dec 20, 2013 | 09:40 AM
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Originally Posted by 01WS6/tamu
... cant beat gears.
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