Noise in rear end when turning at low speed

Re: Noise in rear end when turning at low speed

Postby doyoulikeithere » January 21st 2011, 5:54am

Ok, I'm no expert, but Heres what I have been thinking, And I had a g80 Grenade that made noise and then eventually locked like you, and then eventually after I got stuck in a snowy nightmare, It wouldnt lock at all anymore.
It still drives fine, but has no LS at all, I've pulled it outta the van for spare parts now.

Anyways, in my reading, I heard that the weakest link in these G80 is a small pin. I saw pix of the pin, but dont have the link anymore.
If I recal, it might have the pivoting thing on it, or it might have been some other pin, it was a long time ago. Anyways, they work out of their hole, and eventually wear or break and the thing fails.
During the wearing out period, you'll hear noises from the diff and it wont corner slowly well at all, I guess cuz the pivoting locking thingamabobber isnt doing as it should.
I remember the picture from that thread showing a pin with a knurled end that had wiggled out of its hole just a bit.
Heyfound a quik pic for ya, I think its #11.

Maybe your problem? maybe not, but my :2:
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Re: Noise in rear end when turning at low speed

Postby 2 H.B. [OP] » January 21st 2011, 6:51am

There's a thing that's visible in LeeAnn's photo, that looks like the #11 in the diagram. I remember when I had the cover off I could move it to the right and it had a spring that pushed it back to the left. It's like a 1" cylinder with a cutaway so you can see the spring etc inside it. Kind of in the middle of the photo, just a little higher than center. Is that it?
It sounds like yours just lost the LS and kept working otherwise? That would work for me! Mine will probably blow up instead. Was yours AWD?
The snow here has helped me out, It makes the problem go away, pretty much.
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Re: Noise in rear end when turning at low speed

Postby doyoulikeithere » January 21st 2011, 9:37pm

That G80 of mine was not witn an awd.
The one in my awd never ever gave me any grief.

Ya the thing on the pin, pivots and makes the diff lock.
Seems that pin can bend, come loose or break.
Loose or bent will make it sticky and not work well.
Broken, well, thats just broken,end of story.

Speaking of broken, dont spin your tire is you get a bit stuck in the sno, it could mean the end of your G80, just like mine.
:twisted:
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Re: Noise in rear end when turning at low speed

Postby Leeann_93 » January 21st 2011, 11:05pm

Sorry - I knew I was supposed to get something from the manuals, but I couldn't remember what or for what thread :oops:

G80 exploded.jpg
1 piece case



G80_2piececase.jpg
2 piece case
'05 Astro AWD vin X
'02 Astro LS AWD vin X
'00 Astro LS AWD - WIP
'99 Safari XLE AWD - broke
'93 AWD EXT vin W - real broke
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Re: Noise in rear end when turning at low speed

Postby 2 H.B. [OP] » January 23rd 2011, 4:50pm

Thanks for the diagrams! I'm still trying to figure out how the governor works. Maybe a rebuilt unit would make sense.
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Re: Noise in rear end when turning at low speed

Postby 2 H.B. [OP] » February 19th 2011, 12:38am

Here's am update, if anyone's interested.
I talked to a guy in a local tranny shop, and he said get the stuff from the dealer and do it repeatedly if necessary.


Anyway, what I did after about 1000 miles of no improvement with the GM fluid, was tip the van a little to the left and put a little extra fluid in, since I had about 8 ounces or so left over. I just couldn't bring myself to spend another $80 on fluid, and I figured the extra might help as long as I stayed off the highway. Amazingly enough, it seems to have made a difference, even though the problem isn't gone, it's definitely getting better, now I'm looking for sharp low speed turns instead of avoiding them.

Fortunately, I don't have any highway driving I need to do right now, I'll let it drain on a flat spot to get the level right before I go on any trips.

Thanks for all the help!
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Re: Noise in rear end when turning at low speed

Postby pb3 » March 12th 2011, 1:55am

hey, curious how you're holding up? have a '04 AWD that had it's encoder motor replaced after driving it for some time without (service AWD lamp). now we're getting a slip-grip from the rear going into parking spots.
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