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Do I Have A Locking Differential?

flyboyron

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flyboyron Enthusiast

flyboyron

Posted
Posted

When I read about my truck, I always find words like, "your vehicle may be equipped with", and I may not know if it has it or not.

 

For example, the "Automatic Locking Rear Differential," I didn't know if they all came with it, or if was an option that my truck may or may not have.

 

Well I found out for sure today. Check this out....

 

 

http://i281.photobucket.com/albums/kk213/f...do/IMG_4643.jpg

 

:):D

rfh1030 Enthusiast

rfh1030

Posted
Posted

There is a G80 code on the sticker in the glove box that tells you if you have it or not, but a burnout works too! :)

foghorn23 Senior Enthusiast

foghorn23

Posted
Posted
When I read about my truck, I always find words like, "your vehicle may be equipped with", and I may not know if it has it or not.

 

For example, the "Automatic Locking Rear Differential," I didn't know if they all came with it, or if was an option that my truck may or may not have.

 

Well I found out for sure today. Check this out....

 

 

http://i281.photobucket.com/albums/kk213/f...do/IMG_4643.jpg

 

:):D

 

That's the NOWP option (No One Wheel Peel) :D G80 it is!

jblakeney Senior Enthusiast

jblakeney

Posted
Posted
Open diff can lay two strips. Check the glovebox for RPO G80.

 

Yes your right.

 

 

I will second this. My 99 is a NON G80 truck and leaves 2 strips (whenever I go in the the differential, mine will be getting an Eaton G80 OE style Locker)..... Never equal lengths thou.

 

Jbo

00Silverado4x4 Senior Enthusiast

00Silverado4x4

Posted
Posted

I'm not the brightest bulb of the bunch, however from my understanding of open differentials how would you get two strips? I thought the idea of an open diff was that only one wheel is powered. I might of missed something on this conversation but something isn't sounding right.

pm26 Senior Enthusiast

pm26

Posted
Posted
I'm not the brightest bulb of the bunch, however from my understanding of open differentials how would you get two strips? I thought the idea of an open diff was that only one wheel is powered. I might of missed something on this conversation but something isn't sounding right.

 

If both wheels are on the same surface with the same friction coefficient, then the traction on each wheel is about the same. Thus both wheels will spin.

Silverado4x4 Senior Enthusiast

Silverado4x4

Posted
Posted
I'm not the brightest bulb of the bunch, however from my understanding of open differentials how would you get two strips? I thought the idea of an open diff was that only one wheel is powered. I might of missed something on this conversation but something isn't sounding right.

 

If both wheels are on the same surface with the same friction coefficient, then the traction on each wheel is about the same. Thus both wheels will spin.

 

 

Yes and when one wheel in a open diff has more traction that one wont spin just the wheel with the least traction.

jblakeney Senior Enthusiast

jblakeney

Posted
Posted

Idk, my 99 non-g80 always left a short spot on the left and a long mark on the right......... and my 01 G80 leaves usually two = length marks.

 

Jbo

  • 2 years later...
Fishin Bob New Member

Fishin Bob

Posted
Posted

This is more like a question than a reply. I have a 2008 Sivlerado, 1500LT 5.3, 59Kmi with the G80 rear end. It's supposed to "lock" as in, lock the axle so that both wheels turn at the same rate up to about 20mph. If it's truly a locker, this isn't something that you can control. The rear axle locks when you stop (supposed to) and unlocks at a higher speed. Limited slip and posi-traction are different. I can "sometimes" hear mine clunk into the locked position. (Not to get too far off subject, but my 2002 Rubicon has 4 wheel electrically operated lockers. All wheels turn at the same rate. Thus the term crawler). A friend of mine told me to switch to synthetic oil because the regular 90wt can be to heavy to allow the lockers to engage, thus the clunking sound. Also, in the past, I have had a problem pulling my boat out of the water because the lockers didn't engage. My question (s): Does anyone have any experience with using synthetic oil in the rear end? Does it alleviate the problem? Thanks.

MikeNH Senior Enthusiast

MikeNH

Posted
Posted

The G80 is just crappy in general. They don't lock up reliably. I have whatever came from the factory for oil. I don't think synthetic will make much difference.

 

That aside, maybe it was a typo but there wasn't a Rubicon in 2002 I don't think. Thought the first year was 2003 and the first year was an air locker.

intheburbs Enthusiast

intheburbs

Posted
Posted

GM specifies synthetic 75W-90 for the rear axle.

 

The G80 is always going to make a clunk because it only engages if the difference in axle speeds exceeds 100 RPM, IIRC. If you abuse it, you'll break it. I've driven my two Suburbans ~125,000 miles. Both have the G80. Both work exactly as advertised. I have no compaints.

 

From my '08 owners manual:

 

SAE 75W-90 Synthetic
Axle Lubricant
(GM Part No. U.S. 89021677,
in Canada 89021678) meeting
GM Specification 9986115.

 

Ditto on my '01:

 

SAE 75W-90 Synthetic Axle
Lubricant (GM Part No. 12378261)
or equivalent meeting GM
Specification 9986115.

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