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Rear diff ???

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Old 05-11-2010, 09:13 PM
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Default Rear diff ???

On my 09 Silverado, it doesn't indicate that it has a g80 but it pulls both rear wheels while spinning. Is there another rpo for a limited slip or am i goin crazy?
Old 05-11-2010, 09:28 PM
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Look inside your glove box for the codes....

Actually, on my breakdown of RPO codes, G80 reads "Axle Positraction Limited Slip"

When I ran my VIN on GM VIS it came up as G80 / Locking Differential- Rear Axle.

My guess is that GM's version is just another name for limited slip, not a true locker.
Old 05-11-2010, 09:35 PM
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No, they're lockers...just not very good ones. There's a small pin that locks the gears together, which is what shears when the G80 blows. lol

This fall I will probably be swapping mine over to a true trac.
Old 05-11-2010, 09:38 PM
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Get the True Trac....
Old 05-11-2010, 10:36 PM
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My glove box does not include g80, but it does indeed pull both rear wheels....do they use another rpo now???
Old 05-11-2010, 11:16 PM
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The rear is noted with a Gxx RPO code. What Gxx codes do you have listed?
Old 05-12-2010, 11:07 AM
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G80 is the locking diff RPO.
GT4 is 3.73 gears
GT5 is 4.11
Old 05-12-2010, 12:58 PM
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G80 is GM's code for a limited slip rear axle.

Weather thats a locking diff or a clutch style or anything else they used to Limit the amount of slip between the wheels....hence Limited slip.

F-bodies got the G80 code and came with a clutch style LSD for example.
Old 05-12-2010, 03:27 PM
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Not that it is used in our trucks, but one that is used in other GM applications for limited slip's is G86.

A handy site for looking up any RPO Code is: http://www.rpocodes.com/
Old 05-12-2010, 05:15 PM
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Originally Posted by 1Bear
Not that it is used in our trucks, but one that is used in other GM applications for limited slip's is G86.

A handy site for looking up any RPO Code is: http://www.rpocodes.com/
Not 100% on this one...but I believe it was an option only in FF 14-bolt rears. Again, I am not 100% sure on this.


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