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1999 Sierra NBS RCSB
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13 Posts
Discussion Starter #1
I'm asking because I've read that all Z71's have locking differentials.

However, while I do have RPO code Z71, I do not have RPO code G80.

Verified my codes from the RPO sticker in the glove box, and by my VIN on compnine.
 

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8,320 Posts
2000 gmc z71 here with no g80, i like it better this way. Has saved me from buying a new rearend being undergeared and running 37s
 

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1999 Sierra NBS RCSB
Joined
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13 Posts
Discussion Starter #3
Thanks!

I found more info. Seems like G80 may have been required in later years (2004 - on) as a prerequisite for Z71. So that's probably where the "if you have a Z71 you have a locking diff" myth came from.
 
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