What rear axle do I have?

[EGaskamp]

I've looked in the glove box, and found the sticker with the code on it, however there are about 30 3 digit codes on there and they are not labeled as to what they are! How do I know which one is for what axle I have? It's a '93 K1500 Blazer, and I'm mainly wondering if my truck has a limited slip rear diff. If not, how hard would it be to add LS to these diffs? Thanks!

 

[EGaskamp]

Ok, after taking a look at the codes I was able to determine mine is G80. This is the factory locking diff, and not posi, correct? What gear ratio is this?

Eric

 

[lesterl]

What are the other Gxx codes? GUx?

 

[EGaskamp]

GU6 is the code that precedes it. That would indicate that mine has a 3.42 ratio right?

 

[amtronic1]

Go here - http://www.rpocodes.com/GM-RPO-codes/gmrpocodesGthroughM.html

 

[lesterl]

yup....

 

[EGaskamp]

Go here - http://www.rpocodes.com/GM-RPO-codes/gmrpocodesGthroughM.html

Thank you so much! That's awesome