What Rear Axle Do I Have?

[Mossyoakglock]

I need to change the rear diff fluid on an 06 Envoy. Looking at the parts on Autozone's website, it says there are two different rear ends. 8" or 8.625" ring gear. I looked on the axle itself but couldn't find anything. What are the rpo codes for the rear axles? Any other way that I can identify the rear end for the gasket?

[drdave1958]

Since no one is jumping in here, I found this site.

 

RPO Codes

 

HTH,

Dave

[Z45]

5.3L engine 4.2 pts

4.2L engine 3.6 pts

 

So it would appear the 5.3L V8 model has the bigger axle