I was wondering how ou can tell if you have locker's from the factory or not in the rear? can you decode vin or anything else on the truck to do this? I bought a new truck and Im wondering about this before it's to late am I"m stuck somewere. thank's

 

Look at numbers inside glove box lid.
If you have G80 you have a locking Differential

 

thank's alot first newer chevy I had and I am learning a lot about it. it's got it now all I need is one up front when I get my lift and tires