Limited slip rear...

'04 avalanche 1/2 ton. I was just curious if these come with a limited slip differential and if not any idea how much it would cost to get this put in?

I know you can get a locking rear...comes with z71 package.

Check the sticker in the glove box with all the codes on it. If you see somewhere on that sticker "G80", it at the very least came from factory with one installed in the rear end.