Hello, I just purchased a 2005 Suburban. How can I tell if it has the "locking differential". And if so, is the Chevy "locking differential" a true locker, or is it really a limited slip? And if it is limited slip is it mechanical? Also, It was advertised as an LT model. I'm now very suspucisous? It only has the 16 in tires and no leather. It has lots of other options like the bucket seats in the, towing package, multi zone AC/Heat, with rear control panel. Also has the rear audio control, but as I said, many things standard on the LT are not there, like: leather power pedals 17 in wheels garage door openers etc Any help would be greatly appreciated.