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Originally Posted by Silverado Brethern
I am the second owner of the truck, it has a 14 bolt 9.5" rear, 5 leaf springs, and a class five hitch, all were from factory the previous owner did nothing to the truck. It was used to haul a truck bed camper so that could be why it has more heavy duty features. if it does have posi-trac then when ever i power brake both wheels should try to spin but it's always only one; however when i just floor it and cut the wheel both wheels always spin. Also i had a friend stand out side the truck while i was in 4-Lo and he could plainly see 3 tired spinning at once with the rear two constant and the fronts alternating.
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You have a G-80 locking differential and they do clunk when they lock. This diff works as an open diff until there is a 200rpm difference in the rear wheel rotation. At this point the rear diffrential has weights in it if I am not mistaken that lock the diff and it will clunk sometimes. The reason only one spins when power braking is that the design of this diff only alows it to be locked at low speeds. Once the vehicle is traveling or the wheels are spinning at a certain speed it will automatically disengauge. I don't know what the exact speed is, But if you search the net for info on Gm's G-80 locker you should find all the info that explains how it works.