After ordering a new differential for crazy clunking and lots of whining, I pull into the service center today and low and behold, my radiator is leaking. When I knew the diff was going bad, I tried everything I could to get part number 15xxxxxxxx, the new beefier diff, but they would not give it to me, and could not even find the part, so im getting the old differential, which sucks. What pisses me off tho, is the fact that there is a new radiator part #, and they are more than willing to give me that part (supposedly not even in the catalogue yet) but they wont give me the new diff when I asked for it???? BS. but i am getting a new and improved radiator, so we will see how that goes.