I own a 2010 ford f150 that make a grumbling sound when i turn. the dealeship has replased the clutches for the limited slip rear end 2 times now and it is happening again. they told me that the ford engineers are working on the problem but they do not have a fix for it yet. So they told me to just drive it with the positive traction engaged until they get a fix for it. not exactly the answer I was looking for. Anyone else having this problem