Rear end problem help

So the guy ended up giving me a call, i think it was quick performance afterall as the guys last name wasd quick but anyways. So i told him my whole deal and he said that be builds them with tight clearances and it also has a crush sleeve eliminator in it already, he also told me the noise im hearing when i turn is the clutches in the unit that havent gotten enoigh oil/additive. He told me to that i havent driven it enough to break it in and for me to go to a open lot and do alot of figure 8s. Im pretty sure one of u guys mentioned that above. Then i asked him about the howling and he said that i need to drive it around and if it doesnt go away then to call him but i do give him credit as he went out of his way to call me and discuss so i feel like he does stand behind his work. So i am going to do what he stated to do and see if anything changes since he is backing his work and willing to get to the bottom of this. I will try that out on wenesday and see what happens. Has anyone had anything similiar like this told to them?