Rear end problem help

So guys I need help, I had purchased a new sure grip 8 3/4 rear end pumpkin from quick performance(i think) through eBay in September. Well just finally got to installing it. Well I went to take it out today and noticed some things in not happy about.

1st one is I am hearing a howling when I decelerate around 40mph

2nd one is I'm getting like a clunking when I turn?


What could this be? Did they not set up my pumpkin properly or does it have to wear in? I'm at a complete loss on this and not happy as I spent a pretty penny on it