Rear end problem help

Rmoore said
Howling on deceleration can be a loose pinion bearing ! In that case you will need to have the pre load on the pinion bearings readjusted ! Friction Modifer will fix the clunking noise ! You just need to drive it ! Go to a school parking lot and do some figure 8 with it! The clunking is the friction clutch’s grabbing and letting lose again! Once the modifer gets on the clutches good that will stop !

So if I just give the pinion but a little more preload the howling night go away? Okay I just was starting to thinking I'm going to have to take it all apart or send it back. Thank you for the info. My buddy said they're is also a chance the howling will go away once things are worn in?