8-3/4 Noise After Rebuild..What's Normal??

When you guys state "friction modifier", are you talking about the whale oil additive?.............and should I add it now, or drive the thing for a break-in, then drain and add or change the oil..........and what about the royal purple for the oil after some miles............I've heard this oil is the best from a lot of pro's..........BUT, need input from you guys...........:book:

I would stictly use Mopar limited slip additive. I bought it at the dealership. All you need is 4oz of it for each oil change. I added the additive before break in and after so either way I was safe. I've can't help you out on the royal purple since I wasn't allowed to use it with the Auburn gear carrier so didn't use it but I know it is great stuff.