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

You need to add some friction modifyer. I just installed a new 4.10's and a rebuilt Sure-grip in my 8 3/4, it chattered bad, especially around sharp turns. I added the sure grip additive, it has stopped! I have heard that 4,000 miles break in but I have hammered on mine since I put it in!! :burnout: