Just installed the differential with the 4.77 Final Drive. All I can say is that this isn't my car!! Where is it?!

Speedo is off of course and the video sucks since I was alone and don't have a mount.

http://www.youtube.com/watch?v=VGTGohQeAPY

 

Get the pinion crack tested before reinstalling. Most engine reconditioning shops have a Magnaflux crack tester. If the pinion was not in correct alignment due to the bearing failure it can put unusual loads on the teeth and they start to crack at the root. You may as well get the crownwheel checked at the same time.