66 Dart GT HT Whatsitgonnabe?

I shot a video of the inside of the rear axle. I hope linking to it vill work. I sure hope it's ok to leave that yellow marking goo in there.

https://www.dropbox.com/s/ymm1fdkdvqr4f8f/Video 2015-08-30 10 33 09.mov?dl=0

Can anyone make any sense of the "pattern"?

At roughly 0:52 in the video, I show the play (backlash) in the gear. Is that much play ok?

The yoke has some surface rust and I hear this version is a little brittle. Should I invest in something more sturdy?

Brushed off one of the brake calipers. I think it came out pretty nice. They seem to have been black originally. I'm thinking maybe I should paint them Mopar blue now that I've got a can of paint. But maybe that engine paint isn't heat resistant enough.