Jeff,
I am jealous, this is one cool looking suburban!!
The great news is that (quote:) " my wife and I took the '65 sub out for a ride today". This means you have her FULL support and maybe she will even be out in the garage helping you rebuild the differential. Or maybe she will let you rebuild it in the bathroom tub!!
You may want to disconnect the speedo cable soon, before the speedo needle gets broken.
It does sound like you have some fun ahead of you.
Brian