IIRC that red Dart was in Canada as I googled the intersection of the extended video. Looks like rear diff locked up on both as the slick is scuffing when coming to a stop.
<<It's Stony Plain, Alberta>>
My guess is that the right leaf spring perch broke/pulled of the axle. Them leverage help yank the other one off.
I say that because i don't see any thing on the axle tube as it came out.
