Awesome. I've been trying to track down some issues with the 77. Namely a squealing from the rear end, as well as a wobble when getting on and off the gas. Inspection of the differential showed the side yokes moving in and out too much. Upon removing the differential, I was faced with rusted "sombreros," which hold the cross member in place.
With the differential out, I could inspect the internals. As suspected, the too soft side yokes are wearing out and new ones need to be installed. Notice the mushrooming at the ends.
Further inspection will lead me to what else needs to be done.