Today was REALLY productive.
Photo 1 shows the rear driveshaft (carrier bearing to axle) as compared to the splines of the driveshaft it has to connect to, I had second thoughts about this combo working just by looking at it but decided to mate the splines up and give it a try.
Photo 2 shows the splined halves mated together with the rear universal joint sitting in the yoke as tightly as I could get it by pressing it by hand, I still had to mount the retainers and tighten them down but so far it looks like things are working out for me.
Photo 3 shows the rear driveshaft all bolted up and the slip yoke cap tightened hand tight like it should be. This driveshaft connection accomplishment at 10:00pm means that the only two things needing done under the Suburban to make it driveable are connecting the clutch pedal to bellcrank, and bellcrank to clutch fork, then connect the reverse light wiring, and tie up those pesky yanked lock-up circuit wires I inadvertantly yanked apart by not checking twice that the stupid little bracket bolted to the side of the transmission case was removed like it should have been, hey at least I unplugged the connector.