Just like in the service manual, with a few taps from a plastic mallet, the drive shaft popped on to the greased output splines of the trans.
There followed a good hour of screwing around with the rubber boot on the front end of the swing arm, as I tried to verify that the snap ring was in there, popped it out by mistake, then tried to get it back in after having greased the boot's front and back edges as prescribed by the service manual.
Like mud wrestling.
Eventually....
You can see the Sharpie mark at 12:00 on the back end of the drive shaft, snugged inside the swing arm.
Next steps: shock, and final drive.