And looking at what I took off, I didn't see sealer on the threads, although there might have been some on the face of the nut. After cleaning all the parts with brake cleaner to ensure there wasn't ATF on the surfaces that would prevent the sealer from adhering, I put Loctite 567 Thread Sealant on the first inch of the splines of both the output shaft and the yoke, and slid the yoke home. Then I put the "anti-spill oil seal" in place, and put 567 on the threads of the nut and the output shaft as well as on the faces of the washer and nut. There was plenty of thread sealer.
After torquing the nut on the yoke I installed the driveshaft and then the skid plate, and topped up the t-case. And we are ready for 4-wheeling!
Looks good!