Truck Dana 60’s are really thick tubes, mine was 3/8. The bar is 1.250 thick and once the pucks are in the housing, torqued to spec, the ends are slid on with the pucks inside them (where the bearing sits) and locking collars are then tightened down, the tubes aren’t going anywhere.
The ends of the tubes are chamfered cause your gonna need 2 welds to completely weld the ends to the tube. Anyway, I tack the ends in 4 spots 90 degrees apart, then do the other side. I heat the cast iron center with a torch while turning it (its on jack stands) I tack in 4 spots then move to the other side. The reason you heat the center is cast iron has a different heat/cool cycle than the steel tubes. Also helps burn out any oil/grease that is in between the tube and cast center.
Now while I’ve been doing all this, I turn the bar to make sure there is no binding. Now I run the first bead around the ends, checking the bar after each weld.
Now I heat the center again, fully welding it in on pass. My buddy is turning the Dana as I weld....that would real hard to do by yourself, lol! Do the other side. Check the bar for binding!
Final pass on the ends, check the bar and then enjoy a beer for job well done. Also listen for and “tinking” noise, and once you can put your hand on it, your safe.