I had to clearance my passenger side diff yoke significantly, I had to cut the axle shaft, and I had to get creative on welding the cap to get full travel. The most deceptive part was you can drop your beams and a welded cap will hold. But if you dropped your beams before you put axles shafts in, then you know your clearance. After you put the shafts in, your clearance is limited dramatically. This is all relative to Cut and Turned beams giving the 4" lift.
Attached is a pic of the rough 1/2" I had to cut off from the axle shaft and comparing it to the factory. After this I now have a spring in the yoke, and yes the yoke axle cap is welded in. I had to grind the yokes a lot to get the clearances since it would bind before hitting full drop. Even then the axle shaft was the limitation so I had to chop the 1/2" off it.
Also attached is what it looks at full droop where you can see the axle shaft blew out well past the yoke pushing the spring out and busting the cap. Regardless, it's the shaft that's took long which is very evident.
After all said and done, no cap busted and I've hit full droop unstrapped several times even in 4x4