I have a waggy front 44. It doesn't have flat tops, but it is set up for cross over. Let me know if your interested. I don't know anything about it except it needs ball joints and has 4.10's. Complete hub to hub. 6 lug.
It was under my Tacoma when I bought it.
That's a strange axle... I wonder where that passenger side knuckle came from? I've never seen that type of solid knuckle on an axle that didn't use unit bearings.