[Zoomad75]

From the knuckles out the 44 and the 10 bolt use the same parts. Ball joints and outer axle stub shafts are the same. Lockout hubs are the same. I believe the seals are too.

The earlier 44 did have a couple of differences that changed before the 10 bolt came along. One of which is the flat top passenger side knuckle. 10 bolts never got them and the 44 lost the flat top in '77 or '78. That change also coincides with a change to the tie rod. The flat-top knuckle (and the matching one on the driver side) have the tie rod ends going in from the top. The later 44 and 10 bolt knuckles have the tie rod ends attach from the bottom. They swap easy, but you have to get both sides to match.

The earlier version (flat top style) used a smaller inner bearing too. Which means the spindle is different. The 10 bolt and later 44 swap right in to use the larger bearing.

If you are just swapping the later knuckles to get disc brakes as long as you grab the complete knuckle assembly per side you'll be just fine. If you get a complete axle assembly it should bolt right in.

I'd look for a 77-80 44 to get the larger bearing. The difference is probably negligible for sure, but I like to maximize the effort.