You didn't say how wide you wanted the axle to be when finished...
Same width as wide track CJ? Wider?
Are you going 6 bolt outers?
If you are here is the basic deal:
You need to cut the long side 4" to get the spring perch spacing the same. It seems like the axle you have is approx. the same as the Chevy axle we used.
Once you allow for the 4" cut of the long side, you need to figure out what width you want your axle to be. Then you allow for an even amount of cut on each side.
In our case, we had cut 2 1/2" off the short side & 6 1/2" total off the long side (4" + the 2 1/2" to match the short side)
This gave us an overall WM to WM of 58 3/4" - this is 3 3/4" wider than "wide track" CJ Dana 30.
If you wanted it to be Exactly the width of the Dana 30, then you would divide the 3 3/4" difference by 2 and add that to the amount cut on each side. Therefore, it would be 4 3/8" off the short side & 8 3/8" off the long side. (if this is making sense).
But whatever you do *Don't take my word for this* measure yourself about 5 times before cutting!
Another thing to keep in mind just as a side note is that the outers for a D44 are longer than for a D30, and you have to take that into account when calculating your WM to WM. You shouldn't just measure your ball joint to ball joint on the axles. I do not have any data on what the D30 ball joint to WM length is, but the 6 bolt D44 is listed on my chart, 5 bolt D44 or 8 bolt D44 may vary.
Hope this helps, and again, be sure to measure for yourself. The rest is just math.
"The only makeup I wear is never-seez"