The B44 diff well the outdrives are different to the ones on the BJ4we. If I remember rightly the B44 outdrives are quite a bit shorter. As for the gears and internals I think these are the same.
I am not quite sure about the shims, I did my B44 diffs as per the instruction manual and now that it's been run it's lovely and free. I seem to remember putting a lot more shims on the BJ4 diff to make the mesh tighter so that I stopped shredding gears.
Hope that helps.
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