Dodge 9 1/4" diffs from 1974 to 1979 have a 5 on 4.5". If you use one from a 1/2ton or Ramcharger the perchers even line up(within a 1/4" each side) to an XJ. I *think* the axles are about 1.5" wider in the trucks but these axles were used in cars as well and may be narrower. Lockers CAN be had but selection is not as good as a D44. These diffs stand up to fullsize trucks with V8s and 35" tires.
cLAY
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'89 XJ 4" lift, Warn Combo mount and 9.5ti!
31s, 4.10s and rear lockright!
That's enough(for now!)