Wheelbase.

The shortbed Comanche is 113" and the longbed is 119" (approx)

Both style XJs are 102" (approx)

The MJs and similar year XJs are 'identical' up to a point approx under the seat/rear edge of the front doorjamb: 4-door XJ front doors and MJ doors are the same, as is the crossmember. The XJ continues it's uniframe in a straight line back but the MJ begins to flare outward... The XJ leaf springs bolt outboard of the framerail - The MJ leafs bolt underneath.

HTH
 
The MJ leaf springs are also a fair bit longer than the XJ's.
 
Xj = 101.4
 
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