Wheelbase.

Do the MJ, 3-door and 5-door XJ all have the same WB ?
If not. Whats the numbers ?

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

Thanks guys !

they're only "identical" from the firewall forward.

the MJ has a MUCH stronger chassis than the XJ.

Here's a site that gives specs - hope it's helpful! http://www.southeasternxj.com/specs/index.htm