replace the rear shock asorbers
Rear shocks/struts are bad.
Yes if it is the same length & after refitting the end of the jeep drive shaft to bolt up to the ford rear end
It is in the center of the rear of the axle.
No. The axles & suspension are completely different.
I'd look at the pinion bearing first. It's near the end of the rear end.
I believe that is the Dana 35
Dana 35 or Dana 44
Yes, there are locking rear ends available from many after market sources.
You can go with 87 thru 1995 for a direct fit.
All Jeep XJ's have front and rear metal bumpers. Generally equiped with plastic end guards.