SOA in the rear will net the width of the axle tube plus the height the new perches standing off the axle plus the width of the springs. Mine was a perfect 5.5" on a D44 rear using 2.5" perches from Ruff Stuff Specialties.
The rear drive shaft will have to be custom. It will be around 41" for a 5.5" lifted 4WD with a D44 or Chrysler 8.25. That should give an idea of what will work with your existing parts.
2004 Jeep Wrangler Unlimited
1997 Jeep Comanche - 4.7L Stroker, Lifted, "Restored", and soon to be supercharged.