for what it's worth if you're looking for deeper gears on the cheap, a jeep XJ cherokee after '87 uses either a dana 35 or an 8 1/4 in the rear. the easiest to find are 3.55 geared 8 1/4's that typically came in autos. manuals had 3.07's, I think the tow package had 3.73's...they are 60.5" wide, basically the same as an FMJ, and I can find them all day on facebook marketplace locally for $150 or less. just need to cut off the shock mounts and spring perches, and weld new spring perches in the correct location. IIRC the spacing is about right, but they're on the wrong side of the axle (spring over vs. under)

also, the rear disc brakes from a liberty or late 90's grand cherokee with an 8 1/4 are a bolt on if you want rear disk.