You can use a jeep Cherokee for parts to make the YJ go again, they pretty much swap. Using a cherokee is *way* cheaper and easier to find.
Obviously the body and frames are totally different. You do have to change the spring mounts on the axles tho cuz they're different. There is no such thing as an axle that will bolt into the YJ unless it comes from another YJ. The transfer cases are the same except for the number of splines on the input shaft - it depends on what size engine and which transmission they had. You could just swap internal parts or swap the entire unit. Clutch should be the same. Wheels and tires should be the same.
Most all of the mechanicals will swap from the cherokee to the YJ.
***--- Wrecking Crew member ---***
"I've prolly been around longer than you think"
91 YJ 2.5L 5-spd, 31" BFG ATs, mostly stock NO RUST 172K in WNY, Daily Driver