Hopefully both are 4.0L auto? Then it's easy (XJ front bolts in, but the rear doesn't) I use a come-along to pull the front axle back to put the bolts in. 15 mm heads will drive you crazy. The track bar bottom bolt tends to strip out. If you have access to 3 /12" taller or at least 4x4 front coils, it helps to do it now. You can do the front axle one weekend, then the trans/tcase the next. Check the gear ratio because most 4.0L autos are 3.55 ratio, but may be different and you need a match for 4x4.
"Usually found in a Jeep near Reiter, WA"
FOR SALE STUFF
'81 Eagle wagon with upgrades $2500
'87 Comanche shortbox 4.0/AW4/NP242 on 33" tires $3500