Just so you know, you can't simply just bolt in a set of air-shocks in the front of an XJ/MJ and call it good. It is going to call for a LOT of reinforcement/extra support to mount a set of air shocks up to hold an axle. Especially if your doing an axle swap where the axle is larger (and hevier).

Not sure why you want to go with air shocks, but the amount of time/fab/custom stuff to get them to work your better off (and probally cheaper) to weld coil buckets and keep running coils.

Just my opinion, as I've considered it myself and done a lot of research. Unfortantly our bodies on our Jeeps just do not support running airshocks without a lot of modding since they are unibodies.