First of all, there are these things called spelling, punctuation, and capitalization. Look them up. The way one writes speaks volumes.
Second, you are looking for a Mile Marker
QuadraTrac part-time conversion kit. This will let you use manual locking hubs on the front and give you 2 and 4 wheel drive. Put one piece shafts in the rear
AMC20 and call it good.
If you really want to upgrade, there is no bolt in option. You can use a front and rear axle from a full size Jeep, i.e. a Wagoneer or Cherokee, pre 1980, with a
QuadraTrac Transfer Case , same as yours. You can get a front and rear
Dana 44 , or a front
Dana 44 and rear
AMC20 . The FSJ
AMC20 is much better than the CJ version. But these are NOT bolt in. The rear will have to have new spring perches welded on and the front has a spring spacing on 32", vs. 28" for the CJ, so the spring mounts would have to be mounted outside the frame. This is the same for any full size truck axle. FSJ axles also have a 6 on 5.5" bolt pattern as opposed to the
CJ5 on 5.5".
On another note, a Chevy 350 WILL NOT bolt up the the
GM Turbo 400 in your CJ. The Jeep
GM Turbo 400 uses an AMC bolt pattern.