The bearings will have to be pressed off and on. If there are shims make sure you keep track of which side they are on.
Also I am not 100% positive since I have not messed with these aam axles but you may need a spreader, just be sure to spread with in specs or you will rish warping your axle housing.
If you do end up needing new gears get a book and you can look up the part # and it will give you the shim offsets to get you pretty damn close. Actually it has always put me with in specs, it will save you a lot of time and hassle. Look into running a good synthetic gear lube like Amsoil severe gear.
I know this is starting to sound scarey but it really isn't if you have a book and follow the specs sheets. I think the hardest thing is pressing the bearings on and off. Its really difficult to press off the bearings w/o messing up the shims. If you do mess them up don't just trash them at first keep track of where they came from and check the gauge of each one. Then you can just get a shim kit and replace them with what was there. Last time I bought bearings I think I spent between $50-$75 with a shim kit. I always get a shim kit because I usually mess them up getting the old bearings off.