I believe you can change the stubs without cracking the case. I would need to varify this. But back 12 yrs ago when I didnt know much about cars I remember trying to do a cv shaft on a subaru. I didnt realize that there was pins on the axles. I beat both shafts out of the trans without removing the pins the stubs came out with the axles. then I transferred the stubs to the new axles. and put them back in. I remember it ended up working in the end. I would try it again but I havent had a need to change out any stubs. lol
I suppose this would be assuming there wasnt a carrier change involved in the stub swap also?