Transfer case rebuild

Recently i've been hearing a scream coming from what seems like my rear end so i tore it down and found no problems what so ever. so i took it to a shop and the mechanic pointed out to me that the output shaft on my T-case(NP242) is wobbling! i dont understand what could cause this but he said that it needed to be replaced or rebuilt replacing a NP242 is a pretty expensive prospect and i dont know whats involved or how much it will cost to rebuild my exsisting one. if anybody has info on this i could use the help.

Update:

I'm gonna rebuild my NP242 with the help of some friends and i'm trying to find a SYE to install at the same time. so far i can only find two kits (rubicon express and currie) and both are hack and taps and i want to know if there are other kits out there that dont involve "hack and tap" or if a kit for a NP231 could be modified to work.