cardan joint rebuild or replace?

The cardan joint in the front driveshaft bound up and tore apart my transfer case. Can I just buy some new U joints and the piece in between them (the parts that are fairly shredded at this point) or do I have to buy a new driveshaft. I heard someone say that is a lifetime non servicable unit.

http://stu-offroad.com/axle/driveshaft/driveshaft-1.htm

http://stu-offroad.com/axle/driveshaft/driveshaft-5.htm

HTH

goto www.stu-offroad.com he has an excellent write up on replacing all that....