I tried to search for this and if I missed it please direct me to it.
I have a 00 XJ that I am interested in swapping out axleshafts in
DidI read somewhere that you can swap the CV shafts from another model into the XJ? Is this something worth doing or would I be better just to upgrade what I have?

 

You have the best factory shafts already. CVs came in the Grand Cherokees from 93-98 and are OK but unless you like greasing them and checking boots all the time skip them. Your stock shafts are good up to about a 35" tire when driven smart.