Rather difficult, thats the reason no one around here has done it (or almost no one that ive heard of). Nothing will line up, all brackets would need to be replaced/moved, bolt pattern for wheels is different so you would need spacers, new axle shafts, or new rims with the JK bolt pattern, and the whole axle is wider than a TJ axle. And if I remember correctly, the lockers work with some type of electric impulse setup that is not easy to make work on a TJ, compared to the TJ Rubi lockers which are locked by a simple air pump. IMO dont waste your time, just buy axles set up for a TJ.
'93 YJ (Under Construction)
'05 TJ Rubicon (Electric Lime Green)
Gone but not forgotten:
'05 TJ Rubicon (Impact Orange)