A front LSD is available for the X... Calmini and several folks market it. It is a clutch type, though, but easy on CV joints and hubs... you burn up the clutches before you blow a joint.

ARB also offers a front locker through Automotive Customizers. They take a standard RD27 and do some magic to it.

Thanks for the points on LSDs versus lockers up front. The point about off camber driving problems with lockers is very clearly spelled out in the ARB warnings.

Another point with front lockers is the strain on drive components... the stock automatic hubs will go first, or a CV joint if the X has a lift (extreme angle). A front locker generally means manual hubs with release fuses to deal with the new stress. A blown hub fuse is only $15 and 20 minutes of down time.

This is a great board for kicking ideas around.

See ya,
Doc
(Xtilla, the UnJeep)
http://members.cox.net/xtilla