Slightly different issue fitting a locker to an IFS 90 series though than a live axle Jeep. Locking the front transfers the 'weak point' somewhere else - the drive shafts. Mr T never really envisaged adding a front locker. Used in moderation, it's a neat thing, but the reality was that I found was that adding the front locker wasn't like adding a 'super turbo get out of any situation' option. Especially for what they cost! I was a bit surprised. Most of the situations where you need that extra grip are when one of the front wheels has grip and both the rears haven't. Expecting the one front wheel to pull you out is pretty optimistic. When you get that stuck, it's time to get the winch out. Given the choice between a winch and a front locker (on a 90) I would go with the winch, spend the rest on a rear winch and then try to get some extra lift on the front and fit 33" tyres. On it's own, the front locker is very expensive and doesn't gain you that much. Nice to have and play with as a toy though. Your dime, so your choice obviously, but the advantage is minimal most of the time.
Chris
Chris