Locker too much money or the wait to long?
To turn the front axle or any " single track" axle into a torque breaking axle ( like the clutch type ) this will work for moderate 4 wheeling not rock crawling. Here is the description of what to do:
Start in a clean work area
keep it clean
dirt is bad
the extra work on cleanlyness pays off
Remove the spider gears
Purchase a set of thrust washers ( from Ford or whoever )
Modify either the old or new set of washers ( you will be using both sets upon reassy)
- on 1 set you will need to remove the placement lip on the washer these will now be "shims"
- on the other set do not modify
reassy. install the spider gears with the unmodified washer against the gear and then the "shim" between the washer and the case.
you may have to thin the shims to fit ( sand the case side only! )
what you do to one side you have to do to the other
DO NOT USE EXTREME FORCE on the gears
do not hammer on them unless

you have a brass punch!!
refill with a quailty Synthecic oil ( Amsoil 75W-140 )
YES there are pro's and con's to doing this
pro's- cheep, works, cheep, works well when you need a bit more traction, you shouldn't need to reset the ring and pinion, and it's cheep too
Con's- if you don't know what your doing you can mess it up, it adds more side load to the carrier, with the money you save you now add a skid plate, or take your girl to dinner and a mud bog.
Good luck,