You're SOL. As far as I am aware there is no locker for the IFS. According to all the digging I've done, the IFS is too weak to handle a locker even Limited slip.
But, maybe I'm wrong and so is everyone I've spoken to. Let me know if you run into anything different.
I don't know of anybody that makes a locker for it but If you want some serious traction open it up and weld the spiders together,where it is a disconnect axle you won't even know it is locked until you pull the stick,bad thing is that you won't be able to turn.
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