there is another option.
you can get a hand brake setup from the local junkyard. Mount it to the left of your drivers seat so you have one on the left and one on the right. now route the cable back to the "Y" on the emergency brake cable. cut the cable and hook the left rear wheel to the left emergency brake handle and hook the right rear brake to the oem emergency brake cable.

Now when you get 'stuck' with one wheel spinning uselessly and the other doing nothing, pull up on the brake to the spinning wheel. You will be surprised how well your 'manual' limited slip setup will get some torque to the wheel with some traction.

I used this setup on an open diff'd Trooper when I opened the Golden Spike trail in moab lots of dropped jaws when I walked the stairstep etc.

Not a locker for sure BUT, once you learn how to drive with one hand on the wheel and the other diving to the appropriate brake lever when required, you can rock and roll pretty well total cost for me was about $15.00 US.

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