I'd suggest the Powertrax No-slip. It's the same as the Lockright Locker except, it's a bit more street friendly but cost about $100 more.
For the lockright locker, powertrax, or EZ Locker; if you do the install yourself, be sure to get new outer axle seals and o-rings. Cheap and easy change while you have the shafts out. If you have a shop do it, expect to pay about $300-$400 for labor.
Or you can pay me for 1/4 of that cost

:devil: