FWIW, a few years ago I had a Yukon Zip locker installed in the rear of my 03 f250 after having problems leaving the hammers in the rain (i had to unload my trailer to drive out, hike back and drive the jeep out).
It worked just fine in that environment, but it made my truck horrible every day. In the rain, I would spin a rear tire anytime I took my foot off of the gas (19.5's..) and every time I crossed a crosswalk I'd break loose (which really sucked on say a curving onramp).
I live on a steep hill and have to make two tight turns while climbing to get home. Without the factory LSD, I would chirp the inside tires on both of those turns *EVERY DAY*.
Eventually I pulled the air locker back out and put the factory LSD back in. It wasn't worth the hassle for the 18 minutes every year or so that the locker was truly useful to me.