I also put one in my 89 4door ( an auto) and it worked absolutely flawless, in deep snow. Front and rear LSD outperformed a buddy's Toyota equipped with dual lockers up a snowy slope. Basically, let go of the wheel, and it steers back and forth as LSD finds traction.... With an auto, one can load up front and rear at the same time using a light application of foot brake...

BUT. On the road, in 4wd, in slush, ice, etc, it was scary. I no longer used 4wd on the road after my truck changed lanes without my permission on an icy road. And I also stripped the splines off the end of a cv axle (I had used new c clips, but maybe they weren't seated properly... Who knows?).

Would I do it again? Depends on how I used the truck, and the climate conditions. Up here in the land of winter snows, it basically limits you to RWD on the road, so probably not... But the offroad traction was amazing! YMMV.