hey as far as the limited slip goes....your right it sucks in mud. no comparison to a locker. as far as performance in the mud there are tons of factors beyond the vehicle type. mainly look at axles/tires. a 77 K30 with 44" drag slicks wont get any further in the mud than a geo prism would. For mud you need lockers front and back and MUD tires (boggers). this is regaurdless of the vehicle you are in. you could put a locker and good mud tires on a 2wd work truck and blow away 90 percent of stock vehicle in a rut. but you also have to take into account the weight of your vehicle, type of mud you are in, and most of all your driving style will affect how well you do in the mud. Good luck and keep em dirty
A stroke bolder, a pinch better.