I was wondering what you all would recomend for a locker or limited slip. My 85 is a daily driver and is running 32" tires, I don't plan on going over 33s. I have the stock GMC 10bolt 28 spline. My four-wheeling mainly just consists of mud. I am also limited to about $300 - 400. Recomendations? 85 k5 blazer with an old 305....must have more power!