ok. My truck has a GM 12 bolt rear w/ 3.73. Right now I have it completely dismantled the rear to replace outside racer and pinion bearing. While I have it all apart I want to replace the open differential with a limited slip. It wont be a daily driver with ocasional off roading. So limited slip is all I really need. I'm runing stock tires now with maybe 33x12.5 when these wear out. Basically I'm asking my cheapest options. Any model chevy's I can look for in yards with limited slip diffs to fit 12 bolt GM? Any after market under $400(had no idea they cost so much)? Ive looked at previous posts and havent found much to help me out.