I have the feeling I'm going to regret asking this, but does anyone have instructions on rebuilding an 8" rear differential to a limited-slip? How heinous of a job is it? I see the kits for sale on eBay, I have access to a machine shop at my job, and the prices on 8" diffs are ridiculous. I tried Googling it and couldn't find any instructions online. Which oughta tell me something, I guess. . ..