If you want an LSD, save just a few more bucks and get yourself a Detroit Truetrac, Traklok might just cost you $175 but it uses clutch packs and will eventually fail since they get worn. It is true you will spend $500 on the TT but it is a stronger, more durable option and the worm gears won't get worn with time or need special lubricants to work...
Just my $.02