I called these guys http://www.tbkperformance.com/ and they sell BILLET gears 3rd and 4th for $550 each. They have them in there race car and they say there indistructable. So it looks like i'll be going with 3rd for now, and if 4th breaks later i will replace it to. Guess i'll have the LSD welded up when its out too. I think this will work fine for what i have in mind. I dont really want anymore than 325 to the wheels. Anymore than that and it'll be a pain in the ass to drive.