I'm going to get 4.30 gears and the Ultimate ring and pinion installation kit from Parkway Performance. The price comes out to $285 including shipping. My car has 86,xxx on it and that's why i'm going with the better installation kit. My 97 gt is automatic and I'm trying to find out what speedo gear i need. Do i need 23 tooth one or what? I have the money to do this but I don't have enough to get a programmer or chip. so i need some help. thanks