I recently bought new wheels and tires. I need the right speedometer gear, can anyone tell me where I can go to find the right one or which one i need? I have a 96 GT and I recently bought 18 inch wheels with 245/40s on the front and and 275/40s in the back. I dont know if it matters but I am running a 9 inch wheel in the front with a 10 inch in the back. I also have 3.73 gears. If anyone could help me I would REALLY appreciate it.