I have a 83 camaro z28.with a 406 sb and a turbo 350 trans and the factory rear end the car was org.a 4 speed car.but when i drive the car down the road it redlines at 65mph.like it needs another gear to shift in to.i dont know if it because i have a 3 speed trans with a 4 speed rear end or if its the toque converter.Well NEED HELP sick driving 50 mph.