have a gearing problem, my 57 has a 327 engine . A 350 Turbo trans. Has 3:36 gears . The problem I’m having is when driving down highway at 55 MPH the engine is running at a high RPM. I can see the gas go down ( not really but it’s screaming) seems like it needs another lower gear to go to ! We checked the ring and pinion and the ring had 37 teeth and the pinion had 11 which comes out to a 3:36 rear end. What is my problem BRUCE DANVILLE
THE CAR WAS ORIGINALLY A 3 speed shift standard ! Please help me