New to the site but have a question? My car has a ford 302 stroked to a 327, built ford aod, 28 inch tall tires, 4.10 gears' cruising at 70 mph it turns 2300rpm, thinking of going to 4.30 gears, how much would this change my rpm at 70 mph? I still want to drive it on weekends while street light racing, also what about BTE 11 lock up converter anyone using one? I had a 10 inch non lock up but it heated bad on the street.