In my ZX3, I am replacing the older Zetec 2.0L DOHC engine with a new, less used one. I am trying to achieve more horsepower and a faster car in general. Aside from installing air intakes, new exhaust and everything else, there is another catch. Even right now, my car, with 5-speed transmission, can only get up to about 90mph in 5th gear at around 4000rpm. I am told that I would need a new transmission to be able to change the gear ratio since the stock one has no settings to change the ratio. How much and looking on spending? AND WHERE CAN I FIND A TRANSMISSION TO FIT MY CAR? 2003, Ford Focus ZX3, Engine code 3, 2.0L 4cyl Vetec gasoline engine.