2.3 – Shifting Gears Correct shifting of gears is important. If you can't get your vehicle into the right gear while driving, you will have less control. 2.3.1 – Manual Transmissions Basic Method for Shifting Up. Most heavy vehicles with manual transmissions require double clutching to change gears. This is the basic method Release accelerator, push in clutch and shift to neutral at the same time. Release clutch. Let engine and gears slowdown to the rpm required for the next gear (this takes practice. Push in clutch and shift to the higher gear at the same time. Release clutch and press accelerator at the same time. Shifting gears using double clutching requires practice. If you remain too long in neutral, you may have difficulty putting the vehicle into the next gear. If so, don't try to force it. Return to neutral, release clutch, increase engine speed to match road speed, and try again.