Shifting gears on most heavy vehicles using manual transmissions will require _________.

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 slow down 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.