As said above, keep the throttle PINNED throughout the jump to backflip. Your truck needs to be properly tuned though in order for the top end to spin the wheels fast enough. And it's true you need to let off the throttle upon landing to keep your drivetrain in tact. Oh, taller tires make flipping easier too. That's why in almost all the videos the majority of flippers are Traxxas' or HPIs. Those wheels/tires are HUGE...