Float shifting

Float shifting or floating gears, also called "slip shifting", "dead sticking" or "bang shifting", is the process of changing gears, typically in a non-synchronous transmission, without depressing the clutch.

The most skillful drivers can shift non-synchronous transmissions without using the clutch by bringing the engine to exactly the right RPM in neutral before attempting to complete a shift.

If done improperly, it can damage or destroy a transmission.

If an experienced driver attempts this, they are less likely to cause damage than a driver new to the concept.

Some truck (lorry) drivers use this technique with the higher gears when at work.

Technique

To upshift, the driver must bring the engine up to speed before attempting this. They must shift to neutral and apply moderate pressure to the gear stick and when the RPM is low enough, the shifter will slide into place. The same technique for shifting down is used except that the accelerator must have some pressure applied to it to bring the RPM up to match the speed of that gear at that wheel speed.