Hmm I heard about truckers doing that, but I never heard how you can upshift/downshift without pressing the clutch in regular cars.
Anyone wants to tell me how to do it?
Very interesting topic in my opinion.
It's easy to upshift/downshift without a clutch. To shift up, accelerate to a reasonable RPM, pull the shifter out of gear and pull/push toward next gear using light pressure. Once the engine and tranny match revolutions, the shifter will continue into the next gear. Down shifting is done the same way, but after you pull the shifter out of gear, rev the engine then pull/push shifter with light pressure toward next gear until the revolutions match and it drops into gear. It can be done with cars, but it's not recommended because it will mess up the syncros. I drive dump trucks and tractor trailers everyday, so I use this method all the time, otherwise my left foot gets quite tired after a day of work, up and down the gears.