Explaining Mechanics on Instagram: "Transmission Synchromesh A manual gearbox with synchromesh is designed to make gear changes smoother and easier. 1️⃣ Manual gearbox basics In a manual transmission, different gears transfer engine power and torque to the wheels. Without precision, shifting used to cause that dreaded grinding sound. 2️⃣ The problem Without synchromesh, drivers had to double-clutch to manually match gear speeds. If done wrong, the gears would clash. 3️⃣ The synchromesh solution