The _______________reduces the speed of all shafts to engage the 1-2 synchronizer to the first speed gear.

The gearbox reduces the speed of all shafts to engage the 1-2 synchronizer to the first speed gear. In a vehicle's transmission system, the gearbox plays a crucial role in controlling the power and speed transferred from the engine to the wheels. By selecting appropriate gears, it allows the driver to efficiently manage torque and velocity, facilitating smooth acceleration and deceleration.

The synchronizer is a key component that ensures smooth engagement of gears by matching the speeds of the gears involved. In this context, the reduction of speed by the gearbox allows the synchronizer to effectively engage the first gear without grinding or a sudden jolt, improving the overall driving experience.