Final answer:
When starting up a steep grade, it is recommended to shift into a lower gear, usually either second or third gear, depending on the specific steepness of the grade. Shifting into a lower gear increases the torque and power delivered to the wheels, allowing the vehicle to climb the grade more easily.
Step-by-step explanation:
When starting up a steep grade, it is recommended to shift into a lower gear, usually either second or third gear, depending on the specific steepness of the grade. Shifting into a lower gear increases the torque and power delivered to the wheels, allowing the vehicle to climb the grade more easily.
By shifting into a lower gear, the engine can operate at a higher RPM range, which generates more power. This is important because the engine needs extra power to overcome the resistance caused by gravity when climbing a steep grade.
In addition to shifting into a lower gear, it is also important to maintain a steady speed and avoid sudden acceleration or braking while ascending a steep grade. Gradual acceleration and maintaining a consistent speed will help the vehicle maintain traction and prevent it from stalling or slipping on the grade.