Use it on a large road such as a national highway when you are traveling at a speed that allows you to get into the flow. This is a gear used for running at the highest speed such as on expressways. The overdrive gear is used also when you want to drive economically because the number of revolutions of the drive shaft that transmits the driving force to the wheels exceeds the engine revolution number.
However, if the vehicle is not moving fast enough, knocking will occur and it will have an adverse effect on the engine. There is no gear selected. Set the shift knob to this position when parking the car or stopping for a long time such as in a traffic jam. In the neutral state, the car will roll on even a slight hill, so be sure to apply the parking brake when stopping.
By selecting a gear in the opposite gear to the direction in which the car will advance by inertia, it prevents it from moving. It can be used even when the parking brake breaks down. The difficulty with a manual car is "shift change". If the shift change does not go well, the car gets shaky and it may run dangerously. One way to make a smooth shift change is to use the speed of the car as a guide.
If you carry out shift change with the above information as a guide, you can drive smoothly without making the car jerk. If it is a car with a tachometer, one way to know when to change gears is by using the engine speed as a guide.
The following table indicates typical speed and revs for changing gears up or down. As the car increases speed, change up through the gears. When you want to slow down, use the foot brake. Selective gear changing means you sometimes miss out gears, for example, by changing from fifth or fourth gear to second gear.
There are also times when you might selectively change up, for example if you have used a lower gear such as third for better acceleration you might be able to change to fifth gear when you have reached your intended cruising speed.
You can practice this when the car is stationary and the engine is switched off, but make sure that you keep the clutch pedal pressed down to the floor. The gear lever will automatically spring to the central neutral position when not in a gear.
This is very useful when trying to find and select third or fourth gear. To select first gear place your left hand onto the gear lever, palm away from you. Cup your hand around the gear lever and move it across to the left and forward. To move from first to second gear keep your hand on the gear lever, palm away from you, apply slight pressure to the left to stop the gear lever springing back to the central neutral position, and move the gear lever straight back. Probably not. The engine is going to be running faster than normal to make highway speeds in 3rd, if she got going fast enough it was probably pretty loud.
Depending on the vehicle there may be a rev limiter to prevent the engine from running at too high a speed. Teach her to hear what the truck sounds like when it is time to shift if you can.
The actual answer depends upon the final transmission output gear ratio. If fourth is an overdrive gear less than , say 0. But if it is a transmission that does not have an overdrive gear or overdrive is a gear greater than 4th fourth gear trans final output ratio is or greater , then driving in third is not recommended; although, as stated, it can be done with usually minor consequences higher trans temperatures, greater engine wear, decreased fuel economy, and slightly greater chance of engine failure.
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