The gear ratio of a Toyota automatic transmission is the ratio of the number of revolutions made by the transmission input shaft to the number of revolutions of the output shaft. It determines the mechanical gain and transmitted torque for each gear.
Types of gears in Toyota automatic transmission:
* Neutral (N) – the input and output shafts are not connected, there is no transmission of torque to the wheels.
* Drive (D) – main gear for forward movement. The gear ratio varies depending on the gear.
* Manual (M) – the driver selects the gear manually. The gear ratio corresponds to the selected gear.
*Line/Hold (L) – Used to provide increased torque when driving at low speeds or holding the vehicle on a slope. Has the lowest gear ratio.
* Rear (R) – for moving backwards. Has the highest gear ratio.
Toyota automatic transmission gear ratios:
Specific gear ratios for Toyota automatic transmissions may vary depending on the model and year of manufacture of the vehicle. Below are some common examples:
Automatic transmission model: U150E
* Neutral (N): 0.00:1
* Drive (D):
* 1st gear: 3.33:1
* 2nd gear: 1.94:1
* 3rd gear: 1.34:1
* 4th gear: 0.87:1
* 5th gear (OD): 0.67:1
*Lowdown (L): 4.18:1
* Rear (R): 3.33:1
The automatic transmission gear ratio serves several purposes:
* Engine speed control – it allows the engine to operate at the optimal speed for a given speed and load.
* Maximizing Torque – Low gear ratios provide more torque to the wheels for acceleration or overcoming loads.
* Fuel Efficiency – High gear ratios reduce engine speed and fuel consumption when driving at high speeds.
* Smooth gear shifting – Optimal gear ratios allow the automatic transmission to shift smoothly, providing comfort and fuel efficiency.