Which statement about current Allison transmissions is true?

Which statement about current Allison transmissions is true?

• A. Mechanically controlled
• B. Electronically controlled
• C. Hydraulically controlled
• D. Sequentially controlled

Answer: (B)

The main concept here is that current Allison transmissions are electronically controlled. A transmission control module reads inputs from sensors such as vehicle speed, engine load, throttle position, and gear demand, and uses that information to decide when to shift. It then sends electronic commands to solenoids that regulate hydraulic pressure in the valve body to engage the appropriate gear. So the control is electronic, while the actual shifting is achieved through hydraulics driven by those electronic commands. That’s why this statement is correct: modern Allisons rely on electronic control to manage shifting decisions, rather than being controlled purely by mechanical linkages, purely by hydraulic logic, or by a fixed sequential process.

The main concept here is that current Allison transmissions are electronically controlled. A transmission control module reads inputs from sensors such as vehicle speed, engine load, throttle position, and gear demand, and uses that information to decide when to shift. It then sends electronic commands to solenoids that regulate hydraulic pressure in the valve body to engage the appropriate gear. So the control is electronic, while the actual shifting is achieved through hydraulics driven by those electronic commands.

That’s why this statement is correct: modern Allisons rely on electronic control to manage shifting decisions, rather than being controlled purely by mechanical linkages, purely by hydraulic logic, or by a fixed sequential process.