When removing or replacing a transmission/transaxle, what is the first step?

When removing or replacing a transmission/transaxle, what is the first step?

• A. Disconnect the negative battery cable
• B. Raise the vehicle and support with jack stands
• C. Drain the transmission fluid
• D. Remove the driveshaft

Answer: (A)

Isolating electrical power is the first step. When removing or replacing a transmission, you’ll be working around wiring, sensors, and possibly components that can be energized. Disconnecting the negative battery cable de-energizes the electrical system, which prevents shorts, arcing, or accidental activation of starters, actuators, or airbags while you’re handling wiring and removing heavy components. Once power is cut, you can safely proceed with the rest of the prep and removal steps, such as raising the vehicle for access, draining transmission fluid, and removing the driveshaft, in a safer order.

Isolating electrical power is the first step. When removing or replacing a transmission, you’ll be working around wiring, sensors, and possibly components that can be energized. Disconnecting the negative battery cable de-energizes the electrical system, which prevents shorts, arcing, or accidental activation of starters, actuators, or airbags while you’re handling wiring and removing heavy components. Once power is cut, you can safely proceed with the rest of the prep and removal steps, such as raising the vehicle for access, draining transmission fluid, and removing the driveshaft, in a safer order.