How a Shifter Works

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Here's how an automatic transmission shifter works in a car.

The purpose of the gear selector is to:
1) Select the appropriate transmission position. (P,R,N,D)
2) Protect the transmission of the vehicle.
3) Prevent the vehicle from rolling away.

The gear level is comprised of a plastic base with a pivot point that leads to the control rod connecting the shift knob. The unlock button on the shift knob connects to a rod with a cross-brace that performs lockout functions. The shift solenoid and relay activates when conditions are met, e.g. when the brake is pressed and ignition is on and activates a cam to unlock the cross-brace.

The brake and shift button must be depressed for certain combinations of gear changes. This shifter also has a parallel sport mode that allows for the selection of forward gear ratios manually. The shifter has a few limit switches built in that determine what position it is in: park, sport, gear up + or gear down -. This information, along with the solenoid is fed to the ECU, as there is no onboard shift controller.

This video demonstrates the removal and disassembly of the automatic transmission gear selector on a 2004 Infiniti G35 RWD.
To see what's inside a Toyota Corolla's automatic transmission shifter by comparison, see this video:


Get your automatic transmission fluid here:
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Metric socket set:
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Lubrication grease for moving shifter components:
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This is the Camera I use:
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