1997 Mercury Grand Marquis Owner Guide 1st Printing - Page 168

To return the transmission to normal operation (1st through 4th gear) depress the TCS again. This switch may be used to cancel overdrive any time the vehicle is being driven. Each time your vehicle is started, the overdrive system will automatically be in the normal overdrive mode and the light will not be illuminated. When to use j (Overdrive) Overdrive is the usual driving position for an automatic overdrive transmission. It works the same way Drive works, automatically upshifting or downshifting as the vehicle speeds or slows. However, Overdrive also shifts into a fourth gear -an overdrive gear - when your vehicle cruises at an appropriate consistent speed for any length of time. This fourth gear will increase your fuel economy when you travel at cruising speeds. When to use j (Overdrive) - with Transmission Control Switch activated (TCS) Overdrive may not be appropriate for certain terrain. If the transmission shifts back and forth between Third and Fourth gears while you are driving on hilly roads or if your vehicle does not have adequate power for climbing hills, press the TCS located on the shift lever. You can depress the TCS at any speed. When to use 2 (Second) Use 2 (Second) for start-up on slippery roads or to give you more engine braking to slow your vehicle on downgrades. 168