See also:

Five-Speed Automatic Transmission – 5.7L Engine
The shift lever position display (located in the instrument panel cluster) indicates the transmission gear range. You must press the brake pedal to move the shift lever out of the PARK position ...

After Starting
The idle speed is controlled automatically and it will decrease as the engine warms up. ...

How To Disengage The Automatic Locking Mode
Unbuckle the combination lap/shoulder belt and allow it to retract completely to disengage the Automatic Locking Mode and activate the vehicle sensitive (emergency) locking mode. WARNING! • ...