1998 GMC Savana Van Owner's Manual - Page 100

Shifting Out of PARK (P) Your vehicle has a brake-transmission shift interlock system. You have to fully apply your regular brakes before you can shift from PARK (P) when the ignition is in RUN. See "Automatic Transmission" in the Index. If you cannot shift out of PARK (P), ease pressure on the shift lever and push the shift lever all the way up into PARK (P) as you maintain brake application. Then, move the shift lever into the gear you want. If you ever hold the brakepedal down but still can't shift out of PARK (P), try this: 1. Turn the key to OFF. 2. Apply and hold the brake until the end of Step 4. 3. Shift to NEUTRAL (N). 4. Start the vehicle and then shift to the drive gear you want. 5. Have the brake-transmission shift interlock system fixed as soon as you can. 2-28