2004 GMC Yukon Owner's Manual - Page 125

Shifting Out of 4LO To shift from 4LO to 4HI, AUTO 4WD or 2HI your vehicle must be stopped or moving less than 3 mph (4.8 km/h) with the transmission in NEUTRAL (N) and the ignition in RUN. The preferred method for shifting out of 4LO is to have your vehicle moving 1 to 2 mph (1.6 to 3.2 km/h). Press and release the 4HI, AUTO 4WD or 2HI button. You must wait for the 4HI, AUTO 4WD or 2HI indicator light to stop flashing and remain illuminated before shifting your transmission into gear. Notice: Shifting the transmission into gear before the 4LO indicator light has stopped flashing could damage the transfer case. To help avoid damaging your vehicle, always wait for the 4LO indicator light to stop flashing before shifting the transmission into gear. It is typical for your vehicle to exhibit significant engagment noise and bump when shifting between 4LO and 4HI ranges or from NEUTRAL with the engine running. If the 4HI, AUTO 4WD or 2HI switch is pressed when your vehicle is in gear and/or moving, the 4HI, AUTO 4WD or 2HI indicator light will flash for 30 seconds but will not complete the shift unless your vehicle is moving less than 3 mph (4.8 km/h) and the transmission is in NEUTRAL (N). Shifting into NEUTRAL To shift the transfer case to NEUTRAL do the following: 1. Make sure the vehicle is parked so that it will not roll. 2. Set the parking brake. 3. Start the vehicle or turn the ignition to RUN. 4. Connect the vehicle to the towing vehicle. 5. Put the transmission in NEUTRAL (N). 6. Shift the transfer case to 2HI. 7. Simultaneously press and hold the 2HI and 4LO buttons for 10 seconds. The red NEUTRAL light will come on when the transfer case shift to NEUTRAL is complete. 8. Shift the transmission to REVERSE (R) for one second, then shift the transmission to DRIVE (D) for one second. 9. Turn the ignition to LOCK. 10. Place the transmission shift lever in PARK (P). 11. Release the parking brake prior to towing. 2-31