1999 Ford F350 Owner Guide 4th Printing - Page 127
1999 Ford F350 Manual
Page 127 highlights
Driving Shifting from 2H (2WD high) to 4H (4WD high) Engage the locking hubs by rotating the hub lock control from FREE to LOCK, then move the transfer case lever from 2H (2WD High) to 4H (4WD High). Do not shift into 4H (4WD High) with the rear wheels slipping. 2H 4H N 4L Shifting from 4H (4WD high) to 2H (2WD high) Move the transfer case lever to 2H 2H (2WD High) at a stop or any forward speed up to 88 km/h (55 4H mph). N With the vehicle at complete stop, disengage the locking hubs 4L (optional) by rotating the hub lock control from LOCK to FREE. Shifting from 4H (4WD high) to 4L (4WD low) 1. Bring the vehicle to a complete stop. 2. Depress the brake. 3. Place the gearshift lever in N (Neutral) (automatic transmission) or depress the clutch (manual transmission). 127