2003 Toyota Tundra Owners Manual - Page 440

'03 TUNDRA_U (L/O 0301) (b) A.D.D. (automatic disconnecting differential) The A.D.D. can be engaged or disengaged by the shifting operations described in "(c) Shifting procedure". You should drive in four-wheel drive for at least 16 km (10 miles) each month. This will assure that the front drive components are lubricated. (c) Shifting procedure (lever type with manual transmission) SHIFTING BETWEEN "H2" AND "H4" To shift from "H2" to "H4", reduce the vehicle speed to less than 80 km/h (50 mph) and move the front drive control lever. If the indicator light does not come on when you shift the transfer into "H4", drive straight ahead while accelerating or decelerating, or drive forward or backward in a short distance. You need not depress the clutch pedal. If you have trouble shifting in cold weather, reduce the vehicle speed or stop the vehicle and reshift. SHIFTING BETWEEN "H4" AND "L4" To shift from "H4" to "L4", stop the vehicle or reduce the vehicle speed to less than 8 km/h (5 mph). With your foot off the accelerator pedal, depress the clutch pedal and move the front drive control lever. To shift from "L4" to "H4", depress the clutch pedal and move the front drive control lever. This can be done at any speed. CAUTION Never move the front drive control lever if wheels are slipping. Stop the slipping or spinning before shifting. To shift from "H4" to "H2", simply move the front drive control lever. This can be done at any speed. You need not depress the clutch pedal. If the indicator light does not go off when you shift the transfer into "H2", drive straight ahead while accelerating or decelerating, or drive forward or backward in a short distance. 120 2003 TUNDRA from Jan. '03 Prod. (OM34421U)