2007 Toyota Tundra Owners Manual - Page 258

07 04.26 (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 SHIFTING BETWEEN "2WD" AND "4H" To shift from "2WD" to "4H", reduce the vehicle speed to less than 100 km/h (62 mph) and turn the front drive control switch knob fully clockwise. When the ambient temperature is −15_C (5.0_F) or lower, shifting can be performed with the vehicle speed below 70 km/h (43 mph). If the "4HI" (high speed four −wheel drive) indicator light continues to blink when you operate the front drive control switch knob from the "2WD" to the "4H" position, this reminds you that the transfer mode is not securely in "4H" mode. Drive straight ahead while accelerating or decelerating. If the "4HI" (high speed four −wheel drive) indicator light continues to blink and the buzzer sounds when you operate the front drive control switch knob from the "2WD" to the "4H" position, this reminds you that the transfer mode is not in "4H" mode. Stop the vehicle or reduce the vehicle speed to less than 100 km/h (62 mph). (When the ambient temperature is −15_C (5.0_F) or lower, it needs to be reduced to below 70 km/h (43 mph).) Operate the switch knob again. CAUTION Never operate the front drive control switch knob if the wheels are slipping. Stop the slipping or spinning before operating. To shift from "4H" to "2WD", reduce the vehicle speed to less than 100 km/h (62 mph) and turn the front drive control switch knob fully counterclockwise. When you operate the front drive control switch knob from "4H" to "2WD" with the vehicle speed at 100 km/h (62 mph) or higher, the "4HI" indicator light continues to blink and buzzer sounds. When the switch knob is returned from "2WD" to "4H", the indicator light turns off and the buzzer stops sounding. If the "4HI" (high speed four −wheel drive) indicator light continues to blink when you operate the front drive control switch knob from the "4H" to the "2WD" position, this reminds you that the transfer mode is not securely in "2WD" mode. Drive straight ahead while accelerating or decelerating, or drive forward or backward in a short distance. 240 2007 TUNDRA from Jul. '07 Prod. (OM34463U)