1997 Toyota 4Runner Owners Manual - Page 84

(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 automatic transmission) SHIFTING BETWEEN "H2" AND "H4" With free-wheeling hubs To shift from "H2" to "H4", move the front drive control lever. Also, engage both the free-wheeling hubs. This can be done when the vehicle is stopped, or moving straight ahead at speeds of 40 km/h (25 mph) or less. You need not depress the clutch pedal. If you have trouble shifting, depress or release the accelerator pedal momentarily while pushing the front drive control lever. Steel wheels ! 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 vehicle 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 in reverse. Aluminum wheels 83