1998 Toyota Tacoma Owners Manual - Page 92

'98 Tacoma (U) (c) A.D.D. (automatic disconnecting differential) The A.D.D. can be engaged or disengaged by the shifting operations described in "(d) 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. (d) Shifting procedure (lever type with manual 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 D Never move the front drive control lever if wheels are slipping. Stop the slipping or spinning before shifting. D Never drive with only one hub engaged. To shift from "H4" to "H2", simply move the front drive control lever. Also, disengage both the free-wheeling hubs for continued "H2" use. Aluminum wheels This can be done at any vehicle speed. You need not depress the clutch pedal. 92