1999 Nissan Frontier Owner's Manual - Page 127

TRANSFER CASE SHIFTING PROCEDURES FOR 4-WHEEL DRIVE VEHICLES ¼ Driving on dry hard surfaces in 4H or 4L may cause unnecessary noise and tire wear. We recommend driving in the 2H position under these conditions. WARNING ¼ When parking the vehicle, apply the parking brake and always make sure to shift the transfer control lever into the 2H, 4H or 4L position. ¼ Do not leave the transfer control lever in the N (Neutral) position. Otherwise, the vehicle could roll unexpectedly even if the manual transmission is in gear or the automatic transmission is in the P (Park) position. ASD1022 the same conditions as standard 2WD vehicle. 4H - (4WD, high range) Four wheels are driven. Use when driving on roads where it is difficult to drive in the 2H position (i.e., driving at normal speeds on snow covered, icy, wet, muddy or sandy roads). 4L - (4WD, low range) Four wheels are driven. Use when climbing or descending steep hills, or during hard driving in sand, mud or deep snow. The 4L position provides maximum power and traction. Avoid raising vehicle speed excessively, as the maximum speed is approximately 30 MPH (48 km/h). N - No wheels are driven. Always keep the transfer lever out of the N (Neutral) position. Shift the lever quickly and smoothly when moving across the N (Neutral) position with the vehicle stopped. Your NISSAN is equipped with one of two 4WD systems, auto-lock free-running hubs or manual-lock free-running hubs. CAUTION ¼ Do not drive on dry hard surface roads in four-wheel drive. ¼ Failure to engage the transfer control lever in 2H, 4H, or 4L could result in the vehicle moving unexpectedly, which in turn could result in serious personal injury or property damage. 2H - (2WD, high range) Only the rear wheels are driven. Use when driving under Starting and driving 5-19