1996 GMC Sonoma Owner's Manual - Page 68

'our-V ve (ODtion) Manual Transfer Case If your vehicle has four-wheel drive, you can send your engine's driving power to all four wheels for extra traction. To shift out of two-wheel drive and into four-wheel drive, move the transfer case shift lever to 4HI or 4LO. You should use 2HI for most normal driving conditions. NOTICE: Driving in the 4HI or 4LO positions fora long time on dry or wet pavement could shorten the life of your vehicle's drivetrain. If your four-wheel-drive vehicle has the manual transfer case, the transfer case shift lever is on the floor next to the driver. Use this lever to shift into and out of four-wheel drive. 2-20