Section 112 (Locking Hubs - Automatic): Description
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1991 GMC Suburban, 1991 GMC Pickup, 1991 GMC Jimmy, 1991 GMC Cab & Chassis, and 1991 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
Automatic locking hub engages or disengages front axle shaft with front hub. Shifting transfer case into 4WD engages automatic locking hubs. Hub will remain engaged during coasting or downhill operation. Hub disengages when transfer case is shifted into 2WD, and when vehicle is slowly moved rearward several feet.