Automatic Locking Hub
WARNING: This page does not describe the selected car, but rather 19 other vehicles, including the 2001 Isuzu VehiCROSS, 2001 Isuzu Trooper, 2001 Isuzu Rodeo Sport, 2001 Isuzu Rodeo, and 2001 Honda Passport. However, it is still accessible from the selected car via links, so may be relevant.
See AUTOMATIC LOCKING HUB (SHIFT-ON-THE-FLY SYSTEM) under REMOVAL & INSTALLATION in DISC & DRUM - AMIGO, OASIS & RODEO article in BRAKES.