i just took my 2002 bravada into the shop and had a friend look at it and he hooked it up to the computer and said that the transfer case encoder motor was bad. its the mechanism that switches it from 2wd to awd. i will be doing it myself. its an easy fix but will set you back around 150$ its a few bolts and a plug. it mounts onto the back of your transfer case. good luck.
The 2002 Audi S6 has all wheel drive.
The 2002 Ford Escape has front wheel drive.
The 2002 Subaru Impreza has all wheel drive.
The 2002 Hyundai Accent has front wheel drive.
The 2002 Ford Expedition has rear wheel drive.
The 2002 Porsche 911 has rear wheel drive.
The 2002 Audi S4 has all wheel drive.
The 2002 Audi S8 has all wheel drive.
The 2002 Subaru Legacy has all wheel drive.
The 2002 GMC Savana has rear wheel drive.
The 2002 Nissan Pathfinder has rear wheel drive.
The 2002 Mitsubishi Mirage has front wheel drive.