4 wheel drive does not work on 1998 Ford Ranger

The 4 wheel drive does not work. We have checked vaccum and the 'puters but have not found a problem. What else do we need to check?

Asked by for the 1998 Ford Ranger
1 answer
Does your truck have auto hubs on the front? If it does take them off and clean them they are what locks your front axles into your hubs