One problem related to frame rust has been reported for the 1998 Ford Explorer. The most recently reported issues are listed below.
The contact owns a 1998 Ford Explorer. The contact stated the vehicle exhibited rust on the frame of the front doors. When shutting either front door, rust would fracture from the vehicle. The contact did not take the vehicle to the dealer for a diagnosis or repairs. The manufacturer was not contacted. The failure mileage was 56,000 and the current mileage was 61,000.