One problem related to rear suspension coil springs has been reported for the 1998 Ford Ranger. The most recently reported issues are listed below.
The frame on the passenger side from about the middle of the door to the front suspension mount is almost completely gone from rust. I showed it to the Ford dealership and they advised me not to drive as it is extremely unsafe but they either could or would not do anything about it. The coil spring pocket is cracked and the spring is about to pop out. I cannot afford a new vehicle at this time. The frame is broken and cracked in several areas due to stress from flexing because of the rust. I attempted to get a local fabrication shop weld it but they will not touch it. I can take photographs if need be. Ford motor company told me they have had numerous complaints about this same problem but not enough to issue a recall. I am afraid to drive this vehicle but have no choice. I have already replaced rear spring mounts and shackles because of rust but I cannot replace the frame and no one will touch it.