NHTSA Investigation RQ98022

REAR SUSPENSION SPRING BREAKAGE

IN JULY 1998, FORD SUBMITTED A PART 573 NOTIFICATION TO NHTSA CONCERNING BROKEN REAR SPRINGS ON CERTAIN 1997-98 FORD F150 TRUCKS, WITH FOUR-WHEEL DRIVE.FORD STATED THAT FATIGUE FRACTURE OF THE REAR SPRINGS MAY OCCUR IF THE SPRING ARE OVER STRESSES(SIC) BY VEHICLE OVERLOADING.THE BROKEN PIECE OF THE SPRING LEAF MAY SPLAY INWARD, DAMAGING THE FUEL TANK AND CAUSING FUEL LEAKAGE.FORD ALSO STATED THAT A BROKEN SPRING WOULD CAUSE VEHICLE SAG AND LOSS IN LOAD CARRING CAPABILITY.FORD HAD 43 REPORTS OF FUEL TANK DAMAGE.FORD WILL INSTALL A CLIP ON THE FORWARD END (ONLY) OF THE REAR SPRINGS TO PREVENT FUEL TANK CONTACT IN THE EVENT OF A LEAF FRACTURE.ONLY BROKEN SPRINGS WILL BE REPLACED.ODI HAS RECEIVED THREE REPORTS OF BROKEN REAR SPRINGS ON 1997-98 F150 TRUCKS;TWO OF THEM HAVE TWO-WHEEL DRIVE.A TIRE PUNCTURE OCCURRED ON A FOUR-WHEEL DRIVE TRUCK IN WHICH THE BROKEN MIDDLE SPRING LEAF SPLAYED OUTWARD AT THE REAR OF THE SPRING ASSEMBLY.EIGHT OTHER REPORTS DESCRIBE REAR SPRINGS THAT HAVE MOVED OUT OF POSITION OR BECAME LOOSE; THREE OF THESE REPORTED SOME LOSS OF VEHICLE CONTROL.CLOSING NOTE: WHILE THERE ISN'T ANY STRONG EVIDENCE THAT THE REAR SPRINGS ARE ONLY BREAKING UNDER CONDITIONS OF OVERLOAD AND SEVERE USE, THE RECALL REMEDY TO PREVENT FUEL TANK DAMAGE MAY BE ADEQUATE AND THERE IS NOT A SIGNIFICANT SPRING FAILURE RATE OUTSIDE THE RECALL POPULATION.THI RQ SHOULD BE CLOSED, SUBJECT TO FUTURE FAILURE OCCURANCES.

An investigation is a separate record from a recall and from a manufacturer communication. A manufacturer campaign to repair a safety defect or a failure to meet a federal safety standard.