This article supersedes TSB 04-25-7 to update the vehicle model years.
Some 2004-2006 F-150 and 2006 Mark LT vehicles (excluding F-150 Heritage) may exhibit a vehicle / steering wheel vibration (not nibble) at 50 MPH (80 Km/h) or higher, or a steering wheel nibble (side-to-side or rotational oscillation) at 65 MPH (105 Km/h) or higher.
Follow the Service Procedure steps to correct the condition.
Refer to the Diagnostic Overview (Figure 1). Based on the customer's description of the concern, find the appropriate operating condition, probable cause, and repair action.
NOTE: IT IS CRITICAL TO IDENTIFY SPECIFIC VEHICLE SPEEDS AND OPERATING CONDITIONS WHEN THE VIBRATION OR NIBBLE IS OCCURRING, TO PROPERLY DIAGNOSE AND REPAIR THE ISSUE. TIRE AND DRIVELINE VIBRATION CAN FEEL SIMILAR. USE OF AN ELECTRONIC VIBRATION ANALYZER (EVA) OR VETRONIX VIBRATION ANALYZER IS RECOMMENDED TO CORRECTLY IDENTIFY VIBRATION SOURCES (ORDERS) AND FREQUENCY (HZ).
NOTE: NIBBLE CANNOT BE ELIMINATED WITHOUT ADDRESSING PROPER TIRE AND WHEEL BALANCE.
This only applies to new F-150's and the Lincoln mark trucks