Download FORD: 1997-2008 Expedition, Explorer 2006-2008 F-150 2007-2008 Explorer Sport Trac 2008 F-150 LINCOLN: 1998-2008 Navigator 2003-2005 Aviator MERCURY: 2005 Mountaineer 2006-2008 Mountaineer. ISSUE: Various 1997-2008 vehicles equipped with either 4 wheel drive or all wheel drive and equipped with control trac may exhibit a shudder on acceleration/deceleration, binding in slow speed turns or noise from the front driveline and/or transfer case. The shudder/binding will occur with the vehicle being operated in the awd/auto 4×4 mode. The shudder/binding may be due to incorrect tire circumference or improper tire inflation pressures. ACTION: Follow the Service Procedure steps to correct the condition. SERVICE PROCEDURE 1. Review the tire label for correct tire size and tire inflation pressures located at the B-Pillar of the driver’s door. 2. If the tire size does not match the label, this procedure does not apply, follow normal Workshop Manual (WSM) diagnostics. 3. If the tire size is correct, ensure tire pressures are within specifications. 4. Raise the vehicle on the hoist, refer to Workshop Manual, Section 100-02. 5. Disconnect all wiring going to the transfer case and road test. 6. Is the shudder/binding present? a. If the shudder/binding is still present, do not contine with this procedure, continue with WSM normal diagnostic for 4X4. b. If the shudder/binding is gone, proceed to Step 7. 7. Raise the vehicle on the hoist and reconnect all the wiring previously disconnected. 8. Using a tailor’s tape or flexible measuring tape and measure the circumference of all four (4) tires and record the measurements.