Fulltext TSBs

Technical Service Bulletins

TSB
08-21-11
  • 4 WHEEL DRIVE/ALL WHEEL DRIVE – WITH CONTROL TRAC – SHUDDER ON ACCELERATION/DECELERATION OR BINDING ON SLOW TURNS
Publication Date: October 10, 2008

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

NOTE:THIS DOES NOT APPLY TO 2006-2008 MOUNTAINEER WITH A 4.0L ENGINE OR 2007-2008 EXPLORER AND SPORT TRAC WITH 20 INCH WHEELS.

NOTE:VEHICLES ON THE LIST MAY REQUIRE REPLACEMENT OF TIRE/S IF THE TIRE CIRCUMFERENCE AVERAGE BETWEEN THE FRONT AND REAR AXLES ARE OUTSIDE OF THE 1/2 INCH SPECIFICATION OR IF THE TIRE CIRCUMFERENCE FROM SIDE TO SIDE ON EITHER AXLE EXCEEDS 1/2 INCH DIFFERENCE, THE SMALLER TIRE(S) MUST BE REPLACED.

NOTE:REVIEW THE WARRANTY AND POLICY MANUAL FOR FORD MOTOR COMPANY TIRE REPLACEMENT WARRANTY BEFORE PERFORMING THE SERVICE PROCEDURE.

NOTE:ONLY USE REPLACEMENT TIRE AND WHEEL THAT ARE THE SAME SIZE, LOAD INDEX, SPEED RATING AND TYPE (SUCH AS P-METRIC VERSUS LT-METRIC OR ALL-SEASON VERSUS ALL-TERRAIN) AS THOSE ORIGINALLY PROVIDED BY FORD. THE RECOMMENDED TIRE AND WHEEL SIZE MAY BE FOUND ON EITHER THE SAFETY COMPLIANCE CERTIFICATION LABEL OR THE TIRE LABEL WHICH IS LOCATED ON THE B-PILLAR OR EDGE OF THE DRIVER'S DOOR.

NOTE:ON SOME 4WD MODELS, THE INITIAL SHIFT FROM 2WD TO 4WD WHILE THE VEHICLE IS MOVING CAN CAUSE A MOMENTARY CLUNK AND/OR BRIEF RATCHETING SOUND. THESE SOUNDS ARE NORMAL AS THE FRONT DRIVETRAIN COMES UP TO SPEED AND IS NOT CAUSE FOR CONCERN.

  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?
    1. If the shudder/binding is still present, do not contine with this procedure, continue with WSM normal diagnostic for 4X4.
    2. 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. (Figure 1)


    Figure 1 – Article 08-21-11

  9. Calculate the average of the circumference of the two (2) front tires and calculate the average of the circumference of the two (2) rear tires. (Figure 2)


    Figure 2 – Article 08-21-11

  10. If the difference between these two averages is greater than 1/2″ (12.7 mm), front to back or side to side, replace the smallest circumference tire(s) and remeasure the tire averages. Refer to WSM, Section 204-04 for tire replacement.

    NOTE:WARRANTY COVERAGE ELIGIBILITY STARTS WITH 2007 NEW VEHICLE LIMITED WARRANTY COVERAGE.

WARRANTY STATUS:

Eligible Under Provisions Of New Vehicle Limited Warranty Coverage
IMPORTANT: Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.

OPERATIONDESCRIPTIONTIME
082111A2003-2008 Expedition, Navigator, 2003-2005 Aviator,Explorer, Mountaineer 4X4: Perform Diagnosis Outlined In Service Procedure And Replace One (1)Tire (Do Not Use With 1007A)1.1 Hrs.
082111A1997-2002 Expedition, 1998-2002 Navigator, 2006-2008 F-150 Harley Davidson, Mountaineer, 1997-2008 Explorer, 2007-2008 Explorer Sport Trac, And 2008 F-150 Limited 4X4: Perform Diagnosis Outlined In Service Procedure And Replace One (1) Tire (Do Not Use With 1007A)1.0 Hr.
082111B2003-2008 Expedition, Navigator, 2003-2005 Aviator, Explorer, Mountaineer 4X4: Perform Diagnosis Outlined In Service Procedure And Replace TWO Tires. (Do Not Use With 1007A)1.4 Hrs.
082111B1997-2002 Expedition, 1998-2002 Navigator, 2006-2008 F-150 Harley Davidson, Mountaineer, 1997-2008 Explorer, 2007-2008 Explorer Sport Trac, And 2008 F-150 Limited 4X4: Perform Diagnosis Outlined In Service Procedure And Replace Two (2) Tires (Do Not Use With 1007A)1.2 Hrs.
082111C2003-2008 Expedition, Navigator, 2003-2005 Aviator, Explorer, Mountaineer 4X4: Perform Diagnosis Outlined In Service Procedure And Replace Three (3) Tires (Do Not Use With 1007A)1.7 Hrs.
082111C1997-2002 Expedition, 1998-2002 Navigator, 2006-2008 F-150 Harley Davidson, Mountaineer, 1997-2008 Explorer, 2007-2008 Explorer Sport Trac, And 2008 F-150 Limited 4X4: Perform Diagnosis Outlined In Service Procedure And Replace Three (3) Tires (Do Not Use With 1007A)1.4 Hrs.

DEALER CODING

BASIC PART NO.CONDITION CODE
7A19542