Drivetrain - Rear End Click/Snap On Light Acceleration
TSB 12-11-1711/29/12
4X4 WITH 145-INCH WHEELBASE - CLICK/SNAP
NOISE ON INITIAL ACCELERATION FROM A STOP -
BUILT ON OR BEFORE 7/15/2012
FORD:
2012 F-150
ISSUE
Some 2012 F-150 4x4 vehicles with a 145-inch wheelbase and built on or before 7/15/2012 may exhibit an intermittent click or snap-type noise from the rear axle on initial light acceleration from a stop in either drive or reverse. The noise may also occur on light acceleration after changing direction from drive to reverse, or reverse to drive.
ACTION
Follow the Service Procedure steps to correct the condition.
SERVICE PROCEDURE
1. Does vehicle exhibit a single click or snap-type noise from the rear axle on light acceleration after the initial engagement into Drive or Reverse, or after stopping to reverse vehicle direction?
a. Yes - Noise is present, proceed to Step 2.
b. No - This article does not apply. Refer to Workshop Manual (WSM), Section 205-00 for normal diagnostics.
2. With the vehicle in neutral, position it on a hoist. For additional information, refer to WSM, Section 100-02.
3. Index-mark the driveshaft flange and pinion flange for correct alignment during installation. (Figure 1)
4. Remove and discard the four (4) driveshaft flange bolts.
a. If new bolts are not available, coat the threads of the original driveshaft flange bolts with Motorcraft(R) Threadlock and Sealer.
5. Using a suitable tool as shown, disconnect the driveshaft centering socket yoke from the pinion flange. (Figure 2)
a. The driveshaft centering socket yoke fits tightly on the pinion flange pilot. Never hammer on the driveshaft or any of its components to disconnect the driveshaft centering socket yoke from the pinion flange. Pry only in the area shown with a suitable tool to disconnect the driveshaft centering socket yoke from the pinion flange.
6. Using mechanics wire, support and position the driveshaft aside.
7. Install Drive Pinion Flange Holding Fixture (205-126) to the pinion flange. (Figure 3)
8. Make an index mark on the pinion nut and the pinion flange, then make a second mark on the pinion flange 90 degrees clockwise from the initial mark. (Figure 3)
9. While holding the pinion flange, tighten the pinion nut 90 degrees clockwise to align with the mark made in step 8.
10. Position the driveshaft to the pinion flange and align the index marks. (Figure 1)
11. Install four (4) new driveshaft flange bolts and tighten to 103 N.m (76 lb-ft).
a. If new bolts are not available, coat the threads of the original driveshaft flange bolts with Motorcraft(R) Threadlock and Sealer.
b. The driveshaft centering socket yoke fits tightly on the pinion flange pilot. To make sure the driveshaft centering socket yoke seats squarely on the pinion flange, tighten the driveshaft flange bolts evenly in a cross pattern.
12. Apply a few drops of Motorcraft(R) Penetrating and Lock Lubricant to each of the driveshaft universal joint retaining clips and wipe off excess.
WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage Warranty/ESP coverage limits/policies/prior approvals are not altered by a TSB. Warranty/ESP coverage limits are determined by the identified causal part and verified using the OASIS part coverage tool.
OPERATION DESCRIPTION TIME
121117A 2012 F-150 4X4: Follow 0.4
Service Procedure To
Adjust Pinion Bearing
Preload (Do Not Use With
Any Other Labor
Operations)
DEALER CODING
CONDITION
BASIC PART NO. CODE
4670 41
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