Drivetrain - Differential Moan/Groan On Low Speed Turns

TSB 08-5-10

03/17/08

8.8 LIMITED SLIP AXLE MOAN/GROAN NOISE DURING LOW SPEED TURNING MANEUVERS

FORD:
2005-2007 Mustang

This article supersedes TSB 07-22-08 to update the Part List.

ISSUE
Some 2005-2007 Mustang GI vehicles equipped with the 8.8 inch limited slip axle may exhibit a moan/groan noise when making tight low speed turns. This may be more noticeable when the axle is at full operating temperature. The noise may also be confused as originating from the brakes or steering system.

ACTION

Follow the Service Procedure steps to correct the condition.

SERVICE PROCEDURE

1. First, verify the concern.

a. Make sure the axle is at full operating temperature.

b. Perform several full lock turns at low speeds in both directions.

c. If the noise is verified to be in the rear axle, proceed to Step 2.

d. If the concern can not be verified or the noise is not coming from the rear axle assembly, do not continue with this TSB and follow normal diagnostics in the Workshop Manual (WSM).

2. For vehicles built before 10/22/2006, replace the limited slip clutch pack. Install the new limited slip clutch pack kit following the procedures in the Mustang WSM, Section 205-02B (Differential Carrier Removal and Differential Case/Ring Gear Disassembly).

3. Vehicles built after 10/22/2006 were built with the new limited slip clutch pack. For these vehicles, add 1 bottle of Motorcraft(R) Additive Friction Modifier to the axle. Per[orm several full lock turns at low speeds in both directions to force the lubricant into the limited slip clutch pack.

NOTE
DO NOT INSTALL NEW LIMITED SLIP CLUTCH PACKS IN VEHICLES BUILT AFTER 10/22/2006.





Parts Block

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.

OPERATION DESCRIPTION TIME

080510A 2005-2007 Mustang Built 1.0 Hr.
After 10/22/2006: Add
Friction Modifier, Includes
Time For Road Test (Do
Not Use With 4205A,
4205A4, 4205A12,
4205A13, 4234A)

080510B 2005-2007 Mustang Built 3.3 Hrs.
Before 10/22/2006: Install
The Limited Slip Clutch
Pack, Includes Time For
Road Test (Do Not Use
With 4205A, 4205A4,
4205A12, 4205A13,
4234A)

DEALER CODING
CONDITION
BASIC PART NO. CODE
4947 D4





Disclaimer