Moan Groan Noise from Rear Axle – 2005-2007 Ford Mustang

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FORDeBay logo:2005-2007 MustangeBay logo

 

2005-2007 MustangeBay logo GT 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.

 

SERVICE PROCEDURE

  1. First, verify the concern.
    1. Make sure the axle is at full operating temperature.
    2. Perform several full lock turns at low speeds in both directions.
    3. If the noise is verified to be in the rear axle, proceed to Step 2.
    4. 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.
  3. Vehicles built after 10/22/2006 were built with the new limited slip clutch pack. For these vehicles, add 1 bottle of Motorcraft Additive Friction Modifier to the axle. Perform 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.

 

PART NUMBER PART NAME
6L1Z-4947-B
Ford Diff Plate Kit
Ford Diff Plate Kit
  • Genuine FordeBay logo Diff Plate Kit
  • Fit type: Vehicle Specific
  • Model No: 6L1Z4947B
  • item package weight: 2.54 pounds
$150.44 Amazon Prime
Buy on Amazon Price incl. tax, excl. shipping

Last update on 2026-06-09 / Affiliate links / Images from Amazon Product Advertising API

 

Clutch Pack
XL-3
Genuine Ford Fluid XL-3 Friction Modifier Additive - 4 oz.
Genuine Ford Fluid XL-3 Friction Modifier Additive - 4 oz.
  • For use on certain limited-slip differentials to reduce chatter and hypoid gear noise levels
  • Use according to owner guide recommendations
  • Formulated for automotive use
  • Added to lubricants to reduce the surface friction of the lubricated parts
$13.39 Amazon Prime
Buy on Amazon Price incl. tax, excl. shipping

Last update on 2026-06-18 / Affiliate links / Images from Amazon Product Advertising API

 

Motorcraft Additive Friction Modifier

 

Prestone AS800Y DOT 4 Brake Fluid, Synthetic, High Grade, 50,000 Mile, 12 oz.
Prestone AS800Y DOT 4 Brake Fluid, Synthetic, High Grade, 50,000 Mile, 12 oz.
  • 50,000 mile fluid life
  • Prevent overheating & brake fade with high grade formula
  • Protects against performance decline due to water absorption; prevents corrosion of all metals within the braking system
  • Synthetic, extended fluid life formula
  • Size: 12 oz.
Buy on Amazon Price incl. tax, excl. shipping

Last update on 2026-06-10 / Affiliate links / Images from Amazon Product Advertising API

 

Motul RBF 600 Brake Fluid DOT 4 – Racing & High Performance 100% Synthetic Brake Fluid for Cars & Motorcycles, Track Day, Street & Performance Applications 500ml
Motul RBF 600 Brake Fluid DOT 4 – Racing & High Performance 100% Synthetic Brake Fluid for Cars & Motorcycles, Track Day, Street & Performance Applications 500ml
  • For hydraulic actuated brake and clutch systems
  • Non-silicone synthetic fluid
  • Extreme thermal resistance and stability
  • Increase braking performance and avoid brake fade
  • Helps reduce vapour lock with wet boiling point of 399°F (204°C)
$21.83
Buy on Amazon Price incl. tax, excl. shipping

Last update on 2026-06-10 / Affiliate links / Images from Amazon Product Advertising API

 

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