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NHTSA ID Number: 10201637
Manufacturer Communication Number: TSB 21-2330
Summary
Some 2020 Mustang
GT350 – 2020-2021 Mustang Mach 1/Shelby GT500 vehicles may exhibit a rear differential fluid leak at the differential cooler line fittings. This may be due to a seal within the fittings. To correct the condition, follow the service procedure to replace both rear differential cooler line fittings.
Model:
2020-2021 Mustang Mach 1
2020 Mustang Shelby GT350
2020-2021 Mustang Shelby GT500
Issue: Some 2020 Mustang Shelby GT350, 2020-2021 Mustang Mach 1/Shelby GT500 vehicles may exhibit a rear differential fluid leak at the differential cooler line fittings. This may be due to a seal within the fittings. To correct the condition, follow the service procedure to replace both rear differential cooler line fittings.
Action: Follow the Service Procedure steps to correct the condition on vehicles that meet the following criteria:
- One of the following vehicles:
- 2020 Mustang Shelby GT350
- 2020-2021 Mustang Mach 1
- 2020-2021 Mustang Shelby GT500
- Rear differential fluid Leak at the cooler line fittings located on the rear axle assembly
NOTE: Part quantity refers to the number of that service part number required, which may be different than the number of individual pieces. Service part numbers contain 1 piece unless otherwise stated. “As Needed” indicates the part is required but the number may vary or is not a whole number; parts can be billed out as non-whole numbers, including less than 1.
Parts
| Service Part Number | Quantity | Description | |
| MR3Z-6K741-A | 2 | Oil Cooler Adapter | Package Contains 1 Piece, 2 Pieces Required |
XY-75W85-QL  | As Needed | Motorcraft® SAE 75W-85 Premium Synthetic Hypoid Gear Lubricant | – |
| XL-3 | As Needed | Motorcraft® Additive Friction Modifier | – |
Service Procedure
1. Disconnect the cooler lines from the rear axle housing. Refer to Workshop Manual (WSM), Section 205-02 Rear Drive Axle/Differential > Removal and Installation > Axle Assembly > Removal Steps 8-9. The differential fluid will drain out of the axle assembly during this step.
2. Remove and discard both fittings from the axle housing.
3. Install the new fittings. Tighten both fittings to 23 Nm (17 lb-ft).
4. Reinstall the cooler lines. Refer to WSM, Section 205-02 Rear Drive Axle/Differential > Removal and Installation > Axle Assembly > Installation Steps 4-6.
5. Refill the axle to the proper fill level. Refer to WSM Section 205-02 Rear Drive Axle/Differential > General Procedures > Differential Fluid Level Check.
2 Affected Products
Vehicle
1 Associated Document
Manufacturer Communications
21-2330
23 September 2021
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- Mobil 1 Synthetic Gear Lube LS is a supreme performance, synthetic, multipurpose, automotive gear lubricant
- Meet or exceed the highest level of performance requirements of many modern passenger vehicles – including limited slip applications
- Helps protect against thermal and oxidative degradation, wear and corrosion, and viscosity loss associated with premature shearing
- Promotes outstanding power transfer performance - even in some of the most severe driving conditions
- Sold as 6 pack
- SATISFIES REQUIREMENTS - for gear oil viscosity of SAE 75W80, 75W, 80W and 85W, as well as SAE 30 and SAE 10W30 motor oil
- APPLICATIONS - include differential oil, final drive oil, gear oil and transfer case fluid, this product is not designed for use in most manual transmissions or transaxles with synchronizers, as extreme slipperiness may cause shifting problems
- CONTAINS - additional friction modifiers for suitability with clutch-type limited slip differentials - for most LSDs, no additional friction modifiers are required, known formerly as LightWeight Gear Oil
- POPULAR GEAR OIL FOR - in many late model BMW, Dodge, Ford, GM, Jeep, Lexus, Mercedes-Benz, Ram, Toyota, also popular in many Formula racing transaxles, including Hewland LD-200 and FTR sequential
- WHY RED LINE - Established in 1979, Red Line Products perform & protect better than any on the market. No compromises
- Motorcraft Rear Axle Oil - XY75W85QL
- Item Package Dimension: 10.39L x 4.45W x 2.72H inches
- Item Package Weight - 1.96 Pounds
- Item Package Quantity - 1
- Product Type - MACHINE LUBRICANT
- Mobil 1 Synthetic Gear Lube Ls 75W-90 Mobil 1 Synthetic Gear Lube Ls 75W-90 Is A Supreme Performance, Synthetic, Multi-Purpose, Sae 75W-90 Automotive Gear Lubricant Designed To Meet The Highest Level Of Performance Requirements Of Modern Passenger Vehicles In All Types Of Operating Conditions, Including Limited Slip Applications, As Well As Delivering Outstanding Power Transfer Performance
- Compared To Conventional Hypoid Gear Lubricants, Mobil 1 Synthetic Gear Lube Ls 75W-90 Performs Exceptionally Well Over A Wide Range Of Temperatures
- Through Creativity, Productivity And Innovation - This Brand Continues To Develop The Finest Automotive Accessories
- Model Number : 104361-UNIT
- Heavy duty
- High performance
- Stands up to high temperatures
- SATISFIES REQUIREMENTS - for gear oil viscosity of SAE 75W80, 75W, 80W and 85W, as well as SAE 30 and SAE 10W30 motor oil
- APPLICATIONS - include differential oil, final drive oil, gear oil and transfer case fluid, this product is not designed for use in most manual transmissions or transaxles with synchronizers, as extreme slipperiness may cause shifting problems
- CONTAINS - additional friction modifiers for suitability with clutch-type limited slip differentials - for most LSDs, no additional friction modifiers are required, known formerly as LightWeight Gear Oil
- POPULAR GEAR OIL FOR - in many late model BMW, Dodge, Ford, GM, Jeep, Lexus, Mercedes-Benz, Ram, Toyota, also popular in many Formula racing transaxles, including Hewland LD-200 and FTR sequential
- WHY RED LINE - Established in 1979, Red Line Products perform & protect better than any on the market. No compromises
- Formulated to maintain excellent low temperature fluid protection
- Helps provide outstanding thermal stability for cleanliness and longer service life
- Contains special additives to assist in protecting gear teeth from rust and corrosion and reduce chattering in limited-slip differentials
- Recommended for conventional and limited slip differentials and non-synchronized manual transmissions where API GL-5 or API GL-4 fluid is specificed
- Two quarts of SAE 75W-85 Synthetic Axle Lubricant.
- Fit type: Vehicle Specific
- Affordable solutions
- Replaces OEM number: Lucas Oil: 10047
- Excellent for use in limited-slip differentials
- Packaging May Vary
- For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.
SEOCONTENT-START
Warranty Status: Eligible under provisions of New Vehicle Limited Warranty (NVLW)/Service Part Warranty (SPW)/Special Service Part (SSP)/Extended Service Plan (ESP) coverage. Limits/policies/prior approvals are not altered by a TSB. NVLW/SPW/SSP/ESP coverage limits are determined by the identified causal part and verified using the OASIS part coverage tool. Labor Times Description Operation No. Time 2020 Mustang Shelby GT350, 2020-2021 Mustang Mach 1/Shelby GT500: Inspect And Replace The Cooler Line Fittings On The Rear Axle Includes Time To Check And Adjust Differential Fluid (Do Not Use With Any Other Labor Operations) 212330A 0.6 Hrs. Repair/Claim Coding Causal Part: 6K741 Condition Code: D8
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