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NHTSA ID Number: 10201063
Manufacturer Communication Number: TSB 21-2148
Summary
Some 2020-2021 Mustang
GT500 vehicles may exhibit a transmission fluid leak caused by improperly seated or cracked transmission cooler tubes attached to the transmission case. This may be due to the retaining bolts being cross threaded causing the seals to leak and/or crack the lines. If the threads in the transmission case that the cooler tube retaining bolts go into are damaged, it is not necessary to replace the transmission. These threads can be repaired. To correct the condition, follow the Service Procedure to repair these threads and replace the tubes.
Mustang Shelby GT500
This bulletin supersedes 21-2108. Reason for update: New Part/Procedure For Same Condition
2020-2021 Mustang GT 500
Summary
This article supersedes TSB 21-2108 to update the issue, action, and Service Procedure.
Issue: Some 2020-2021 Mustang GT500 vehicles may exhibit a transmission fluid leak caused by improperly seated or cracked transmission cooler tubes attached to the transmission case. This may be due to the retaining bolts being cross threaded causing the seals to leak and/or crack the lines. If the threads in the transmission case that the cooler tube retaining bolts go into are damaged, it is not necessary to replace the transmission. These threads can be repaired. To correct the condition, follow the Service Procedure to repair these threads and replace the tubes.
Action: Follow the Service Procedure steps to correct the condition on vehicles that meet all of the following criteria:
- 2020-2021 Mustang GT500
- Transmission fluid leak caused by improperly seated or cracked transmission cooler tubes with damaged cooler tube retaining bolt threads in the transmission
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. “If Needed” indicates the part is not mandatory.
Parts
| Service Part Number | Quantity | Description | |
| KR3Z-7C013-A | 1 | Transmission Fluid Filter Housing Cover | – |
| KR3Z-7R081-C | 1 | Transmission Fluid Cooler Tube | – |
| Obtain Locally | 1 | Thread Repair Kit | – |
| XT-14-L | As Needed | Motorcraft® Dual Clutch Transmission Fluid | – |
| Parts To Inspect And Replace Only If Necessary | |||
| W721914-S450 | If Needed | Transmission Fluid Cooler Tube Retaining Bolt | Package Contains 4 Pieces |
5L7Z-7D285-A  | If Needed | Backing Ring | Package Contains 2 Pieces |
| 5L7Z-7J324-A | If Needed | Band Seal | Package Contains 2 Pieces |
| KR3Z-7C045-B | If Needed | Transmission Oil Filter Kit | – |
Service Procedure
1. Determine which fluid cooler tube port on the transmission has damaged threads.
(1). If the front port is damaged, replace the transmission fluid filter cover. Refer to Workshop Manual (WSM), Section 307-01B. Proceed to Step 2.
(2). If the rear port is damaged, proceed to Step 2.
2. Remove and discard the transmission fluid cooler tubes. Refer to WSM, Section 307-02B, Removal and Installation, Transmission Fluid Cooler Tubes, Steps 1,2,3,4,8,9,10,11.
3. Cover the fluid cooler tube ports in the side of the transmission to prevent any debris from entering the transmission.
4. Using a M6 x 1 x 12mm thread repair insert kit, repair the damaged threads in the transmission case. Use the instructions contained with the kit to install the thread repair kit.
5. Thoroughly clean the repair area.
6. Install the new rear transmission fluid cooler tubes. Refer to WSM, Section 307-02B. Replace the rear transmission fluid cooler tube retaining bolt(s) as necessary.
7. Verify the proper transmission fluid level. Add fluid as necessary.
8. Make sure no leaks are present after making the repair. If any leaks are found, refer to WSM, Section 307-01B.
2 Affected Products
Vehicle
1 Associated Document
Manufacturer Communications
21-2148
30 August 2021
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NHTSA ID Number: 10191174
Manufacturer Communication Number: TSB 21-2108
Summary
Some 2020-2021 Mustang GT500 vehicles may exhibit a transmission fluid leak caused by improperly seated transmission cooler tubes attached to the transmission case. If the threads in the transmission case that the cooler tube retaining bolts go into are damaged, it is not necessary to replace the transmission. These threads can be repaired. To correct the condition, follow the Service Procedure to repair these threads.
1 Associated Document
Manufacturer Communications
21-2108
09 April 2021
MC-10191174-0001.pdf 105.663KB
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- Specifically formulated for use in the DPS6 power shift twin dry-clutch transmission
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- Approved First Fill and Service Fill FFL-2 transmission fluid
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- Kit includes all necessary parts for a complete transmission service
- Do not mix with other gear oils
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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 2020-2021 Mustang GT500: Inspect And Replace The Transmission Fluid Filter Cover And Fluid Cooler Tubes, Includes Time To Adjust Transmission Fluid Level, Front Port Only (Do Not Use With Any Other Labor Operations) 212148A 1.4 Hrs. 2020-2021 Mustang GT500: Inspect And Repair The Threads On The Rear Port And Replace The Fluid Cooler Tubes, Includes Time To Adjust Transmission Fluid Level, Rear Port Only (Do Not Use With Any Other Labor Operations) 212148B 1.4 Hrs. 2020-2021 Mustang GT500: Inspect And Repair The Threads On The Rear Port, Replace The Transmission Fluid Filter Cover And Replace The Fluid Cooler Tubes, Includes Time To Adjust Transmission Fluid Level (Do Not Use With Any Other Labor Operations) 212148C 1.6 Hrs. Repair/Claim Coding Causal Part: 7003 Condition Code: 24
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SEOCONTENT-END
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