2020-2023 Ford 10R80 Harsh/Delayed Shift TSB 26-2431

Owners of 2020-2023 Ford and Lincoln vehicles equipped with the 10R80 automatic transmission may experience undesirable shift characteristics, including harsh or delayed engagement and shifting. Ford Technical Service Bulletin (TSB) 26-2431, which supersedes TSB 26-2226, provides a comprehensive diagnostic and repair procedure for these concerns. The bulletin highlights that these issues often stem from problems with the Powertrain Control Module (PCM) software or hydraulic circuit leaks caused by axial movement of the CDF clutch cylinder (7H351) sleeve.

This TSB is particularly relevant for 2020-2023 Ford F-150, Explorer, Expedition, Mustang, Transit, and Lincoln Navigator models. The repair process involves using the Ford Diagnosis and Repair System (FDRS) to perform a C clutch data anomaly detection test, followed by PCM reprogramming and, if necessary, the replacement of the CDF clutch cylinder and associated components. This addresses the common concern of a Ford 10R80 harsh shift.

Symptoms

Owners may notice one or more of the following transmission-related symptoms, indicating a potential issue with the 10R80 transmission:

• Harsh engagement
• Delayed engagement
• Harsh shift
• Delayed shift

These symptoms can significantly impact driving comfort and the overall performance of your vehicle. If you experience any of these, it's important to have your vehicle inspected for a potential Ford 10R80 harsh shift.

Fault Codes / DTCs

When the PCM or Transmission Control Module (TCM) detects a problem, it may illuminate the Malfunction Indicator Lamp (MIL) and store specific Diagnostic Trouble Codes (DTCs). The following DTCs are associated with the 10R80 transmission harsh shift or engagement issues addressed by TSB 26-2431:

• P0751, P0752, P0756, P0757, P0761, P0762, P0766, P0767, P0771, P0772
• P2700, P2701, P2702, P2703, P2704, P2705, P2707, P2708
• P0729, P0731, P0732, P0733, P0734, P0735, P0736
• P076F, P07D9, P07F6, P07F7

These codes indicate various clutch or solenoid performance issues within the transmission, directly correlating with the experienced harsh or delayed shifting.

Diagnosis / Trigger Conditions

Diagnosing the Ford 10R80 harsh shift or engagement problem involves a multi-step process using specialized tools and procedures. The primary diagnostic step is to perform the C Clutch Data Anomaly Detection test using the Ford Diagnosis and Repair System (FDRS) scan tool. This test is crucial for identifying the underlying cause of the transmission concern.

Technicians must ensure they are using the latest software level of FDRS. Before running the C Clutch Data Anomaly Detection test, it's important to note that clearing Keep Alive Memory (KAM), DTCs, and/or transmission adaptive tables will cause the test to abort. The test helps determine if the issue is related to PCM software or requires internal transmission service, such as CDF clutch cylinder replacement.

If the FDRS test passes, the PCM will be reprogrammed. If it fails, further internal transmission inspection and repair are necessary. The diagnostic process also involves checking for harsh/delayed engagement or shift symptoms when the transmission fluid temperature (TFT) is at or below 49°C (121°F).

For situations where a Pressure Vacuum Transducer (PVT) kit is not available (as the Rotunda 164-R9833 and VCMM Transmission Extension Kit Rotunda 164-R9534 are no longer supplied), technicians can use a suitable transmission fluid pressure gauge that measures at least 300 PSI (2,000 kPa) with vibration dampening. This alternative method allows for reliable pressure testing to identify hydraulic circuit leaks.

Important Warnings for Owners

Ford TSB 26-2431 includes several critical advisories that owners should be aware of:

• Post-Repair Shift Quality: "Advise the customer that this vehicle is equipped with an adaptive transmission shift strategy which allows the vehicle's computer to learn the transmission's unique parameters and improve shift quality. When the adaptive strategy is reset, the computer will begin a relearning process. This relearning process may result in firmer than normal upshifts and downshifts for several days." Owners should expect this temporary change in shift feel after the repair.
• Additional Repairs: "If internal transmission service is required to address a concern detected with the CDF clutch cylinder following this article, technicians should carefully inspect and replace other transmission components and flush transmission fluid cooler only as necessary to confirm proper function. Add a new line to the repair order to document any additional repairs needed. M-time can be claimed on the additional repair line to cover labor." This ensures that any additional necessary repairs are properly documented and covered under warranty.
• Tool Availability: The Pressure Vacuum Transducer (PVT) Kit (Rotunda 164-R9833) and VCMM Transmission Extension Kit (Rotunda 164-R9534) are no longer included with the VCMM Advanced Kit (Rotunda 164-R9823) since July 2023 and have been sold out. Ford has confirmed that a high percentage of dealers have this equipment, but alternative pressure gauges and procedures are available.

Repair Procedure Summary

The repair for the Ford 10R80 harsh shift or delayed engagement issue, as outlined in TSB 26-2431, involves a detailed sequence of steps:

1. PCM Reprogramming: If the FDRS C Clutch Data Anomaly Detection test passes, the Powertrain Control Module (PCM) is reprogrammed to the latest software level using FDRS. This addresses software-related causes of the 10R80 harsh shift.
2. Adaptive Learning Drive Cycle: After PCM reprogramming, an adaptive learning drive cycle is performed. This allows the transmission's computer to re-learn its unique parameters and optimize shift quality. Owners should be advised that initial shifts might feel firmer than normal during this relearning period.
3. Transmission Removal and Disassembly (if needed): If the FDRS test fails or if symptoms persist after reprogramming and adaptive learning, the transmission is removed from the vehicle and mounted on a bench for disassembly. This allows access to internal components.
4. Clutch and Planetary Assembly Disassembly: The clutch and planetary assembly is carefully disassembled. The focus is on removing the CDF clutch cylinder (7H351) and the planetary container cylinder.
5. Component Inspection and Replacement: The CDF clutch cylinder (7H351) is a key component to be replaced. Technicians will also replace various seals, including sun gear shaft seals, input shaft seals, and other associated seals and gaskets. Other components within the clutch and planetary assembly are inspected and replaced only if necessary.
6. Reassembly: The clutch and planetary assembly is reassembled with the new CDF clutch cylinder and seals. This includes performing clutch clearance measurements and setting the T3 thrust bearing measurement.
7. Transmission Reinstallation: The transmission is reassembled and reinstalled in the vehicle.
8. Final Adaptive Learning Drive Cycle: A final adaptive learning drive cycle is performed to ensure the transmission adapts correctly to the new components and software.

This comprehensive procedure aims to resolve the underlying mechanical and software issues contributing to the Ford 10R80 harsh shift and engagement concerns.

Required Tools or Parts

To perform the diagnosis and repair outlined in TSB 26-2431, technicians require specific tools and parts:

• Ford Diagnosis and Repair System (FDRS): Essential for running the C Clutch Data Anomaly Detection test and PCM reprogramming.
• Pressure Vacuum Transducer (PVT) Kit: While the Rotunda 164-R9833 and VCMM Transmission Extension Kit (Rotunda 164-R9534) are no longer supplied, a VCMM Universal Probe Tip Adapter (Rotunda 164-R9834, or equivalent) is needed. Alternatively, suitable transmission fluid pressure gauges are used.
• CDF Clutch Cylinder (7H351): This is a primary replacement part. Different part numbers exist based on the engine and model (e.g., JL3Z-7H351-B for 5.0L Mustang, Transit, 3.0L Explorer; JR3Z-7H351-B for 3.3L Explorer, 2.3L Mustang; ML3Z-7H351-B for F-150/Expedition/Navigator).
• Clutch and Planetary Container Cylinder: Part number PC3Z-7B177-A.
• Various Seals and Gaskets: Including auxiliary pump tube seal (HL3Z-7G199-A), torque converter seal (HL3Z-7A248-A), front support bolts (JL3Z-7N134-AA), front support bolt seals (LC3Z-7H223-AA), input shaft seals (HL3Z-7G091-F), sun gear shaft seals (HL3Z-7B399-C), and numerous selective clutch snap rings and apply plates.
• Transmission Fluids and Lubricants: Motorcraft MERCON® LV Automatic Transmission Fluid (XT-10-QLVC, CXT-10-LV6, XT-12-QULV), Motorcraft Yellow Prediluted Antifreeze/Coolant (VC-13DL-G, CVC-13DL-G), Motorcraft Premium Long-Life Grease (XG-1-E1), Motorcraft Multi-Purpose Grease Spray (XL-5-A), and Motorcraft Thread Sealant With PTFE (TA-24-B).

These specialized items ensure that the repair is performed correctly and effectively addresses the Ford 10R80 harsh shift condition.

Owner Action

If you own a 2020-2023 Ford or Lincoln vehicle with a 10R80 transmission and are experiencing harsh or delayed shifting, it is recommended to schedule an appointment with your dealership. Explain the symptoms you are observing, such as a harsh engagement or a delayed shift, and mention any illuminated warning lights or DTCs if you have them. The dealership technicians will use TSB 26-2431 to diagnose and repair the issue. Since this is a technical service bulletin, the repair is typically covered under warranty if your vehicle meets the specified conditions.

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Source: NHTSA ID: 11038712