# Service bulletin TSB 21\-2064

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10189781
- Published by NHTSA: 2021\-04\-03
- Manufacturer's number: TSB 21\-2064
- Manufacturer's date: 2021\-03\-10
- NHTSA component: POWER TRAIN

## NHTSA's summary

Some 2015\-2021 Transit vehicles equipped with rear wheel drive \(RWD\), single rear wheel \(SRW\), and a U\-joint at the transmission flange and rear driveshaft may experience a boom/hum/moan noise or vibration from the rear while driving. This noise or vibration is most prevalent at highway speeds \(112\-121 km/h 7075 mph for 4.10 axle ratio, 121\-128 km/h 75\-80 mph for 3.73 axle ratio, and 136\-145 km/h 85\-90 mph for 3.31 axle ratio\) and may also be present to a lesser degree at roughly half of those speeds. This may be due to a 2nd order driveline frequency transmitted through the rear drive shaft, rear axle and into the body through the leaf springs. To correct the condition, follow the Service Procedure to install a driveshaft torsional damper.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10189781-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10189781-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Transmission and driveline

## Vehicles listed

- 2015 to 2021 FORD TRANSIT

## Recalls for the same vehicles and component

- [2021774](/recalls/tc/2021774.md), 2021-12-17: Powertrain
- [21V978000](/recalls/nhtsa/21V978000.md), 2021-12-16: POWER TRAIN:DRIVELINE:DRIVESHAFT
- [2019538](/recalls/tc/2019538.md), 2019-10-25: Powertrain
- [19V767000](/recalls/nhtsa/19V767000.md), 2019-10-25: POWER TRAIN:DRIVELINE:DRIVESHAFT
- [19V103000](/recalls/nhtsa/19V103000.md), 2019-02-21: POWER TRAIN:DRIVELINE:DRIVESHAFT; POWER TRAIN:DRIVELINE:UNIVERSAL JOINT
- [2017320](/recalls/tc/2017320.md), 2017-06-27: Powertrain
- [17V408000](/recalls/nhtsa/17V408000.md), 2017-06-26: POWER TRAIN:DRIVELINE:DRIVESHAFT
- [15V865000](/recalls/nhtsa/15V865000.md), 2015-12-22: POWER TRAIN:AXLE ASSEMBLY:AXLE SHAFT
- [2015608](/recalls/tc/2015608.md), 2015-12-21: Powertrain

## Other bulletins for the same vehicles and component

- [SSM 55098](/bulletins/11036338.md), 2026-08-25, Service bulletin: UNKNOWN OR OTHER; POWER TRAIN; ENGINE. Some 2013\-2016 Super Duty vehicles equipped with a 6.7L diesel engine and 2015\-2019 Transit vehicles equipped with a 3.2L diesel engine may not pass a state smog test due to the exhaust gas system \(EGS\) monitor that will not run after completing the exhaust gas sensor drive cycle located within Section 2 of the Powertrain Control/Emissions Diagnostics \(PC/ED\) Manual \> Drive Cycles. This may be due to the vehicles diesel oxidation catalyst \(DOC\) age counter being under the 120\-minute age requirement. There is an all\-new "PCM Catalytic Converter Age Evaluation" application within the latest version of the Ford Diagnosis and Repair System \(FDRS\). Use this new FDRS application to determine the age \(in minutes\) of the DOC. If the age is less than 120 minutes, perform manual regenerations to increase the catalyst age counter to satisfy the monitor age requirement. If further assistance is needed, contact the technical assistance center \(TAC\). Note: this article only applies to the EGS monitor. Problems with other vehicle monitors not running successfully must be addressed using normal diagnostics located i
- [TSB 26\-2226](/bulletins/11032697.md), 2026-05-14, Service bulletin: POWER TRAIN. This bulletin supersedes 26\-2046. Reason For Update: update the parts list to change the claim quantity of the C clutch friction plates \(HL3Z\-7B164\-A\), C clutch steel plates \(HL3Z\-7B442\-F\), D clutch steel plates \(HL3Z\-7B442\-D\), add the rear driveshaft flange CV joint\-to\-pinion flange cup bolts and retaining straps \(LK4Z\-4B496\-B\) for Transit, and update the parts description for the transfer case fluids applicable for each vehicle line. Some of the vehicles listed in the Model statement above may exhibit all of the following conditions: \* Harsh engagement \* Delayed engagement \* Harsh shift \* Delayed shift \* Illuminated malfunction indicator lamp \(MIL\) with diagnostic trouble codes \(DTC\) 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 and/or P07F7 stored in the powertrain control module \(PCM\) or transmission control module \(TCM\). This may be due to PCM software and/or axial movement of the CDF clutch cylinder \(7H351\) sleeve causing hydraulic circuit
- [25N12](/bulletins/11031778.md), 2026-04-30, Other: POWER TRAIN. Customer Satisfaction Program 25N12 Certain 2020\-2025 Model Year Transit All\-Wheel\-Drive \(AWD\) Vehicles Transfer Case Replacement If Required After Dealer Evaluation
- [SSM 54719](/bulletins/11031262.md), 2026-04-10, Service bulletin: POWER TRAIN. For 20212026 vehicles equipped with the 10R80 transmission, a new Transmission Clutch Circuit Leak Test has been introduced in the Ford Diagnosis and Repair System \(FDRS\). This test utilizes the pressure and vacuum transducer \(PVT\) when available. When referred to a specific clutch \(A\-F\) test by a pinpoint test in Workshop Manual \(WSM\), Section 307\-01 \> Diagnosis and Testing, the Clutch Assembly tests have been updated with a hyperlink to the new Transmission Line Pressure Test \- Pressure Vacuum Transducer \(PVT\) Is Available procedure in WSM, Section 307\-01 \> General Procedures. This procedure provides instructions to perform the FDRS Transmission Clutch Circuit Leak Test when applicable. The new test improves the accuracy of detecting leaks within transmission fluid circuits and replaces the previous air check method. The previous air check procedure has been shown to produce a high rate of false positives, which may lead to unnecessary repairs when no actual leak is present. Accordingly, the air check procedure is not to be used for diagnosing internal transmission hydraulic leaks or as justification
- [SSM 54674](/bulletins/11030791.md), 2026-04-06, Service bulletin: POWER TRAIN. For 2021\-2026 vehicles equipped with the 10R80 transmission, a new Transmission Clutch Circuit Leak Test has been introduced in the Ford Diagnosis and Repair System \(FDRS\). This test utilizes the pressure and vacuum transducer \(PVT\) when available. The Workshop Manual \(WSM\) has been updated under Section 307\-01 \> Diagnosis and Testing to include this procedure. The new test improves the accuracy of detecting leaks within transmission fluid circuits and replaces the previous air check method.
- [SSM 54592](/bulletins/11029081.md), 2026-02-27, Service bulletin: POWER TRAIN. For 20172026 vehicles equipped with a 10R transmission, a revision to the Road Testing Vehicle procedure has been made in the WSM, located in Section 307\-01 \> Diagnosis and Testing. This updated procedure improves the diagnosis of customer reported transmission concerns and aids in locating the proper root cause. During diagnosis and testing, details regarding whether the condition is more prevalent when the vehicle is hot or cold, throttle percentage at the time of occurrence, vehicle speed, the specific shift involved, and whether the issue occurs during transmission engagements \(N\>R, N\>D, R\>D, or D\>R\) should be noted. Engineering requests including these detailed operating conditions that will significantly assist with root cause analysis. Diagnosis, testing, and repair should use established labor times outside this article.
- [TSB 26\-2046](/bulletins/11028832.md), 2026-02-17, Service bulletin: POWER TRAIN. This bulletin supersedes TSB 25\-2611. Reason For Update: Change the part number for the transmission fluid heat exchanger bolt \(Expedition/Navigator\) as well as change the claim/package quantities for HL3Z\-7B442\-F and HL3Z\-7B164\-C. Some of the vehicles listed in the Model statement above may exhibit at least one of the following conditions: \* Harsh engagement \* Delayed engagement \* Harsh shift \* Delayed shift \* Illuminated malfunction indicator lamp \(MIL\) with diagnostic trouble codes \(DTC\) 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 and/or P07F7 stored in the powertrain control module \(PCM\) or transmission control module \(TCM\). This may be due to PCM software and/or axial movement of the CDF clutch cylinder \(7H351\) sleeve causing hydraulic circuit leaks.
- [TSB 25\-2611](/bulletins/11027124.md), 2026-01-06, Service bulletin: POWER TRAIN. This bulletin supersedes TSB 25\-2474 for 3 Part List corrections. Some of the vehicles listed in the Model statement above may exhibit at least one of the following conditions: \* Harsh engagement \* Delayed engagement \* Harsh shift \* Delayed shift \* Illuminated malfunction indicator lamp \(MIL\) with diagnostic trouble codes \(DTC\) 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 and/or P07F7 stored in the powertrain control module \(PCM\) or transmission control module \(TCM\). This may be due to PCM software and/or axial movement of the CDF clutch cylinder \(7H351\) sleeve causing hydraulic circuit leaks. NOTE: 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
- [25B47 S1](/bulletins/11026876.md), 2026-01-01, Other: POWER TRAIN; UNKNOWN OR OTHER; STRUCTURE:BODY. Certain 2021\-2024 Model Year Transit All\-Wheel\-Drive \(AWD\) Vehicles Transfer Case Replacement
- [SSM 54366](/bulletins/11025611.md), 2025-11-19, Service bulletin: POWER TRAIN; ELECTRICAL SYSTEM. Some 2015\-2021 Ford and Lincoln vehicles may exhibit an illuminated MIL with diagnostic trouble codes \(DTCs\) P0011, P0012, P0014, P0015, P0016, P0017, P0018, P0019, P0021, P0022, P0024 and/or P0025. Pinpoint test HK in the Powertrain Control and Emissions Diagnosis \(PC/ED\) or in Section 303\-14 of the Workshop Manual \(WSM\) has been updated to address this concern.

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