TECHNICAL SERVICE BULLETIN
Front End Noise (Clink/Clunk)
Front Differential Mount Frame Bracket
Cracked Or Broken
2021-2024 Bronco Front End Noise Front Differential Mount Frame Bracket
24-2408
09 December
2024
Model:
| Ford 2021-2024 Bronco |
Engine: 2.3L Engine: 2.7L |
Markets: North American markets only
Issue: Some 2021-2024 Bronco vehicles equipped with a 2.3L/2.7L engine may exhibit a loud front end clink/clunk noise that leads to the identification of a cracked or broken front differential frame mount bracket. This may be due to flexing of the front differential from driving in 4L for extended periods of time. To correct this concern, repair the mounting bracket using the frame bracket repair kit and update the AWD module to the latest level of software using the latest software version of the FDRS scan tool.
NOTE: Advise the customer that 4L/Rock Crawl drive mode should only be used when necessary, as using 4L when not necessary can cause damage to the vehicle. Refer to the Owner’s Manual for additional information.
Action: Follow the Service Procedure to correct the condition on vehicles that meet all of the following criteria:
- 2021-2024 Bronco
- 2.3L or 2.7L engine
- One of the following symptoms:
– Clink/clunk noise from the front end
– Cracked or broken front differential frame mount bracket
Parts
| Service Part Number | Claim Quantity | Package Order Quantity | Number in Package | Description |
| NB3Z-3D171-P | 1 | 1 | 1 | Frame Bracket Repair Kit |
| W720940-S440 | 2 | 1 | 4 | Stabilizer Bar Link Nut |
| W719869-S439 | 4 | 1 | 4 | Stabilizer Bar Undershield Bolt |
| W721449-S439 | 2 | 1 | 4 | Stabilizer Bar Bolt |
| W520214-S440 | 2 | 1 | 2 | Stabilizer Bar Nut |
| W721041-S439 | 2 | 1 | 4 | Stabilizer Bar Stud |
| JB3Z-4B496-B | 6 | 1 | 6 | Cup Bolt And Retaining Straps |
| KB3Z-3B477-B | 2 | 1 | 2 | Axle Nut (Vehicles Built On Or After 23- Aug-2023) |
| KB3Z-3B477-A | 2 | 1 | 2 | Axle Nut (Vehicles Built On Or Before 22-Aug-2023) |
| W717938-S439 | 4 | 1 | 4 | Caliper Bracket Bolts |
| W719491-S439 | 8 | 2 | 4 | Hub Bolts (Vehicles Built On Or Before 16-May-2022) |
| W720861-S439 | 8 | 2 | 4 | Hub Bolts (Vehicles Built On Or After 17-May-2022 |
| W716883-S440 | 2 | 2 | 1 | Tie Rod Nut |
| W720110-S440 | 2 | 1 | 4 | Upper Ball Joint Nut |
| JB3Z-3B498-A | 2 | 2 | 1 | CV Shaft Retainer |
| W720110-S440 | 2 | 1 | 4 | Lower Ball Joint Nut |
| E8UZ-4N282-A | 1 | 1 | 1 | Drain Plug |
| W500590-S439 | 1 | 1 | 1 | Front Axle Mount Bolt |
| W716126-S442 | 1 | 1 | 1 | Axle Extension Bolt And Washer Assembly |
| KB3Z-7A443-A | 1 | 1 | 1 | Front Axle Mount Bolt |
| W717969-S440 | 2 | 1 | 2 | Ball Joint Nut |
| W717376-S439B | 6 | 2 | 4 | Shield Bolt |
Parts – Parts To Inspect And Replace Only If Necessary
| Service Part Number | Claim Quantity | Package Order Quantity | Number in Package | Description |
| MB3Z-5482-B | Only If Necessary (1 Possible) | Only If Necessary | 1 | Stabilizer Bar |
| MB3Z-5484-A | Only If Necessary (2 Possible) | Only If Necessary | 1 | Stabilizer Bar Bushing |
| MB3Z-4B416- A | Only If Necessary (2 Possible) | Only If Necessary | 1 | Axle Seal |
| YL8Z-4B413- AA | Only If Necessary (1 Possible) | Only If Necessary | 1 | Thrust Bearing |
| XY-75W85-QL | Only If Necessary | Only If Necessary | Motorcraft® SAE 75W-85 Premium Synthetic Hypoid Gear Lubricant |
Claim Quantity refers to the total number of individual pieces required to repair the vehicle.
Package Order Quantity refers to the amount of the service part number package(s) required to repair the vehicle.
Number In Package refers to the number of individual pieces included in a service part number package.
Only If Necessary indicates the part is not mandatory. Refer to the Service Procedure to determine the inspection/inclusion criteria.
Warranty Status: Eligible under provisions of New Vehicle Limited Warranty (NVLW)/Service Part Warranty (SPW)/Service Part New Vehicle (SPNV)/Extended Service Plan (ESP) coverage. Limits/policies/prior approvals are not altered by a TSB. NVLW/SPW/SPNV/ESP coverage limits are determined by the identified causal part and verified using the OASIS part coverage tool.
Labor Times
| Description | Operation No. | Time |
| 2021-2024 Bronco: Inspect (PASS), Program The AWD Module, Includes Road Test (Do Not Use With Any Other Labor Operations) | 242408A | 0.6 Hrs. |
| 2021-2024 Bronco Equipped Without Part Time Engagement: Inspect (FAIL), Repair The Differential Mount Bracket Following The Service Kit Instructions, Program The AWD Module, Includes Road Test (Can Be Claimed With Operation F Or G) (Do Not Use With Any Other Labor Operations Outside Of This Article) | 242408B | 5.5 Hrs. |
| 2021-2024 Bronco Equipped Without Part Time Engagement And With Sway Bar Disconnect: Inspect (FAIL), Repair The Differential Mount Bracket Following The Service Kit Instructions, Program The AWD Module, Includes Road Test (Can Be Claimed With Operation F Or G) (Do Not Use With Any Other Labor Operations Outside Of This Article) | 242408C | 6.1 Hrs. |
| 2021-2024 Bronco Equipped With Part Time Engagement: Inspect (FAIL), Repair The Differential Mount Bracket Following The Service Kit Instructions, Program The AWD Module, Includes Road Test (Can Be Claimed With Operation F Or G) (Do Not Use With Any Other Labor Operations Outside Of This Article) | 242408D | 5.6 Hrs. |
| 2021-2024 Bronco Equipped With Part Time Engagement And With Sway Bar Disconnect: Inspect (FAIL), Repair The Differential Mount Bracket Following The Service Kit Instructions, Program The AWD Module, Includes Road Test (Can Be Claimed With Operation F Or G) (Do Not Use With Any Other Labor Operations Outside Of This Article) | 242408E | 6.2 Hrs. |
| Additional Time To Adjust Front Camber And Front Toe (Can Be Claimed With Operation B, C, D Or E) | 242408F | 1.1 Hrs. |
| Additional Time To Adjust Front Camber And Front Toe Equipped With Lane Departure (Can Be Claimed With Operation B, C, D Or E) | 242408G | 1.2 Hrs. |
Repair/Claim Coding
| Causal Part: | 3D171 |
| Condition Code: | 01 |
Service Procedure
- Using a mirror, inspect the front differential frame mount bracket (Figure 1). Is the front differential frame mount bracket cracked similar to Figure 2?
Figure 2
(1). Yes – proceed to Step 2.
(2). No – proceed to Step 3. - Repair the front differential frame mount bracket using the frame bracket repair kit. Refer to the installation instruction sheet included with the frame bracket repair kit.
- Update the AWD module to the latest software level using the latest software version of the FDRS scan tool.
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All rights reserved.
NOTE: The information in Technical Service Bulletins is intended for use by trained, professional technicians with the knowledge, tools, and equipment to do the job properly and safely. It informs these technicians of conditions that may occur on some vehicles, or provides information that could assist in proper vehicle service. The procedures should not be performed by “do-it-yourselfers”. Do not assume that a condition described affects your car or truck. Contact a Ford or Lincoln dealership to determine whether the Bulletin applies to your vehicle. Warranty Policy
and Extended Service Plan documentation determine Warranty and/or Extended Service Plan coverage unless stated otherwise in the TSB article. The information in this Technical Service Bulletin (TSB) was current at the time of printing. Ford Motor Company reserves the right to supersede this information with updates. The most recent information is available through Ford Motor Company’s on-line technical resources.
https://www.fordtechservice.dealerconnection.com
Documents / Resources
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Bronco6G 2021-2024 Bronco Front End Noise Front Differential Mount Frame Bracket [pdf] Installation Guide 2021-2024 Bronco Front End Noise Front Differential Mount Frame Bracket, 2021-2024, Bronco Front End Noise Front Differential Mount Frame Bracket, Front End Noise Front Differential Mount Frame Bracket, Noise Front Differential Mount Frame Bracket, Differential Mount Frame Bracket, Mount Frame Bracket, Frame Bracket, Bracket |