NHTSA ID Number: 10248362
Manufacturer Communication Number: TSB 23-2409
Summary
This article supersedes TSB 23-2219 to update the Parts List. Some 2021-2023 Bronco vehicles may exhibit no 3rd gear engagement and/or a grinding noise going into 3rd and/or 4th gear. This may be due to the transmission shifting system and clutch interaction such as a lack of full clutch disengagement during shifts and/or placing weight upon the gear shift lever while driving. To correct this condition, follow the Service Procedure to replace the 3rd and/or 4th gears and/or synchronizers as needed.
This bulletin supersedes 23-2219. Reason for update: Incorrect or Missing Parts
Model:
Ford
2021-2023 Bronco | Transmission: MT88 Manual Transmission |
Summary
This article supersedes TSB 23-2219 to update the Parts List.
Issue: Some 2021-2023 Bronco vehicles may exhibit no 3rd gear engagement and/or a grinding noise going into 3rd and/or 4th gear. This may be due to the transmission shifting system and clutch interaction such as a lack of full clutch disengagement during shifts and/or placing weight upon the gear shift lever while driving. To correct the condition, follow the Service Procedure to replace the 3rd and/or 4th gears and/or synchronizers as needed.
Action: Follow the Service Procedure to correct the condition if the vehicle meets the following criteria:
- 2021-2023 Bronco
- Equipped with MT88 manual transmission
- At least one of the following:
- Grinding noise going into 3rd and/or 4th gear
- Will not go into 3rd gear
Parts
| Service Part Number | Quantity | Description | Unit of Issue | Piece Quantity | Note |
| MU7Z-7M157-A | 1 | Synchronizer Ring Plate | 1 | 1 | |
| MU7Z-7101-A | 1 | 3rd Gear And Cone Assembly | 1 | 1 | |
| MU7Z-7107-B | 2 | Synchronizer Ring | 1 | 1 | |
| MU7Z-7W441-A | 1 | Gear Shift Lever Pin | 1 | 1 | |
| MU7Z-7048-A | 1 | Input Shaft Seal | 1 | 1 | |
| BR3Z-7052-A | 1 | Rear Oil Seal | 1 | 1 | |
| JB3Z-4B496-B | 6 | Front Driveshaft Bolts And Retaining Straps | 1 | 6 | |
| LB3Z-4B496-A | 8 | Rear Driveshaft Bolts And Retaining Straps | 1 | 8 | |
| MU7Z- 7124-C | 1 | Synchronizer Hub | 1 | 1 | |
| W710624-S300 | 1 | Roll Pin Reverse/Crawl Shift Fork | 1 | 1 | |
| W500121-S439 | 4 | Transfer Case Bolts | 4 | 1 | |
| W520103-S442 | 4 | Exhaust Flange Nut | 4 | 1 | |
| MB3Z-9450-B | 1 | Exhaust Manifold Gasket | 1 | 1 | |
| MU7Z-7P497-A | 1 | Counter Shaft Bore Plug | 1 | 1 | This may be called Compression Ring |
| BR3Z-7064-A | 1 | Input Shaft Snap-Ring | 1 | 1 | |
| MU7Z-3K050-B | 2 | 6th Gear Snap-Ring | 1 | 2 | |
| MU7Z-3K050-A | 2 | Reverse/Crawl Gear Snap-Ring | 1 | 1 | |
| MU7Z-3K050-C | 1 | 4th Gear Snap-Ring | 1 | 1 | |
| ZC-20 | As Needed | Motorcraft® Engine Shampoo and Degreaser | 1 | As Needed | |
| TA-357 | As Needed | Motorcraft® High Performance Engine RTV Silicone | 1 | As Needed | |
| XT-11-QDC | As Needed | Dual Clutch Transmission Fluid | 1 | As Needed | |
| PM-4-A | As Needed | Motorcraft® Metal Brake Parts Cleaner | 1 | As Needed | |
| ZC-31-B | As Needed | Motorcraft® Metal Surface Prep Wipes | 1 | As Needed | |
| PM-20 | As Needed | Motorcraft® DOT 4 LV High Performance Motor Vehicle Brake Fluid | 1 | As Needed | |
| ZC-30-A | As Needed | Motorcraft® Silicone Gasket Remover | 1 | 1 |
Quantity refers to the amount of the service part number required to repair the vehicle.
Unit of Issue refers to the number of individual pieces included in a service part number package.
Piece Quantity refers to the total number of individual pieces required to repair the vehicle.
As Needed indicates the amount of the part may vary and/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 – Parts To Inspect And Replace Only If Necessary
| Service Part Number | Quantity | Description | Unit of Issue | Piece Quantity |
| MU7Z- 7230-A | If Needed | Shift Fork 3rd and 4th Gears | 1 | 1 |
Service Procedure
1. Remove the transmission from the vehicle. Refer to Workshop Manual (WSM), Section 308-03.
2. Disassemble the transmission. Refer to WSM, Section 308-03 > Disassembly > Transmission, Steps 1-34.
3. Remove the output shaft from the transmission case to gain access to the 3rd and 4th gears and synchronizer assemblies. Refer to WSM, Section 308-03 > Disassembly and Assembly of Subassemblies > Input Shaft, Steps 1-5.
4. Replace the following components and any associated damaged parts. Refer to WSM, Section 308-03.
- 3rd gear.
- Synchronizer assemblies for 3rd and 4th gears.
- 4th gear synchronizer ring. (Figure 1)
Figure 1
- Inspect and replace any other damaged parts as needed.
NOTE: 3rd gear is part of the input shaft. The 4th gear assembly is part of the output shaft assembly and does not require replacement, unless damage is found. In this transmission 4th gear uses a synchronizer ring to align the synchronizer assembly with the gear during shifts.
5. Assemble the transmission. Refer to WSM, Section 308-03.
6. Install the transmission. Refer to WSM, Section 308-03.
3 Affected Products
Vehicle
| MAKE | MODEL | YEAR |
| FORD | BRONCO | 2021-2023 |
1 Associated Document
Manufacturer Communications
23-2409
08 December 2023
NHTSA ID Number: 10242848
Manufacturer Communication Number: TSB 23-2219
Summary
Some 2021-2023 Bronco vehicles may exhibit no 3rd gear engagement and/or a grinding noise going into 3rd and/or 4th gear. This may be due to the transmission shifting system and clutch interaction such as a lack of full clutch disengagement during shifts and/or placing weight upon the gear shift lever while driving. To correct this condition, follow the Service Procedure to replace the 3rd and/or 4th gears and/or synchronizers as needed.
1 Associated Document
Manufacturer Communications
23-2219
31 August 2023
- The information below is per-pack only
- Package Weight : 32.2817248764489 pounds
- Provides exceptional drivetrain protection
- Made to provide the perfect lubricant solution for your needs
- Designed with innovative manufacturing techniques
- Package Weight : 32.2817248764489 pounds
- Provides exceptional drivetrain protection
- Made to provide the perfect lubricant solution for your needs
- Designed with innovative manufacturing techniques
- Formulated with premium friction modifiers to ensure smooth shifting performance under variable driving conditions
- Formulated with premium synthetic base oils to minimize thermal breakdown and deposits
- Advanced anti-wear technology to better prevent gear wear
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- Superior Formulation: Full synthetic, PAO / Ester based formulation with extensive testing and performance data - far exceeding OEM performance requirements
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- Exceptional Longevity: Lasts over 300,000 miles and is thus classified as a “fill-for-life” product in properly sealed transmissions unless the OEM specifies otherwise
- Unmatched Shifting Performance: Delivers flawless shifting, eliminates slippage, ensures optimal functionality in all conditions, maintains cold flow down to -60°F, and is compatible with all seal materials, both synthetic and natural rubber
- Outstanding Shifting: Effectively prevents gear scuffing, ensuring smooth operation and enhanced performance even under high torque and horsepower racing conditions
- Meets the challenging demands of dual clutch transmissions
- Enhanced anti-shudder protection for smooth shifting and maximum power transfer while preventing wear of the gears and synchronizers.
- Advanced anti-wear technology improves durability to help extend the life of your transmission
- Provides better oil flow in both low and high temperatures
- Full synthetic formula with advanced additives protects against transmission breakdown better than conventional fluids
Last update on 2026-06-18 / Affiliate links / Images from Amazon Product Advertising API
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TECHNICAL SERVICE BULLETIN
MT88 Manual Transmission – No 3rd Gear And/Or Grinding Noise Going Into 3rd And/Or 4th Gear
23-2409
08 December
2023
This bulletin supersedes 23-2219. Reason for update: Incorrect or Missing Parts
Model: Ford
2021-2023 Bronco Transmission: MT88 Manual Transmission
Summary
This article supersedes TSB 23-2219 to update the Parts List.
Issue: Some 2021-2023 Bronco vehicles may exhibit no 3rd gear engagement and/or a grinding noise going into 3rd and/or 4th gear. This may be due to the transmission shifting system and clutch interaction such as a lack of full clutch disengagement during shifts and/or placing weight upon the gear shift lever while driving. To correct the condition, follow the Service Procedure to replace the 3rd and/or 4th gears and/or synchronizers as needed.
Action: Follow the Service Procedure to correct the condition if the vehicle meets the following criteria:
• 2021-2023 Bronco
• Equipped with MT88 manual transmission
• At least one of the following:
– Grinding noise going into 3rd and/or 4th gear
– Will not go into 3rd gear Parts
Service Part Number Quantity Description Unit of Issue Piece Quantity Note MU7Z-7M157- A
MU7Z-7101-A MU7Z-7107-B
MU7Z-7W441- A
MU7Z-7048-A BR3Z-7052-A JB3Z-4B496-B LB3Z-4B496-A MU7Z- 7124-C
W710624- S300
W500121- S439
W520103- S442
MB3Z-9450-B 1 Synchronizer Ring Plate 1 1
1 3rd Gear And Cone Assembly 1 1
2 Synchronizer Ring 1 1
1 Gear Shift Lever Pin 1 1
1 Input Shaft Seal 1 1
1 Rear Oil Seal 1 1
6 Front Driveshaft Bolts And Retaining 1 6
Straps
8 Rear Driveshaft Bolts And Retaining 1 8
Straps
1 Synchronizer Hub 1 1
1 Roll Pin Reverse/Crawl Shift Fork 1 1
4 Transfer Case Bolts 4 1
4 Exhaust Flange Nut 4 1
1 Exhaust Manifold Gasket 1 1 MU7Z-7P497- A
BR3Z-7064-A
MU7Z-3K050- B
MU7Z-3K050- A
MU7Z-3K050- C
ZC-20 TA-357
XT-11-QDC PM-4-A ZC-31-B PM-20 ZC-30-A 1 1
2 2 1 As Needed
As Needed
As Needed
As Needed
As Needed
As Needed As Needed Counter Shaft Bore Plug Input Shaft Snap-Ring 6th Gear Snap-Ring
Reverse/Crawl Gear Snap-Ring 4th Gear Snap-Ring Motorcraft® Engine Shampoo and Degreaser
Motorcraft® High Performance Engine RTV Silicone Dual Clutch Transmission Fluid Motorcraft® Metal Brake Parts Cleaner
Motorcraft® Metal Surface Prep Wipes
Motorcraft® DOT 4 LV High Performance Motor Vehicle Brake Fluid
Motorcraft® Silicone Gasket Remover 1 1 1 1
1 2 1 1 1 1 1 As Needed 1 As Needed 1 As Needed 1 As Needed 1 As Needed 1 As Needed 1 1 This may be called Compression Ring Quantity refers to the amount of the service part number required to repair the vehicle.
Unit of Issue refers to the number of individual pieces included in a service part number package. Piece Quantity refers to the total number of individual pieces required to repair the vehicle.
As Needed indicates the amount of the part may vary and/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 – Parts To Inspect And Replace Only If Necessary
Service Part Number Quantity Description Unit of Issue Piece Quantity
MU7Z- 7230-A If Needed Shift Fork 3rd and 4th Gears 1 1
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 2021-2023 Bronco MT88 Transmission: Replace Synchronizer Assemblies for 3rd And 4th Gear And The 4th Gear Synchronizer Ring (Can Be Used With Operation B And Or MT) (Do Not Use With Any Operations Outside Of This Article)
Additional Time For Vehicles With Electronic Sway Bar Disconnect (Can Be Used With Operation A)
Additional Time To Replace Any Additional Parts Discovered During Inspection (Can Be Used With Operation A) Operation No.
232409A 232409B MT232409 Time 9.2 Hrs. 0.8 Hrs. Actual Time Repair/Claim Coding Causal Part: Condition Code: 7107
13 Service Procedure
1. Remove the transmission from the vehicle. Refer to Workshop Manual (WSM), Section 308-03.
2. Disassemble the transmission. Refer to WSM, Section 308-03 > Disassembly > Transmission, Steps 1-34.
3. Remove the output shaft from the transmission case to gain access to the 3rd and 4th gears and synchronizer assemblies. Refer to WSM, Section 308-03 > Disassembly and Assembly of Subassemblies > Input Shaft, Steps 1- 5.
4. Replace the following components and any associated damaged parts. Refer to WSM, Section 308-03. • 3rd gear.
• Synchronizer assemblies for 3rd and 4th gears.
• 4th gear synchronizer ring. (Figure 1) Figure 1 • Inspect and replace any other damaged parts as needed. NOTE: 3rd gear is part of the input shaft. The 4th gear assembly is part of the output shaft assembly and does not require replacement, unless damage is found. In this transmission 4th gear uses a synchronizer ring to align the synchronizer assembly with the gear during shifts.
5. Assemble the transmission. Refer to WSM, Section 308-03.
6. Install the transmission. Refer to WSM, Section 308-03. © 2023 Ford Motor Company 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 de this information with updates. The most recent information is available through Ford Motor Company’s on-line technical resources.
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