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TECHNICAL SERVICE BULLETIN 23-2409
MT88 Manual Transmission - No 3rd Gear And/Or Grinding Noise Going 08 December
Into 3rd And/Or 4th Gear
This bulletin supersedes 23-2219. Reason for update: Incorrect or Missing Parts
Model:
Ford Transmission: MT88 Manual Transmission
2021-2023 Bronco
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 : anti Unit of |Piece
a
JB3Z-4B496-B Front Driveshaft Bolts And Retaining 1
Straps
LB3Z-4B496-A. Rear Driveshaft Bolts And Retaining 41
Straps
W710624- 1 : p 1 1
ws00121- 4 4 4
W520103- 4 4 1

MU7Z-7P497- 1 1 1 This may be called
ZC-20 AS Motorcraft® Engine Shampoo and 41 As Needed
Needed | Degreaser
TA-357 AS Motorcraft® High Performance 1 As Needed
Needed | Engine RTV Silicone
XT-11-QD6 Newsed Dual Clutch Transmission Fluid As Needed f
PM-4-A As Motorcraft® Metal Brake Parts 1 As Needed
Needed | Cleaner
ZC-31-B AS Motorcraft® Metal Surface Prep 1 As Needed
Needed | Wipes
PM-20 As Motorcraft® DOT 4 LV High 4 As Needed
Needed | Performance Motor Vehicle Brake
Fluid
ZC-30-A As Motorcraft® Silicone Gasket 1 1
Needed |Remover
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 Unit of Issue | Piece Quantity
MU7Z-7230-A [If Needed|Shift Fork 3rdand4thGears| 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
jo.
2021-2023 Bronco MT88 Transmission: Replace Synchronizer Assemblies for 3rd And 4th 232409A | 9.2 Hrs.
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 232409B | 0.8 Hrs.
Operation A)
Additional Time To Replace Any Additional Parts Discovered During Inspection (Can Be MT232409 | Actual
Used With Operation A) Time
Repair/Claim Coding

Causal Part: 7107
Condition Code:

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
£416092
+ 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 to supersede
this information with updates. The most recent information is available through Ford Motor Company's on-line technical resources