TSB 23-2019

6/13/23, 6:32 AM
2021 Bronco
TECHNICAL SERVICE BULLETIN
23-2019
08 June 2023
MT88 Manual Transmission - Rotational Scraping Noise When Cold And In
Neutral, 1st And/Or 2nd Gear With Clutch Pedal Released
This bulletin supersedes 22-2371.
Model:
Ford
2021-2023 Bronco
Transmission/Transaxle: MT88
Summary
This article supersedes TSB 22-2371 to update the vehicle model years effected.
Issue: Some 2021-2023 Bronco vehicles equipped with a MT88 manual transmission may experience a rotational
scraping noise while the transmission is in neutral, 1st or 2nd gear with the clutch pedal released and may be more
noticeable in ambient temps below 10°C (50°F) and after a cold soak. This noise may diminish as the transmission
warms up. This may be due to the 5th and 6th gear synchronizer rings. To correct the condition, follow the Service
Procedure to replace the 5th and 6th gear synchronizer rings.
Action: Follow the Service Procedure to correct the condition if the vehicle meets the following criteria:
• 2021-2023 Bronco
• Equipped with MT88 manual transmission
• Rotational scraping noise from the transmission in neutral, 1st and/or 2nd gear and clutch pedal
released may be more noticeable in ambient temps below 10°C (50°F) and after a cold soak
• Noise may diminish as the transmission warms up
Parts
Service Part
Number
Quantity Description
W520103S442
1
MB3Z-9450-B
1
W713314S439
1
W500121S439
3
LB3Z-4B496-A
8
JB3Z-4B496-B
6
W710624S300
1
MU7Z-7W441A
1
MU7Z-7107-D
2
BR3Z-7064-A
Unit of
Issue
Piece
Quantity
4
2
1
1
4
2
4
9
Rear Driveshaft Bolts And Retaining Straps
1
8
Front Driveshaft Bolts And Retaining Straps
1
6
4
1
1
1
5th And 6th Gear Synchronizer Rings
1
2
1
Input Shaft Circlip
1
1
MU7Z-7048-A
1
Input Shaft Seal
1
1
MU7Z-7P497A
1
1
1
BR3Z-7052-A
1
1
1
Exhaust Flange Nuts
Exhaust Flange Gasket
Hanger Bracket Bolts
Transfer Case To Transmission Bolts
Crawler/Reverse Gear Synchronizer Roll Pin
Gate Pin
Counter Shaft Bore Plug
Output Shaft Seal
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2021 Bronco
MU7Z-3K050A
2
MU7Z-3K050B
1
MU7Z-3K050C
1
W520214S440
1
W721041S439
1
W721449S439
1
TA-357
As
Needed
Motorcraft® High Performance Engine RTV Silicone
XT-11-QDC
As
Needed
Motorcraft® Dual Clutch Transmission Fluid
ZC-30-A
As
Needed
Motorcraft® Gasket Remover
ZC-31-B
As
Needed
Motorcraft® Metal Surface Prep Wipes
ZC-20
As
Needed
Motorcraft® Engine Shampoo and Degreaser
PM-4-A
As
Needed
Motorcraft® Metal Brake Parts Cleaner (Compliant With Low
Volatile Organic Compound Requirements As Required In Some
USA States)
PM-4-B
As
Needed
Motorcraft® Metal Brake Parts Cleaner (Not Compliant With
Volatile Organic Compound Requirements)
PM-20
As
Needed
Motorcraft® DOT 4 LV High Performance Motor Vehicle Brake
Fluid
Obtain Locally
As
Needed
Plastic Scraper / Plastic Razer Blades
Obtain Locally
As
Needed
Nylon Bristle Brush
Obtain Locally
As
Needed
Lint Free Towel
Obtain Locally
As
Needed
Isopropyl Alcohol (Minimum 90%)
Obtain Locally
As
Needed
Large Zip Ties
Circlip
Circlip
Circlip
Stabilizer Bar Nuts
Stabilizer Bar Studs
Stabilizer Bar Bolts
1
2
1
1
1
1
2
2
4
2
4
2
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 nonwhole numbers, including less than 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
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Operation
Time
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6/13/23, 6:32 AM
2021 Bronco
No.
2021-2023 Bronco Manual Transmission: Replace The 5th And 6th Gear Synchronizer
Rings, Includes Time To Remove And Install The Transmission (Do Not Use With Any Other
Labor Operations)
232019A
10.1
Hrs.
Repair/Claim Coding
Causal Part:
7107
Condition Code: 42
Service Procedure
NOTE: New 5th and 6th gear synchronizer rings are now available with an improved design to correct the
rotational scraping noise. Upon receiving the synchronizer rings, check for engineering part number MU7R7101-GA or later which will be stamped on the rings.
1. Remove the transmission from the vehicle, Refer to Workshop Manual (WSM), Section 308-03.
2. Disassemble the sub-assemblies to gain access to the 5th and 6th gear synchronizer rings. Refer to WSM,
Section 308-03.
3. Replace the 5th and 6th gear synchronizer rings.
4. Assemble the transmission. Refer to WSM, Section 308-03.
(1). The reverse/crawl gear synchronizer assembly must be assembled on the transmission. Refer to Figures 1-2
for an exploded view of the reverse/crawl gear synchronizer assembly.
Figure 1
Figure 2
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2021 Bronco
5. 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.
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