TECHNICAL SERVICE BULLETIN
MT88 Manual Transmission - Rotational Scraping Noise From
Transmission When Cold And In Neutral, 1st And/Or 2nd Gear With Clutch
Applied

22-2371
13 December
2022

Model:
Ford
2021-2022 Bronco

Transmission/Transaxle: MT88

Issue: Some 2021-2022 Bronco vehicles equipped with a MT88 manual transmission may experience a rotational
scraping noise in ambient temps below 10°C (50°F) and after a cold soak with the transmission in neutral, 1st, and/or
2nd gear and clutch engaged. The noise may go away 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:
• 2021-2022 Bronco
• Equipped with MT88 manual transmission
• Rotational scraping noise from the transmission in ambient temps below 10°C (50°F) and after a cold
soak with the transmission in neutral, 1st, and/or 2nd gear and clutch engaged
• Noise goes away 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

W710624S300

1

MU7Z-7W441A

1

MU7Z-7107-C

2

BR3Z-7064-A

Unit of
Issue

Piece
Quantity

4

2

1

1

4

2

4

9

1

8

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

MU7Z-3K050A

1

1

1

MU7Z-3K050-

1

1

1

Exhaust Flange Nuts
Exhaust Flange Gasket
Hanger Bracket Bolts
Transfer Case To Transmission Bolts
Driveshaft Bolts And Retaining Straps
Crawler/Reverse Gear Synchronizer Roll Pin
Gate Pin

Counter Shaft Bore Plug
Output Shaft Seal
Circlip
Circlip

B
MU7Z-3K050C

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® Silicone Gasket Remover

ZC-31-B

As
Needed

Motorcraft® Metal Surface Prep Wipes

ZC-20

As
Needed

Motorcraft® Engine Shampoo and Degreaser (All Markets
Except Canada)

CXC-66-A

As
Needed

Motorcraft® Engine Shampoo (Canada Only)

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

1

Circlip

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 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
Operation
No.

Description
2021-2022 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)
Repair/Claim Coding
Causal Part:

7107

222371A

Time
9.6
Hrs.

Condition Code: 42

Service Procedure
1. Remove the transmission from the vehicle, Refer to Workshop Manual (WSM), Section 308-03.
2. Disassemble the sub-assemblies to access the 5th and 6th gear synchronizer rings. Refer to WSM, Section 30803.
3. Replace the 5th and 6th gear synchronizer rings.
4. Assemble the transmission per 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

© 2022 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.