MT88 Manual Transmission – Rotational Scraping Noise From Transmission When Cold And In Neutral, 1st And/Or 2nd Gear With Clutch Applied – 2021-2022 Ford Bronco

NHTSA ID Number: 10228746

Manufacturer Communication Number: TSB 22-2371

Summary

Some 2021-2022 Bronco vehicles equipped with a MT88 manual transmission may experience a rotational scraping noise in ambient temps below 10C (50F) 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.

 


Model:

Ford

2021-2022 Bronco

 

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:

 

Parts

Service Part Number Quantity Description Unit of Issue Piece Quantity
W520103-S442 1 Exhaust Flange Nuts 4 2
MB3Z-9450-B 1 Exhaust Flange Gasket 1 1
W713314-S439 1 Hanger Bracket Bolts 4 2
W500121-S439 3 Transfer Case To Transmission Bolts 4 9
LB3Z-4B496-A 8 Driveshaft Bolts And Retaining Straps 1 8
W710624-S300 1 Crawler/Reverse Gear Synchronizer Roll Pin 4 1
MU7Z-7W441-A 1 Gate Pin 1 1
MU7Z-7107-C 2 5th And 6th Gear Synchronizer Rings 1 2
BR3Z-7064-A 1 Input Shaft Circlip 1 1
MU7Z-7048-A 1 Input Shaft Seal 1 1
MU7Z-7P497-A 1 Counter Shaft Bore Plug 1 1
BR3Z-7052-A 1 Output Shaft Seal 1 1
MU7Z-3K050-A 2 Circlip 1 2
MU7Z-3K050-B 1 Circlip 1 1
MU7Z-3K050-C 1 Circlip 1 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

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.

 

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 308-03.

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.

 


2 Affected Products

Vehicle

MAKE MODEL YEAR
FORD BRONCO 2021-2022

 


1 Associated Document

Manufacturer Communications

22-2371
13 December 2022

https://www.nhtsa.gov/recalls?nhtsaId=10228746

MC-10228746-0001.pdf 327.729KB

MC-10228746-0001

 


 

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Last update on 2023-03-20 / Affiliate links / Images from Amazon Product Advertising API

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