MT88 Manual Transmission – Rotational Scraping Noise From Transmission When Cold And In Neutral, 1st And/Or 2nd Gear With Clutch Applied – 2021-2023 Ford Bronco

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NHTSA ID Number: 10237783

Manufacturer Communication Number: TSB 23-2019

Summary

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.

 


This bulletin supersedes 22-2371.

Model:

FordeBay

2021-2023 Bronco

 

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 NumberQuantityDescriptionUnit of IssuePiece Quantity
W520103-S442eBay1Exhaust Flange Nuts42
MB3Z-9450-BeBay1Exhaust Flange Gasket11
W713314-S4391Hanger Bracket Bolts42
W500121-S439eBay3Transfer Case To Transmission Bolts49
LB3Z-4B496-AeBay8Rear Driveshaft Bolts And Retaining Straps18
JB3Z-4B496-BeBay6Front Driveshaft Bolts And Retaining Straps16
W710624-S300eBay1Crawler/Reverse Gear Synchronizer Roll Pin41
MU7Z-7W441-AeBay1Gate Pin11
MU7Z-7107-D25th And 6th Gear Synchronizer Rings12
BR3Z-7064-AeBay1Input Shaft Circlip11
MU7Z-7048-AeBay1Input Shaft Seal11
MU7Z-7P497-AeBay1Counter Shaft Bore Plug11
BR3Z-7052-AeBay1Output Shaft Seal11
MU7Z-3K050-AeBay2Circlip12
MU7Z-3K050-BeBay1Circlip11
MU7Z-3K050-CeBay1Circlip11
W520214-S440 MT88 Manual Transmission - Rotational Scraping Noise From Transmission When Cold And In Neutral, 1st And/Or 2nd Gear With Clutch Applied - 2021-2023 Ford Bronco | small light1Stabilizer Bar Nuts22
W721041-S439eBay1Stabilizer Bar Studs42
W721449-S439eBay1Stabilizer Bar Bolts42
TA-357 MT88 Manual Transmission - Rotational Scraping Noise From Transmission When Cold And In Neutral, 1st And/Or 2nd Gear With Clutch Applied - 2021-2023 Ford Bronco | small lightAs NeededMotorcraft® High Performance Engine RTV Silicone
XT-11-QDC MT88 Manual Transmission - Rotational Scraping Noise From Transmission When Cold And In Neutral, 1st And/Or 2nd Gear With Clutch Applied - 2021-2023 Ford Bronco | small lightAs NeededMotorcraft® Dual Clutch Transmission Fluid
ZC-30-A MT88 Manual Transmission - Rotational Scraping Noise From Transmission When Cold And In Neutral, 1st And/Or 2nd Gear With Clutch Applied - 2021-2023 Ford Bronco | small lightAs NeededMotorcraft® Gasket Remover
ZC-31-B MT88 Manual Transmission - Rotational Scraping Noise From Transmission When Cold And In Neutral, 1st And/Or 2nd Gear With Clutch Applied - 2021-2023 Ford Bronco | small lightAs NeededMotorcraft® Metal Surface Prep Wipes
ZC-20eBayAs NeededMotorcraft® Engine Shampoo and Degreaser
PM-4-A MT88 Manual Transmission - Rotational Scraping Noise From Transmission When Cold And In Neutral, 1st And/Or 2nd Gear With Clutch Applied - 2021-2023 Ford Bronco | small lightAs NeededMotorcraft® Metal Brake Parts Cleaner (Compliant With Low Volatile Organic Compound Requirements As Required In Some USA States)
PM-4-B MT88 Manual Transmission - Rotational Scraping Noise From Transmission When Cold And In Neutral, 1st And/Or 2nd Gear With Clutch Applied - 2021-2023 Ford Bronco | small lightAs NeededMotorcraft® Metal Brake Parts Cleaner (Not Compliant With Volatile Organic Compound Requirements)
PM-20 MT88 Manual Transmission - Rotational Scraping Noise From Transmission When Cold And In Neutral, 1st And/Or 2nd Gear With Clutch Applied - 2021-2023 Ford Bronco | small lightAs NeededMotorcraft® DOT 4 LV High Performance Motor Vehicle Brake Fluid
Obtain LocallyAs NeededPlastic Scraper / Plastic Razer Blades
Obtain LocallyAs NeededNylon Bristle Brush
Obtain LocallyAs NeededLint Free Towel
Obtain LocallyAs NeededIsopropyl Alcohol (Minimum 90%)
Obtain LocallyAs NeededLarge 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

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 MU7R-7101-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

 

5. Install the transmission. Refer to WSM, Section 308-03.

 


3 Affected Products

Vehicle

MAKEMODELYEAR
FORDeBayBRONCO2021-2023

 


1 Associated Document

Manufacturer Communications

23-2019
08 June 2023

MC-10237783-0001.pdf 340.966KB

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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.

1 Associated Document

Manufacturer Communications

22-2371
13 December 2022

MC-10228746-0001.pdf 327.729KB

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Last update on 2025-03-18 / Affiliate links / Images from Amazon Product Advertising API


 

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