2024-2025
2015-2023
2010-2014
2005-2009
1999-2004
1994-1998
1979-1993
Installation Time
(approx) a Day
Difficulty Level:
Mechanical expertise or professional installation required.
Installation Guides
No guide available for this part yet.
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Ford Performance IRS Ring and Pinion Gear Kit; 3.55 Gear Ratio (15-25 Mustang)Find parts that fit my vehicle
Item 384402
$0.00
36 Reviews
20 Answers
Our Price
$244.19
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Product Information
Features, Description, Reviews, Q&A, Specs & Installation
Features & Specs
- Ford Racing Quality
- Strong Forged Construction
- 3.55 Gear Ratio
- 8.8" Ring Gear Diameter
- For Street or Track Use
- Fits 2015-2025 Mustangs Equipped with IRS
| Brand | Ford Performance |
| Gear Type | Gears |
| Gear Ratio | 3.55 |
Description
Upgrade OEM Gears. Are you looking to upgrade to a stronger set of rear gears? Then look no further than installing a set of genuine Ford Racing Gears in your 2015-2025 S550 Pony. Ford Racing Ring and Pinion Gears are perfect for street, road, and race applications.
Superior Quality. Manufactured in the USA, these Ford Racing Mustang ring and pinion gears feature a super strong forged construction, CNC cut & lapped gear teeth, and are completed in a black oxide finish to resist corrosion.
Recommended Upgrade. Changing the rear axle gear ratio will throw off the calibration of your Mustangs speedometer, but a Mustang Handheld Tuner is a quick and easy way to fix this issue.
Application. This 3.55:1 Ratio Ford Racing Ring and Pinion Gear set will fit all 2015-2025 Mustangs equipped with an 8.8" Independent Rear Suspension (IRS), including V6, EcoBoost and GT models. A master bearing kit is recommended by most installers, especially on high mileage vehicles.
Application Note. These Ford Racing 3.55 gears are not compatible with a 3.15 ratio differential - use differential M-4204-MT or M-4204-M.
Superior Quality. Manufactured in the USA, these Ford Racing Mustang ring and pinion gears feature a super strong forged construction, CNC cut & lapped gear teeth, and are completed in a black oxide finish to resist corrosion.
Recommended Upgrade. Changing the rear axle gear ratio will throw off the calibration of your Mustangs speedometer, but a Mustang Handheld Tuner is a quick and easy way to fix this issue.
Application. This 3.55:1 Ratio Ford Racing Ring and Pinion Gear set will fit all 2015-2025 Mustangs equipped with an 8.8" Independent Rear Suspension (IRS), including V6, EcoBoost and GT models. A master bearing kit is recommended by most installers, especially on high mileage vehicles.
Application Note. These Ford Racing 3.55 gears are not compatible with a 3.15 ratio differential - use differential M-4204-MT or M-4204-M.
Technical Note. Installation costs will vary, but a good rule of thumb is between $250 and $300. Be sure to work with a reliable shop that you trust for installations.
Ford Performance M-4209-88355A
CA Residents: 
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Installation & What's in the Box
Installation Info
What's in the Box
- (1) Ring gear
- (1) Pinion gear
4.9
