2015-23 Mustang 3.31 Rear End Gears by Ford

Price: 429.99 USD
Availability: InStock

If it's time to rebuild your rear-end, be sure to pick up this OE 3.31 gear set for your 2015-2023 from LMR!

Item #LRS-4209-331
MPN# FR3Z4209D

Everyday Low Price: $429.99

Low Stock Only 1 available. Ships tomorrow!

This item is returnable. Details

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LMR showroom & will call pickup service will be closed beginning Monday 9/21/26 for renovations until further notice. Need help? Contact Us.

Benefits

Ford Quality
OE Replacement
Made in the USA!

Features

Renewed Performance
Superior Quality
Includes Pinion Nut & Crush Sleeve

What's in the Box

(1) 3.31 Pinion Gear
(1) 3.31 Ring Gear
(1) Crush Sleeve
(1) Pinion Nut
(1) Inner Pinion Bearing w/ Race
(1) Outer Pinion Bearing w/ Race
(1) Ring Gear Bolt Set
(1) Pinion Seal

3.31 Gears for 8.8" IRS
Rear end gears don't go out often, but when they do - they need to be replaced immediately. Late Model Restoration has you covered with this OEM 2015-2023 3.31 Gear Set to get your S550 running how it should be. Rear-end gears are essential to propelling your Mustang forward!

Note
3.15 ratio differential is not compatible with 3.31, 3.55, 3.73, and 4.09 ratio gears. Use differential M-4204-M.

Application
- Fits 2015-2023 Ford Mustangs

Speedometer Correction

After installation of rear gears, you will need to correct the speedometer. There are different methods to do this depending on year model.

1979-1995 Speedometer Correction
1996-Present Speedometer Correction

Ford Motorcraft Warranty - Click Here

Ford Mustang - 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023

California Residents:

WARNING: Cancer and Reproductive Harm- www.P65Warnings.ca.gov

About This Brand

Ford Motor Company Genuine Parts, Motorcraft® Parts and Ford and Motorcraft Remanufactured Parts are all excellent choices when it comes to performance, longevity and value for your Mustang, SVT Lightning, Raptor, & Bronco. And they’re all backed by a Ford Motor Company limited parts warranty*, so you know their parts you use are going to perform like they should. Put the same parts on your Mustang, Lightning, Raptor, and Bronco that came from the factory!