Ford Performance Ring And Pinion Gear 4.09 Set 8.8" IRS 2015-2022

Ford Performance:
100% of 100


  • For 8.8" IRS Center Section
  • 4.09:1 Gear Ratio
  • Includes OEM Crush Sleeve
  • OEM Quality
MSRP $349.00
You save 27%

Ford Performance 4.09 Ring and Pinion Gear Set for all 2015, 2016, 2017, 2018, 2019, 2020, 2021, and 2022 Mustangs with the 8.8" IRS Rear End.

Are you looking for a cheap and easy way to modify the Rear Axle of your 2015-2022 S550 Mustang? If so you might be interested in this 4.09 Ring and Pinion Gear Set from Ford Performance. This Ford Performance 4.09 Ring and Pinion Gear Set will accelerate quicker at a higher top speed, with this set from Ford Performance, you’ll have the correct high-quality parts to take full control over your 2015+ Mustang.

Features and Benefits:
- Strong Unmatched Forged Construction and Quality
- Quiet Worry-Free Performance
- Corrosion-Resistant Black Oxide Finish
- Perfect for Street or Track Use
- Proudly Made in the USA!
- Professional Installation is Highly Recommended

*Will not fit earlier 8.8-inch straight axles found in previous generations.
*Will not fit 2015+ Mustangs originally equipped with a rear-end housing with factory installed 3.15 gears.

Please Note: Requires M4210B3, the S550 Ford Performance 8.8” IRS Ring & Pinion Installation Kit

Tech Tip: After installation of your new FRPP 4.09 Ring and Pinion Gear Set, you will need to adjust the rear axle ratio in the body control module in order to re-calibrate your speedometer. This can be adjusted for if you have previously purchased one of the new Ford Performance Power Packs for the 2015+ Mustang. Calibration support for 2022+ Mustangs is NOT available at this time.

The Ford Performance 4.09 Ring and Pinion Gear Set is made in the United States at Ford's Sterling Axle Plant. The lower the ratio (higher the number), the quicker your car will accelerate and you will feel the difference. The Ford Performance Ring and Pinion Gear is the choice of championship road racing and drag racing teams around the world. The Ring and Pinion Gear features a superior surface finish that is hardened for the strongest and quietest performance on the market.

California Residents: Proposition 65 Warning

Installation Videos

Video Transcript

We’re here with a set of 409 gears fitting your 2015-2017 Mustang from Ford Performance. These 409 to one rear gears are great with getting additional acceleration of any 2015-2017 Mustang. They'll be direct replacements for the stock gears in your eight point IRS on every Mustang with the exception of those that came factory with 3.15 gears. These are made in the USA and feature a black oxide coating for a nice quiet installation. This 409 gear set includes the ring pinion oil with the new pinion nut and a crush sleeve. Recalibrating your speedometer will be necessary with installation.

Vehicle Fitment

This product will fit the following Mustang years:

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