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Ford Performance 8.8" 3.73:1 IRS Mustang Ring Gear and Pinion Set (2015-2020)

4 Review(s)
$60.00 (23%)
Part Number: 161 M 4209 88373A
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Suggested Mods


Take your 2015+ Mustang to the next level with a Ford Racing IRS Ring and Pinion Set.

The 8.8" rear end has been the standard in performance since its introduction in the Mustang in 1986 and Ford Racing is the manufacturer of choice when it's time to performance build your axle.

Ford Racing's superior surface finish, hardening, and manufacturing consistency provide the strongest and quietest 8.8" gears in the market.

When you're purchasing a new 8.8" gear set make sure your bearings and shims are up to the task with Ford Racing's High Performance Installation Kits.

Note: If you have a OE 3.15 differential you must also upgrade your differential to 161-M-4204-MT or 161-M-4204-M in order to properly install these gears.

Product Benefits
  • Proven Performance
  • Ford Racing Quality
  • Made in the USA

CA Residents: Cancer and Reproductive Harm WARNING

Fitment & Features


Manufacturer: Ford Performance

Installation Information:

Level of Difficulty: Tech Recommended
Install Time: About 4 Hours
Tools Required: Basic Shop Tools

Vehicle Fitment:

Fits Model Year: 2015, 2016, 2017, 2018, 2019, 2020

Customer Reviews

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Average Customer Ratings


Must have
The stock gears are meant for fuel efficiency and keeps your car out of its power band. When I put my 3.73s in it felt like a 30rwhp difference without the actual power out put. They should come this way from ford.
Did you find this helpful?  4 of 5 Found Helpful
Reviewed by:  from Texas on 5/30/2016
Essential Upgrade to your 'Stang
Upgrading the ring and ping ratio is one the bread and butter, essential upgrades on just about any model year Mustang. I saw huge 1/4 mile gains when I changed my '95 Mustang GT's rear rear from factory to 4.10 along with dramatically improved off-the-line performance and faster travel through the power band. Ford Racing gear sets are the highest quality, have never failed me, and delivery hundreds of thousands of miles of quiet performance.
Did you find this helpful?  1 of 2 Found Helpful
Reviewed by:  from California on 2/17/2016
Highly recommend
Did the swap from 3.27 to 3.73. night and day difference! awesome seat of the pants feel! highly recommend this to anyone who is tired of slow winding gears.
Did you find this helpful?  1 of 2 Found Helpful
Reviewed by:  from Florida on 11/7/2015
Racing Gears To Wake Up Your Pony
I had a set of 3.73 gears installed by Steeda recently to replace my stock 3.15's and what a difference in performance. No longer does it take forever to hit my 2011 Mustang GT 5.0 automatic engine's powerband because now with the new gears I'm up there very quickly. These gears are a must have for those running highway gears and want more acceleration from your Ponycar.
Did you find this helpful?  3 of 4 Found Helpful
Reviewed by:  from Texas on 4/27/2015
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