Ford Performance Ring And Pinion Gear 3.73 Set 8.8" IRS 2015-2017

Ford Performance: M-4209-88373A
MSRP: $249.00
CJ's Low Price:
$199.00
1480723200 59043
Pick up the necessary Friction Modifier and Installation Kit to go along with your new Ring & Pinion gears.
CJ's Low Price:
$10.99
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Ford Performance Ring And Pinion Gear 3.73 Set 8.8" IRS 2015-2017
Ford Performance Ring And Pinion Gear 3.73 Set 8.8" IRS 2015-2017 Ford Performance Ring And Pinion Gear 3.73 Set 8.8" IRS 2015-2017 Ford Performance Ring And Pinion Gear 3.73 Set 8.8" IRS 2015-2017 Ford Performance Ring And Pinion Gear 3.73 Set 8.8" IRS 2015-2017 Ford Performance Ring And Pinion Gear 3.73 Set 8.8" IRS 2015-2017 Play Ford Performance Ring And Pinion Gear 3.73 Set 8.8" IRS 2015-2017 Video 1
Ford Performance

Product Description

Ford Performance 3.73 Ring and Pinion Gear Set for all 2015, 2016 and 2017 Mustangs with the 8.8" IRS Rear End.

Ring & pinion sets have proven to be one the most popular modifications for just about any Mustang owner. So much about how your Mustang feels can be controlled by replacing the factory Ring & Pinion Gears in your 2015-2017 Mustang. Whether you’re looking for faster acceleration or a higher top speed, with this set from Ford Performance , you’ll have the correct top quality parts to take full control over your S550.

All Ford Performance (formerly Ford Racing) Ring & Pinion Gear Sets are 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 in the "seat of your pants". Ford Performance’s 8.8" gears are the choice of championship road racing and drag racing teams around the world. Featuring OEM quality, a superior surface finish, hardening and strict manufacturing consistency, this gear set will provide you the strongest and quietest performance on the market today!

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

Please Note: Requires M4210B3, the 2015-2017 Ford Performance 8.8” IRS Ring & Pinion Installation Kit

*Will NOT fit earlier 8.8-inch straight axles found in previous generations.
*Will NOT fit 2015-2017 Mustangs originally equipped with a rear-end housing with factory installed 3.15 gears. 

Tech Tip: After installation of your new FRPP 3.73 Ring and Pinion Gear Set, you will need to adjust your rear axle ratio with a handheld tuner (not Included) in order to re-calibrate your speedometer.

If you're looking for parts for your 2015-2017 Mustang, you should start by looking at the several Mustang parts that CJ Pony Parts offers from Ford Performance (formerly Ford Racing). By buying your Ford Performance parts from CJ Pony Parts, you know you're getting your Mustang parts from a reliable, reputable dealer, since CJ Pony Parts is a Top 10 Ford Performance Dealer and has been for the last 10 years. When you buy your Ford Performance Mustang parts from CJ Pony Parts, you know you have a winning combination.

Order the Ford Performance 3.73 Ring and Pinion Gear Set M-4209-88373A for your 2015-2017 Mustang that's equipped with the 8.8" IRS Rear End from CJ Pony Parts today!

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Installation Instructions

Mustang Installation

Mustang Applications

This product will fit the following Ford Mustang years:

Product Reviews

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Product Questions

I have 2016 GT with 3:55- Do you think that there would be that much if a difference or that I would notice that much of a difference going to 3:73s?

Asked by: pnypwr5
I personally went from 3.55 to 3.73 and definitely noticed a difference for the better. The 3.73s are much more suited for this car, especially if you plan on staying NA.
Answered by: CJPP Dave
Date published: 2016-11-28

Hey, quick question so i have the 2016 GT manual transmission premium model i believe it comes with the 3.31, so can i change it to the 3.71 ratio and what exactly do i need to change or buy

Asked by: hihilaith
You will need this, http://www.cjponyparts.com/ford-racing-ring-and-pinion-gear-3-73-set-8-8-irs-2015-2017/p/M4210B3/, and this, http://www.cjponyparts.com/ford-racing-ring-and-pinion-gear-3-73-set-8-8-irs-2015-2017/p/M19546A/
Answered by: rk cjpp
Date published: 2016-10-10

I just got the roush supercharger installed on my 2015 GT. It currently has a 331 gear. Would it be worth going to a 355 or 373?

Asked by: hwk689
If you are supercharged there is no need to "upgrade" to 3.73 has you have enough power on the lower rpm end.
Answered by: larsipulami
Date published: 2016-09-05

I have a 2016 GT . How do I know what gears I have?

Asked by: Manuel30
If your 2016 GT is a Performance Pack Model, it will have 3.73 gears. If you have a manual transmission 2016 GT you will have 3.31 gears standard but had the option for 3.55 or 3.73 gears. If you have an automatic transmission 2016 GT you will have 3.15 gears standard but had the option for 3.55 gears. The information will be on the original window sticker, but sometime there is an actual sticker on the rear differential that says what gears are installed.
Answered by: CJPP Dave
Date published: 2016-05-31

I have a 2015 Mustang ( manual ) can I upgrade to a 3:73 ?

Asked by: SS2015
Yes you can as long as you don't already have the 3.73 gears.
Answered by: rk cjpp
Date published: 2016-05-26

Will it fit on a 2016 v6 muatang

Asked by: hd84
If you have the cast aluminum housing that has factory installed 3.15 gear ratio this part will not work.
Answered by: rk cjpp
Date published: 2016-03-28

Generally speaking, what's the cost to have these installed? 

Asked by: Divemaster94
Labor rates vary so much by area. It usually ends up being a 2-3hr job, maybe less for a very skilled shop that has done the installation before on a 2015-2016 Mustang. Most shops charge anywhere from $80-120/hr, so anywhere from $160-360 is a wide ballpark, but it should give you an idea of what to expect.
Answered by: CJPP Dave
Date published: 2015-12-28

I have a 2015 GT automatic with 3.15 ratio. I want to upgrade to 3.73, what exactly do I need to purchase with this product in order to upgrade my mustang?

Asked by: hsbrutal666
You will also need part #M-4210-B3 mounting kit and part #M-19546-A12 friction modifier.
Answered by: rk cjpp
Date published: 2015-12-14
  • 2016-12-03T07:50CST
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Product Video

Ford Performance Ring And Pinion Gear 3.73 Set 8.8" IRS 2015-2017 Video Transcript
By Bill Tumas: We’re here with Ford Racing's 3.73 Ring and Pinion set fitting your 2015 Mustang.

Changing to numerically higher rear gears has always been a great way to add acceleration to your Mustang. This ring and pinion set from Ford Racing is specifically designed for the IRS found on the 2015 Mustang, and will not work on a solid axle. It includes a new ring gear, new pinion, new crush sleeve, and a new bolt.

This 3.73 ring and pinion set from Ford Racing is a great way to increase the acceleration on your 2015 Mustang. Other ratios are also available.