Ford Performance Mustang IRS Ring Gear and Pinion Kit - 3.55 Gears M-4209-88355A (15-19 All)

Ford Performance IRS Ring Gear and Pinion Kit - 3.55 Gears (15-19 All)

$174.99

4 Reviews 15 Answers

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Item 384402

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Features & Details

Ford Racing Quality
Strong Forged Construction
3.55 Gear Ratio
8.8" Ring Gear Diameter
For Street or Track Use
Fits 2015-2019 Mustangs Equipped with IRS

Product Resources

Submit the first photo Customer Reviews (4) Questions (15) & Answers (15)

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 2015-2019 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 2015-2019 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.

Fitment: 2015 2016 2017 2018 2019 Details

MPN# M-4209-88355A

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

What's in the Box

(1) Ring gear
(1) Pinion gear

Installation Info

Installation Time: (approx) a Day

Difficulty Level:Mechanical expertise or professional installation required.

Installation Guides:

No guide available for this part yet. Find out how to get up to $200 for writing an install guide.

Tech Specs

Tech Guides:

Will it fit my Mustang?

Bullitt - 19
EcoBoost - 15, 16, 17, 18, 19
GT - 15, 16, 17, 18, 19
GT350 - 15, 16, 17, 18, 19
GT350R - 15, 16, 17, 18, 19
V6 - 15, 16, 17

These 3.55 gears are not compatible with a 3.15 ratio differential - use differential M-4204-MT or M-4204-M.

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Questions & Answers (15)

5 Top Rated Questions

Hi i got a 16 gt supercharged manual i belive i have the 3.31 gear ratio i was thinking on changing these for a 3.73 or what would you recommend for my ride thanks

Selecting gears comes down to a number of factors, including the primary type of driving done, tire size, and the amount of power you are making. On a supercharged 2016 Mustang, typically the best gearing will come from either a 3.31, a 3.55, or a 3.73, depending on several factors. Please give us a call at 1-844-872-1535 to speak to one of our experts about which gears would be best for your particular setup.

Helpful (3)

"These 3.55 gears are not compatible with a 3.15 ratio differential - use differential M-4204-MT or M-4204-M." How do I know if my V6 has a 3.15?

Hello! The two easiest ways to find out which gears you have in your car is to; First, have your dealership check your VIN, or Second look on your differential as there is a stamp that will tell you.

Helpful (1)

Hi, I have a 2015 mustang gt automatic with the 3.15 gears. If I buy this set and this (M-4204-M) will I need anything else besides maybe a new seal kit to install them on my car. Thanks

Correct to install the Ford Performance IRS Ring Gear and Pinion Kit in a 3.15 geared car you will need the ring and pinion and the Ford Performance Traction-LOK Limited Slip IRS Differential. If you have any other questions or concerns feel free to chat or call in.

Helpful (0)

Would this set up fit on my 2015 ecoboost mustang?

Yes, the Ford Performance IRS Ring Gear and Pinion Set will fit on a 2015 Ecoboost Mustang. Though they are not compatible with a 3.15 differential. If you have 3.15 Gears currently, you will need to use differential M-4204-MT or M-4204-M

Helpful (0)

I have a 2015 v6 automatic trans, my current gearing is 3:15 standard gears, will these 3:55 work on my car?

Since you have the 3:15 gears you will need to upgrade your differential as well. The link below will be the differential that will work with the 3:55 gears. https://www.americanmuscle.com/frpp-34spline-88-irs-diff-2015gt.html

Helpful (0)

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10 More Questions

hello, its can go on a mustang 2015 basic v6 ...?????? 1 answer

Thank you for your question about the Ford Performance IRS Ring Gear and Pinion Set - 3.55:1 Ratio (15-17 All). This gear and pinion set will work for a V6, however you should note that these Ford Performance 3.55 gears are not compatible with a 3.15 ratio differential - use differential M-4204-MT or M-4204-M.

Helpful (0)

Will this fit a 2016 mustang v6 with the stock 3.15 ratio? 1 answer

This will not work with the Mustangs with the stock 3.15 ratio. You will need to use differential item #388769 or Ford Performance item #M-4204-MT.

Helpful (0)

How can I tell what rear end Ratio , I have in my V6 Mustang 2015 ????It doesn't say on the Invoice???? 1 answer

Typically, if the gear ratio is not stated on the invoice, then the vehicle can with the factory option, however, if you contact Ford with your VIN, they can confirm the ring and pinion gear ratio for you.

Helpful (0)

Are the 3:55 or 3:73 compatible with the 2016 v6 in manual? Also, will other performance parts be necessary to hand the those gear ratio's? 1 answer

The Ford Performance IRS Ring Gear and Pinion Sets would be compatible with the 2016 V6 Manual or automatic. No additional mods are required, but an install kit would be needed.

Helpful (0)

I have a 2016 v6 mustang and I want to upgrade from my 3.15 gears what will I need 1 answer

All you will need is the kit that comes with the rear gear and pinion. http://www.americanmuscle.com/search?keywords=gears&generation=2015-2017&vehicleType=Mustang

Helpful (0)

Will these gears work on my ecoboost mustang auto? I have the 3.31 gears now stock 1 answer

The Ford Performance IRS Ring Gear and Pinion Set is not compatible with a 3.15 ratio differential, however, it will work with all the other differentials including your 3.31's.

Helpful (0)

I have a 2016 mustang and was wondering if all I have to do is change out the stock gears and put in these or must I buy something else to make it work 1 answer

These Ford Racing 3.55 gears are not compatible with a vehicle that came stock with a 3.15 ratio differential - use differential M-4204-MT or M-4204-M. Please check what your stock ratio is to determine compatibility

Helpful (0)

So if I current have a mustang with the 3.31 ratio, I can use this to upgrade to the 3.55 ratio? 1 answer

These Ford Racing IRS Ring Gear and Pinion Set - 3.55:1 Ratio (15-17 All) would be a perfect upgrade for any 2015-2017 Mustang. While this is not a very large jump in gear ratios, you will definitely be able to feel the difference on your S550 Stang! For anyone who is thinking about changing gears, it is recommended to get yourself a hand held tuner. This is because your speedometer calibrations will be off. A hand held tuner is an easy fix for this. We offer many different tuners which can be found at the link below. http://www.americanmuscle.com/2015-mustang-chips-tuners.html

Helpful (0)

I have automatic in my 15 GT. it has 315 rear I want to up grade to the 355 what differential should I use to replace my stock one? M-4204-MT or M-4204-M 1 answer

Hi, The Ford Racing T2R Torsen Differential is a High performance Differential it's the same exact one that is found as standard equipment on Performance Pack GT Mustangs. Heres the link http://www.americanmuscle.com/frpp-34spline-88-irs-torsen-diff-1516.html The Ford Racing Traction - LOK Limited Slip IRS Differential is the same as original equipment that came standard on Manual 2015-2017 GT Mustangs. Heres the link http://www.americanmuscle.com/frpp-34spline-88-irs-diff-2015gt.html

Helpful (0)

I see these wont work on a 3.15 ratio differential. So I would need to replace the differential as well with part M-420-M to upgrade? 1 answer

The Ford Performance IRS Ring Gear and Pinion Set - 3.55:1 Ratio (15-17 All) will also need you to use the Ford Performance Traction - LOK Limited Slip IRS Differential - 34 Spline 8.8 in. (15-17 GT) item #388769 (www.americanmuscle.com/frpp-34spline-88-irs-diff-2015gt.html).

Helpful (0)

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Customer Reviews (4) Write a Review

Overall Rating

out of 5 stars

Installation Time:Full Day

Installation Cost:$250-$500

Performance Gain 5 5
Fit 5 5

no one in the world ever gets what they want, and that is beautiful

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5/5

Installation Time: Afternoon

November 23, 2018

Gear change

I needed a little higher rear end ratio for my ride. The 3.55's did the trick

MichaelB

Year: 2015 Submodel: GT

Helpful (5) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
5/5
October 11, 2017

What can I say,it's made by Ford Performance

I use Ford Performance parts whenever possible. I know that it will fit and perform as advertised.

StanS

Year: 2017 Submodel: GT

Helpful (13) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
5/5

Installation Time: Shop Install

Installation Cost: $250-$500

June 14, 2017

Its Ford Performance

I ended up not installing as I decided to go FI. The quality and appearance are top notch. I gave them to a fellow S550 driver who went from the 3.31 to the 3.55. He is staying NA so it works out. I drove his car after the swap and it definitely pulls much harder. First gear is not useless though like with the 3.73s.

repins

Year: 2015 Submodel: GT

Helpful (15) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
5/5

Installation Time: Full Day

December 28, 2015

Great upgrade from the 3.31

This is the OEM Ford Racing 3.31 gears. Exceptional build quality/fit/finish. The price is unbeatable from AM as well - you can't go wrong!

EricM

Year: 2015 Submodel: GT Mohnton, PA

Helpful (14) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
- Bang for your Buck 5
  5

Ford Performance IRS Ring Gear and Pinion Kit - 3.55 Gears (15-19 All)

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