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Ford Performance IRS Ring Gear and Pinion Set - 3.55:1 Ratio (15-17 All)

Market Price $173.99 You Save 9% ($16.08)
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$157.91

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  • Item 384402
  • MPN# M-4209-88355A

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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 2015-2017 Mustangs Equipped with IRS
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 2015-2017 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 2015-2017 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 Details

What's in the Box
  • (1) Ring gear
  • (1) Pinion gear
Installation Info
Tech Specs
Will it fit my Mustang?
  • EcoBoost - 15, 16, 17
  • GT - 15, 16, 17
  • 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.

People Who Bought This Item Also Bought

Most Helpful Reviews

5/5
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 ...

Read More
Helpful (3)

5/5
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!

Helpful (1)

Overall Rating 5 out of 5 stars
Read All 3 Reviews

Customer Photos

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15 Questions / 5 Answers

Ask a Question

"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?

Trocki

  • 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.

    Doug P

Helpful (1)

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

EdwinD

  • 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.

    Rob D

Helpful (1)

Would this set up fit on my 2015 ecoboost mustang?

CarlosM

  • 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

    VincentV

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?

GregoryE

  • 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

    Ricky36

Helpful (0)

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

al

  • 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.

    AMRich

Helpful (0)

Can you change the gears in the Torsen rear end? If so do you sell the gears?

DustinK

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Customer Reviews (3) Write a Review

Overall Rating 5.0

out of 5 stars

Installation Time:Weekend

Installation Cost:$250-$500

  • 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 (3)

  • 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 (1)

  • 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 (0)

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