$7,000 Summertime Mustang Build Enter Now!
Talk to a Mustang Expert
1-888-332-7930
Mon - Sun, 8:30 AM EST - 11:00 PM EST

Free Shipping On Orders Over $49. Details

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

Market Price $184.12 You Save 13% ($24.02)
Our Price

$160.10

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

In Stock Ships same business day. Choose options to add to cart

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 (1)

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 2 Reviews

Customer Photos

You Might Also Like

14 Questions / 5 Answers

Ask a Question

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)

"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 (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

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

Jeremiah

  • 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.

    KevinD92

Helpful (0)

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

Jam

  • 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.

    AMJEFF

Helpful (0)

More Products You Might Like

Customer Reviews (2) 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 (1)

  • 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)

Related Mustang Categories