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Ford Performance Ring Gear and Pinion Kit - 3.55 Gears (11-14 V6; 86-14 V8, Excluding 13-14 GT500)

Market Price $198.87 You Save 12% ($22.88)
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  • Item 50166

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    Features & Details

    • Strong Forged Construction
    • For Street or Track Use
    • Ford Racing Quality
    • 3.55 Gear Ratio
    • 8.8" Ring Gear Diameter
    • Fits 1986-2014 V8 and 2011-2014 V6 (Excludes 2013-2014 GT500)

    Improve ET's and low end torque. Are you looking to get more low end grunt off the line and lower ET's at the same time? Then look no further than installing a set of steeper gears in your Pony. Ford Racing Ring and Pinion Gears are perfect for street, road, or race use.

    Superior Quality. These Ford Racing 3.55 Mustang ring and pinion gears feature a super strong forged construction, CNC cut & lapped gear teeth, and 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 Ford Racing Speedometer Recalibration Tool is an inexpensive way to fix this issue.

    Application. This Ford Racing Ring and Pinion Gear set will fit all 1986 to 2014 V8 Mustangs including GT, Bullitt, Mach 1, Cobra and the 11-14 V6 Mustangs equipped with the 8.8" rear end. A master bearing kit is recommended by most installers, especially on high mileage vehicles, see drop down option above.

    Attention 2010 and newer Mustang Owners. Starting in 2010 Ford changed the inner rear gear pinion bearing in all 8.8" equipped Mustangs. Because of this you will require a new 8.8" rear gear pinion bearing (Ford part# 9L3Z-4630-A) for proper installation, please see drop down option above.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. You can also save money on your installation labor by having your Trac-Lok rebuilt at the same time as your gears are installed, see drop down option above.

    Installation & Tech
    Differential Gears - Installation Instructions! Differential Gears - Installation Instructions! Mustang Rear Gears - Tech Article Mustang Rear Gears - Tech Article

    Fitment: 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 Details

    MPN# M-4209-G355A

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    Hardware included:
    • Ring
    • Pinion
    • Crush sleeve
    • Pinion nut
    • Shims
    Installation Info
    Tech Specs
    Will it fit my Mustang?
    • Boss 302 - 12, 13
    • Bullitt - 01, 08, 09
    • Cobra - 93, 94, 95, 96, 97, 98, 99, 00, 01, 03, 04
    • Cobra R - 93, 95, 00
    • GT - 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14
    • GT500 - 07, 08, 09, 10, 11, 12
    • LX - 87, 88, 89, 90, 91, 92, 93
    • Mach 1 - 03, 04
    • Other - 86
    • V6 - 11, 12, 13, 14

    Fits Mustangs equipped with a 8.8" rear end

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        Questions & Answers (1)

        1 Top Rated Question

        2014 V6 manaul with 273 gears to a 373 gears I have a 2014 V6 Mustang with a 6 speed manual with 273 gears. Will the 373 gears be too much for the V6 ? I have already a CAI, Magna Flows, Airaid Throttle Body Spacer, BBK 73mm Throttle Body and a Bama Tuner. Also with the Bama Tuner do I need to buy the tool to recalibrate my speedometer ? When ordering how do I tell if my rear is a 8.8 or are all the 2011- 2014 the same size rear.. Also how must lost of mpg will I lose approx. I'm getting 32.4 now.

        • 3.73 Gear will be a great upgrade for your V6 Mustang. You will take off faster from the line but it will not be to aggressive where you don't want to daily drive the car. Since you already have a Bama Tuner, you will not need to buy the Calibration Tool. The Tuner is able to calibrate the speedometer for you. Your 2014 Mustang V6 comes with an 8.8" Rear End. You will get a small decline in MPG due to the larger gear ratio. It will also depend on how you drive the car. For a proper install, you will also need the Ford Rear Gear Pinion Bearing - 8.8in (10-14 V8; 11-14 V6), item # 52994, ( and the Motive Rear End Installation and Bearing Kit - 8.8 in. (86-14 V8; 11-14 V6), item # 21201, ( In 2010, Ford changed the inner rear gear pinion bearing. This requires the use of the 8.8" Rear Gear Pinion Bearing. Also, it is a good idea to replace all bearings and bolts that involve the rear end. This is because parts eventually wear out and since you are installing a larger gear, it can cause unnecessary wear.

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          Customer Reviews (19) Write a Review

          Overall Rating 4.9

          out of 5 stars

          Installation Time:Full Day

          Installation Cost:$100-$250

          • Performance Gain 4.68421 4.7
          • Fit 4.789474 4.8

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            July 12, 2019

            Best gears for Ford

            Use the best quality you can afford, Ford performance all the way


            Year: 2014 Submodel: V6

            Helpful (0)

          • 5/5

            Installation Time: Afternoon

            March 31, 2019

            Awesome upgrade

            If your looking to add some serious performance to your car buy these gears


            Year: 2011 Submodel: V6

            Helpful (0)

          • 5/5

            Installation Time: Afternoon

            March 06, 2019

            355 gear kit

            love everything about these gears, my 3.7 is a totally different animal now, found a shop to install for $499.00 which was resonable and only took a half a day


            Year: 2014 Submodel: V6

            Helpful (0)

          • 5/5

            December 20, 2018


            Fast shipping , item as described and packaging good ,have not had time to install yet


            Year: 1989 Submodel: LX

            Helpful (2)

          • 5/5

            Installation Time: Full Day

            September 13, 2018

            Love the new gears

            These are perfect for the everyday driver looking for that little extra power, without a lot of cost. Works great with a stage 1 clutch, and a motor with mild power address. Recommend this highly


            Year: 2007 Submodel: GT

            Helpful (1)

          • 5/5

            Installation Time: Full Day

            May 18, 2018

            Ford ring and pinion 355 gears

            Best thing I have done to my Mustang lots of low in power the only draw back is my spedo is off 20 mph. I just drove it from Montana to Ca using my gps for my spedo. Took it to my local ford dealor and they could not fix it. on my trip my car had 1000 extra miles show up


            Year: 2011 Submodel: V6

            Helpful (4)

          • 5/5

            Installation Time: Afternoon

            March 18, 2018

            Finally have silence

            I had 3.73s that we’re getting louder and louder as time went on. It got to the point to where my ears would ring if I drove faster than 75mph. I knew it was time to dump them. I installed these along with an Eaton limited slip and I finally have a quiet car again. There is a difference in feel, the car isn’t as snappy as before but it still hits hard. It will be nice to see the difference at the track.


            Year: 2008 Submodel: GT500

            Helpful (4)

          • 5/5

            December 20, 2017


            Parts are what I expected. Have not applied them yet but look of good quality.


            Year: 1991 Submodel: GT

            Helpful (5)

          • 5/5

            Installation Time: Full Day

            October 15, 2017

            more bit

            install in my shop went from 331 to these wakes up car more power when giving it gas coming out turns on road coarse helped in lap time


            Year: 2009 Submodel: GT

            Helpful (4)

          • 5/5

            Installation Time: Afternoon

            October 12, 2017

            3:55 gears

            Great product I was very pleased with the 355 Ford racing gear was on time and packaged great great people to deal with a great price I always order from American muscle They are the best hands down !!


            Year: 1988 Submodel: GT

            Helpful (4)

          • 5/5

            Installation Time: Afternoon

            September 12, 2017


            just do it! don't forget clutch rebuild kit and speedo gear.


            Year: 1998 Submodel: GT

            Helpful (4)

          • 5/5

            Installation Time: Afternoon

            August 03, 2017

            Perfect for boosted applications

            This is a perfect add for boosted applications. I run a 150 shot of nitrous in my 3.7l mustang ( Rocket6 ) and this gearing choice is great for anyone who is serious about track times and trap speeds. Recommend leaving the install to the professionals.


            Year: 2014 Submodel: V6

            Helpful (4)

          • 5/5

            Installation Time: Afternoon

            July 24, 2017

            Night and day difference!

            Compared to the stock 2.73 gears, these gears make a huge difference in acceleration. Your rpms may sit a little higher than normal but as far as gas mileage, I haven't really seen much decline. I would definitely recommend putting a one piece driveshaft in with these. I barely have to give it gas to back up on a hill due to less rotational mass. Would recommend to anyone planning on pushing their car to the next level.


            Year: 2012 Submodel: V6

            Helpful (5)

          • 5/5

            Installation Time: Less than 1 Hour

            February 03, 2016

            Made a huge difference

            I bought this to throw into my 14 v6 and man am I impressed, this is a must have mod if you want to see better performance, I am glad I purchased this. Thanks American Muscle.


            Year: 2014 Submodel: V6 Bossier City, LA

            Helpful (5)

          • 5/5

            Installation Time: Shop Install

            December 22, 2015


            I really love the way it changed my car. Brought it to life!! I also have a procharger so that along with the gears transformed my little 3.7 in to a beast.


            Year: 2013 Submodel: V6 West Valley, UT

            Helpful (5)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            April 19, 2013

            11' v6 automatic with 3:55 installed

            3:55 gear install was in conjunction with Eibach kit and Bama tune. (air intake and exhaust already done). As I was installing the Eibach kit, I spent the extra ten minutes and dropped the axle, took to local shop for gear install. Two hours labor (160.00) with me providing; gears, install kit + bearing (all from AM). Shop commented the Ford Racing gears and best due to being stronger and bevel cut which reduces gear noise. After install, MUCH faster off the line, 2100 rpm at 65-70 mph. Gas milage has dropped 2 mpg. Still getting 20+ mpg and the stang is very fast now (handles great too). Thumbs up. I worried the 3:73 gears would be too much (rpm) for freeway use. Glad I went with 3:55, I would not want any higher rpm for freeway driving. Plenty tall enough for off the line, first gear is used up very quickly.


            Year: 2011 Submodel: V6 San Luis Obispo, CA, USA

            Helpful (4)

          • 5/5

            Installation Time: Weekend

            November 08, 2012

            Great compromise

            I bought the v6 for MPG but realized there was potential to maintain some MPG but get more pull. I have the bama tuner 91r on my car as well. Love the gain down low and freeway is fun too. Cruising at 80mph the rpms are at 2400 to 2500 and it makes it a tad more involved to cruise than before but love the gains.


            Year: 2011 Submodel: V6 salt lake city ut

            Helpful (6)

          • 4/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            August 27, 2012

            More speed

            Increased take off speed. I am pleased with the performance


            Year: 2011 Submodel: GT Pennsylvania, USA

            Helpful (5)

          • 5/5

            Installation Time: Shop Install

            January 27, 2012

            Best bang for the buck

            The 2.73 gears in my 2012 Mustang V6 6-Speed were great for good gas mileage, but terrible for performance. I purchased these Ford Racing 3.55 gears and had them installed by a local shop with a new bearing kit and the car is a different animal. I have raced many S197 Mustang GT's at the track and have taken quite a few down. The 3.7 is no slouch and these 3.55's make it shine. The cars best time at the track was 13.5 @105mph and the gears are what mostly got me there. I can still get great gas mileage with them and they have great driveability around town. Buy these gears, no whine or noise, you won't be disappointed.


            Year: 2012 Submodel: V6 Long Island, NY

            Helpful (6)

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