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

Item 50166
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      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation

      Features

      • 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)

      Description

      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 - www.P65Warnings.ca.gov

      5.0

      Customer Reviews (23)

      Write a Review

      Ratings Summary

      5 out of 5 overall rating from 23 customers

      Installation Time: Full Day

      Installation Cost: $250-$500





      • January 02, 2020

        5 2011 GT - Danielerevia Installation Time: Shop Install Installation Cost: $250-$500

        Great gear set

        Going from 3.15 to 3.55 big difference. Ordered with the ford install kit. Came with everything needed

        Helpful (0)
      • October 27, 2019

        5 2014 V6 - JenniferJ Installation Time: Shop Install Installation Cost: $250-$500

        Great purchase

        Fast to ship and packaged well. Had install today and just the drive home can tell a big difference in the performance and take off.

        Helpful (0)
      • July 24, 2019

        5 2004 Mach 1 - Bman Installation Time: Afternoon

        Good gears

        Put these on my 2009 Mercury Grand Marquis. They do whine when off the throttle and was told it's normal... I have 3.73s on my 2004 Mach 1 and those whine too... Normal?

        Helpful (0)
      • July 18, 2019

        5 1989 LX - DanielW Installation Time: Shop Install

        just the right ratio for the street

        The original 2.76:1 ratio meant either cruising below 1500 rpm or above 2500 rpm to keep with the speed limits, with the 3.55:1 I'm able to run between 2000 and 2500 rpm. And the up shift and down shift points are better spaced. I dropped about 4 mpg, but as a wise man said, it's not miles per gallon but smiles per gallon, and this new ratio gives me a lot of smiles per gallon.

        Helpful (0)
      • July 12, 2019

        5 2014 V6 - RichW Installation Time: Shop Install Installation Cost: $250-$500

        Best gears for Ford

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

        Helpful (0)
      • March 31, 2019

        5 2011 V6 - 11faststang Installation Time: Afternoon

        Awesome upgrade

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

        Helpful (0)
      • March 06, 2019

        5 2014 V6 - choppertwo Installation Time: Afternoon

        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

        Helpful (0)
      • December 20, 2018

        5 1989 LX - JeffreyH

        Thanks

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

        Helpful (2)
      • September 13, 2018

        5 2007 GT - JosephB Installation Time: Full Day

        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

        Helpful (2)
      • May 18, 2018

        5 2011 V6 - Bigdan Installation Time: Full Day

        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

        Helpful (5)

      Questions & Answers (3 answers)

      3 Top Rated Questions

      I have an 01 gt manual trans is there a chart that can show me speeds and rpm wondering about hwy speed rpms

      Should I go with 3.55s or 3.73s for a turbo setup?

      • There isn't exactly a "correct" answer, however the higher the gear ratio, the quicker you'll be getting to 60, but the lower your top speed will be. You should be able to make a decision based on this relative to your application.

      Helpful (0)

      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, (http://www.americanmuscle.com/88-gear-assembly-2010.html) and the Motive Rear End Installation and Bearing Kit - 8.8 in. (86-14 V8; 11-14 V6), item # 21201, (http://www.americanmuscle.com/rearendrebuild.html). 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.

      Helpful (0)
      Post Your Question

      Installation & What's in the Box

      Installation Info

      What's in the Box

      Hardware included:
      • Ring
      • Pinion
      • Crush sleeve
      • Pinion nut
      • Shims

      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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