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Ford Performance Ring Gear and Pinion Kit - 3.55 Gears (86-93 GT)

Item 50166G87
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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 1986-1993 GT and 5.0 LX Mustangs
    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 new Speedometer Gear is an inexpensive way to fix this issue.

    Application. This Ford Racing Ring and Pinion Gear set will fit all 1986 to 1993 V8 Mustangs including the GT, 5.0 LX and Cobra models. A master bearing kit is recommended by most installers, especially on high mileage vehicles, 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.

    Fitment: 1986 1987 1988 1989 1990 1991 1992 1993 Details

    MPN# M-4209-G355A

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) Ring gear
    • (1) Pinion gear
    Installation Info
    Tech Specs

    Approximate RPM for 1986-1993 GT

    Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
    1 3689 5165 6641      
    2 2179 3050 3921 4793 5664 6536
    3 1456 2038 2621 3203 3786 4368
    4 1095 1533 1971 2408 2846 3284
    5 733 1027 1320 1614 1907 2200

    Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
    1 2627 3678 4729 5780 6831  
    2 1606 2248 2890 3532 4175 4817
    3 1095 1533 1971 2408 2846 3284
    4 730 1022 1314 1606 1898 2190
    Will it fit my Mustang?

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          Customer Reviews (6) Write a Review

          Overall Rating 5

          out of 5 stars

          Installation Time:Full Day

          • Performance Gain 4.666667 4.7
          • Fit 5 5

          • 5/5

            Installation Time: Shop Install

            June 25, 2018

            Ford Only

            Gears are quiet, very happy with purchase. If you dont buy ford gears, youll will have issues. Ive been there, done that.


            Year: 1988 Submodel: LX

            Helpful (5)

          • 5/5

            Installation Time: Afternoon

            July 10, 2017

            New style Ford Diff Gears

            New 3.55 Ford gears fit perfectly. Please know that these gears are "hobbed" rather than "milled" which makes them stronger but requires different setup than older/aftermarket gear sets. Ran warm the first few miles, don't forget to break them in.


            Year: 1987 Submodel: Other

            Helpful (5)

          • 5/5

            Installation Time: Afternoon

            November 26, 2016

            Fits like a glove!!!

            Good quality and perfect fit. No gear howl like the cheaper knock version that wasn't balanced correctly.


            Year: 1988 Submodel: Other

            Helpful (7)

          • 5/5

            Installation Time: Weekend

            April 11, 2016

            Hard to beat Ford Racing

            I installed these myself, first time ever doing gears. Did a lot of research and took my time. The gears looked great right out of the box. I installed these along with a Torsen T2R with no issues. I'm still in the break-in period and taking it easy but so far all seems well.


            Year: 1990 Submodel: GT

            Helpful (8)

          • 5/5

            Installation Time: Afternoon

            April 26, 2014

            Ford racing 3:55 gears

            Great improvement still manage to get 23 mph on the highway with a 5speed.


            Year: 1993 Submodel: GT Oklahoma City, OK, USA

            Helpful (6)

          • 5/5

            Installation Time: Afternoon

            June 29, 2012

            This product has great features

            Love them, perfect street gears! Still get about 20 mpg on the highway. Made the car even more fun to drive.


            Year: 1990 Submodel: GT Chestertown, Chester, NY 12817, USA

            Helpful (9)

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