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Ring and Pinion Gear Kit; 3.55 Gear Ratio (86-93 GT)

Item 21613G87
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      Product Information

      Features, Description, Reviews, Specs & Installation

      Features

      • USA Standard Gear
      • Manufactured from 8620 Gear Steel
      • 3.55 Gear Ratio
      • 8.8" Ring Gear Diameter
      • Fits 1986-1993 LX 5.0, GT, and SVT Cobra Mustangs

      Description

      Wake Up Your Pony. Installing a set of steeper gears is a great way to get your Mustang into the power band quicker for improved low end torque and faster acceleration off the line. A set of USA Standard Gears will really wake up your Pony.

      Better Than OEM Quality. Using state-of-of-the-art equipment and manufacturing techniques USA Standard Ring & Pinion sets are made to higher than OEM standards from high grade 8620 gear steel and are backed by a one year warranty.

      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 USA Standard Gear 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.

      Fitment: 1986 1987 1988 1989 1990 1991 1992 1993 Details

      MPN# ZG F8.8-355

      CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

      5.0

      Customer Reviews (2)

      Write a Review

      Ratings Summary

      5.0 out of 5 overall rating from 2 customers

      Installation Time: Shop Install

      Installation Cost: $250-$500





      • April 14, 2018

        5 1988 LX - MarcN Installation Time: Shop Install Installation Cost: $250-$500

        Very Satisfied

        I received my 3.55 gears within a week of ordering them. I was very satisfied with the shipping, the guality and have had no issues since installing them.

        Helpful (12)
      • December 11, 2014

        5 1988 GT - Erikkk30

        Great product

        Great product. It took awhile to install but once it was on you can feel the difference at a dead stop launch.

        Helpful (14)

      Questions & Answers (0 answers)

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      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Ring gear
      • (1) Pinion gear

      Tech Specs

      Approximate RPM for 1986-1993 GT


      Manual
      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


      Automatic
      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

      • GT - 87, 88, 89, 90, 91, 92, 93
      • LX - 87, 88, 89, 90, 91, 92, 93
      • Other - 86

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