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Nitro Gear & Axle Ring and Pinion Gear Kit; 3.90 Gear Ratio (86-93 GT)

Item 404738
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Market Price $264.50 You Save 13% ($34.50)
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$230.00 (kit)

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      Product Information

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


      • Ring Gear and Pinion Kit
      • 3.90 Gear Ratio
      • 30-spline Pinion
      • Precision Machined Using Heavy Duty 8620 Steel
      • Compatible with 10 Ring Gear Bolts
      • 8.80-inch Ring Gear Diameter
      • Computer Controlled and Heat Treated
      • CNC Triple-lapped Composition
      • Improves Low-end Torque and Acceleration
      • Made in the U.S.A.
      • Two-year Warranty
      • Hard Difficulty Installation
      • Compatible with the 1986-1993 Ford Mustang GT


      Low-End Torque Mastered by Nitro Gear & Axle. For one of the finest ring gear and pinion kits on the market, look no further than the Nitro Gear & Axle Ring Gear and Pinion Kit - 3.90 Gears. This unit specializes in delivering torque by optimizing the ratio of your ring and pinion grooves for greater force on each spin.

      Premium Grade 8620 Steel Construction. This American-made unit is constructed using heavy duty 8620, CNC-cut steel, precision machined, CNC triple-lapped and heat-treated for long lasting performance in street or race applications. Other specifications include a 30-spline pinion and compatibility with 10 ring gear bolts, which are not included in the package.

      Warranty. A 2-year warranty covers any defects in materials and workmanship from the manufacturer. Any parts subjected to normal wear, alterations, or improper maintenance may not be included.

      Installation. You should expect to take up to 3 hours installing this unit, with a hard level of difficulty.

      Application. The Nitro Gear & Axle Ring Gear and Pinion Kit - 3.90 Gears is compatible with the 1986-1993 Ford Mustang GT.

      Fitment: 1986 1987 1988 1989 1990 1991 1992 1993 Details

      Nitro Gear & Axle F8.8-390-NG

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Ring Gear
      • (1) Pinion Gear

      Customer Reviews (3)

        Reviews of Nitro Gear & Axle Drivetrain products have an average rating of 4.5 out of 5

          Questions & Answers

          10 More Questions

          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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