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Motive Gear Performance Plus Ring and Pinion Gear Kit; 4.30 Gear Ratio (99-04 GT)

Item 21104G99
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      Product Information

      Features, Description, Reviews, Specs & Installation


      • Superior Quality
      • CNC-Cut from 8620 Gear Steel
      • 4.30 Gear Ratio
      • 8.8" Ring Gear Diameter
      • For Street or Track Use
      • Fits 1999-2004 GT, Bullitt, Mach 1 and Cobra Mustangs


      Improve Overall Performance. Improve your V8-powered Mustang's off-the-line responsiveness with a set of 4.30 gears from Motive. Steeper gears get you into your power band faster for improved acceleration and lower times. A set of 4.30 gears are a great choice for the performance-oriented Pony that still needs to be driveable on the street.

      Superior Construction & Precision Fit. These Motive ring and pinon gears are CNC cut from high grade 8620 gear steel, and factory lapped for precision fit. Each set is hardness tested prior to leaving the factory to ensure the highest quality. Unlike other brands, Motive Gears do not have a reputation for "gear whine".

      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 Motive Performance Plus 4.30 Ring and Pinion Gear set will fit all 1999 to 2004 V8 Mustangs including the GT, Bullitt, Mach 1 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: 1999 2000 2001 2002 2003 2004 Details

      MPN# F888430

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (15)

      Write a Review

      Ratings Summary

      5.0 out of 5 overall rating from 15 customers

      Installation Time: Full Day

      Installation Cost: $250-$500

      • July 11, 2019

        5 2002 GT - JonD Installation Time: Afternoon


        Replaced a newer ford performance 4:10 that was noisy with this and Man U can’t hear a thing. Super quiet and big difference off the line. Love it glad I made the change.

        Helpful (3)
      • December 02, 2018

        5 2004 Mach 1 - JerryS Installation Time: Afternoon

        Mach 1 Madness

        I recently purchased a 2004 Azure Blue Mach 1 mustang after months of searching. The only downfall's an automatic......I know I know.....there goes my man card.....but wait....I replaced my man card with pure balls of steel,torque multiplying,sweet sweet smell of tires burning Motive 430 gears. You pull to the line....turn off you OD and traction control....wait for the signal and BAM!!!! You floor it as it sucks you back in your seat with pure American Muscle Awesomeness!!! It's perfect for a N/A Mach 1. Especially for the automatic. The gears are quiet 70mph=2800 RPM Gas mileage= Bwahaha!!! It's a muscle car!!!

        Helpful (6)
      • June 03, 2018

        5 2001 GT - CliffordR Installation Time: Afternoon

        overall project went well

        430 motive gears work well so far very quite and gives my 2001 mustang lots of sap note automatic

        Helpful (9)
      • July 12, 2017

        5 2003 Mach 1 - DanielM Installation Time: Full Day

        Just what the car needed

        Fitment was spot on. Using factory pinion shim and the assrorted shims in the install kit, all specs were perfect. LEss noise than my factory gears and woke the car up. Feels like the car dropped 500 pounds now. Good for my MAch 1!

        Helpful (7)
      • July 07, 2017

        5 2003 GT - DragGT Installation Time: Afternoon

        New gears

        Bought these to go with my 31 spline axles and cobra lsd. Gear price was great and they arrived packaged well in perfect condition. Getting them installed in a 98gt rear end I'm putting in my 2003 gt. 150.00 bucks to install so it will be a great performance increase. Thanks American Muscle!

        Helpful (7)
      • October 23, 2016

        5 2004 Mach 1 - MW Installation Time: Shop Install Installation Cost: $250-$500

        4.30 Mach 1

        I have only had the gears in the car for about the last 300 miles. The car drives great. The acceleration is greatly improved. These gears compliment the torque range of the car better than the original 3.55s. I can finally use fifth gear around town. The highway is not a problem. The RPMs are, of course, higher but the car can negotiate speeding up in traffic while still in fifth gear. There is some extra noise in the rear end but its an acceptable amount given the bigger ring and pinion. I hear the transmission whining from the extra wind up. All is very acceptable and livable though. The acceleration will more than make up for the undesirable noise. I think these are a must for naturally aspirated 4v cars.

        Helpful (6)
      • March 01, 2014

        5 2003 GT - AmericanMustang Installation Time: Weekend


        All I can say is my girlfriend was trying to find the "Oh Dang handle" after the install was finished haha but this is a very excitant mod if you was some "get up and go!" For your pony, I'd recommend this mod to anyone looking for some acceleration!

        Helpful (5)
      • July 06, 2013

        5 1999 Cobra - Slow99 Installation Time: Full Day

        Don't fear the gear

        I installed 4.10's in my 99 Cobra a few months after I bought it new. Soon after I wished I had put in the 4.30s. After blowing out my diff after 13 years of high demand driving, I stepped up the gear ratio. The high strung Cobra loves it. With a refreshed traction lok the gears installed perfectly. No whine, clunk, or any of the problems common to a high performance gear swap. The install kit came with everything I needed and the job took one day. I'd compare Motive gears with any brand out there, and after a proper break in, I'll hit the track to find the .3-.4 tenth's of time I think the upgrade will deliver.

        Helpful (6)
      • March 22, 2013

        5 2001 Cobra - nwsm407 Installation Time: Afternoon

        Great gears that you can really feel!

        These 4.30 gears were the perfect pick over the stock gears in my 2001 Cobra. They really woke it up! I highly recommend! Don't Fear the Gear!

        Helpful (6)
      • December 09, 2011

        5 2001 GT - KatieB Installation Time: Afternoon

        awesome pull

        Changed out 4.10 to these and the performance is awesome,still smokes them in 4th gear.Great product!!!

        Helpful (11)

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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 1999-2004 GT

      Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
      1 4482 6275        
      2 2652 3713 4774 5835 6895  
      3 1750 2451 3151 3851 4551 5251
      4 1326 1856 2387 2917 3448 3978
      5 902 1262 1623 1984 2344 2705

      Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
      1 3766 5272 6779      
      2 2055 2878 3700 4522 5344 6166
      3 1326 1856 2387 2917 3448 3978
      4 928 1300 1671 2042 2413 2785

      Will It Fit My Mustang

      • Bullitt - 01
      • GT - 99, 00, 01, 02, 03, 04
      • Mach 1 - 03, 04

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