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

Item 21104G99
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    Features & Details

    • 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 -

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

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          Customer Reviews (15) Write a Review

          Overall Rating 5

          out of 5 stars

          Installation Time:Full Day

          Installation Cost:$250-$500

          • Performance Gain 5 5
          • Fit 5 5

          • 5/5

            Installation Time: Afternoon

            July 11, 2019


            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.


            Year: 2002 Submodel: GT

            Helpful (1)

          • 5/5

            Installation Time: Afternoon

            December 02, 2018

            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!!!


            Year: 2004 Submodel: Mach 1

            Helpful (5)

          • 5/5

            Installation Time: Afternoon

            June 03, 2018

            overall project went well

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


            Year: 2001 Submodel: GT

            Helpful (8)

          • 5/5

            Installation Time: Full Day

            July 12, 2017

            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!


            Year: 2003 Submodel: Mach 1

            Helpful (6)

          • 5/5

            Installation Time: Afternoon

            July 07, 2017

            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!


            Year: 2003 Submodel: GT

            Helpful (7)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            October 23, 2016

            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.


            Year: 2004 Submodel: Mach 1

            Helpful (5)

          • 5/5

            Installation Time: Weekend

            March 01, 2014


            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!


            Year: 2003 Submodel: GT Danville, KY, USA

            Helpful (5)

          • 5/5

            Installation Time: Full Day

            July 06, 2013

            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.


            Year: 1999 Submodel: Cobra Orlando, FL, USA

            Helpful (5)

          • 5/5

            Installation Time: Afternoon

            March 22, 2013

            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!


            Year: 2001 Submodel: Cobra Enterprise, AL 36330, USA

            Helpful (5)

          • 5/5

            Installation Time: Afternoon

            December 09, 2011

            awesome pull

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


            Year: 2001 Submodel: GT spring,tx

            Helpful (9)

          • 5/5

            Installation Time: Shop Install

            November 18, 2011

            Excellent Performance!

            I have an 03 GT Automatic with every bolt on out there, except the Procharger! I was a little worried about going from the 3.27 stock gears to the 4.30's. Holy S*** the difference is amazing! The cost was the install of , gears, carbon fiber clutches, Tranny Shift kit, trac lock rebuild, and X-pipe. At 65mph I run at 2300 rpm's. The gears are amazing! Just make sure you have the tread to hold it on the road. I have 315/35/17 w/ Nitto Drag Radials and I smoke em at a 25mph roll. Time for new suspension! Do Not Fear The gears! Excellent product Excellent customer service! Thanks AM Lorne Abbett


            Year: 2003 Submodel: GT Portland, OR

            Helpful (10)

          • 5/5

            March 09, 2010

            Motive 4.30's

            Switched from 4.10s, and like these even better. I can only imagine how much I'd love them if I was still cruising around with 3.27's.


            Helpful (6)

          • 5/5

            February 04, 2009

            Motive is the way to go

            Great product, No gear noise and pulls really hard!

            Jordan D

            Helpful (7)

          • 5/5

            September 13, 2008

            4.30 or 4.10


            Frank E

            Year: 1999 Submodel: GT

            Helpful (8)

          • 5/5

            November 29, 2007

            Wake Up Call!!!

            If you are on the fence to go with 4.10\'s or 4.30\'s with your mustang (manual). I say go all out with 4.30\'s. At 70 mph my tach rides at just a hair under 2.5k. The car strait up scoots. (Take your time with install) No gear howl to report. Great product. (Bearing kit w/shims is a must.) Great buying experience. Have and will buy from American Muscle again!!!


            Helpful (7)

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