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Motive Gear Performance Plus Ring Gear and Pinion Kit - 4.10 Gears (99-04 GT)

Market Price $252.99 You Save 12% ($29.73)
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  • Item 21103G99

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    Features & Details

    • Superior Quality
    • CNC-Cut from 8620 Gear Steel
    • 4.10 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. Wake up your V8-powered Pony and get better acceleration off the line with a set of steeper gears. These high quality 4.10 gears from Motive will give your Mustang more pull off the line and get you into your power band faster for quicker quarters and lower ET's.

    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 4.10 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# F888410

    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 4274 5983        
    2 2529 3540 4552 5563 6575  
    3 1669 2337 3004 3672 4339 5007
    4 1264 1770 2276 2782 3287 3793
    5 860 1204 1548 1891 2235 2579

    Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
    1 3591 5027 6463      
    2 1960 2744 3528 4311 5095 5879
    3 1264 1770 2276 2782 3287 3793
    4 885 1239 1593 1947 2301 2655
    Will it fit my Mustang?

      Customer Photos

        Questions & Answers (1)

        1 Top Rated Question

        Do these gears cause a significant loss in gas milage? Or is it a small amount that wouldn't be noticed very much? And how hard to install?

        • Hi, Switching to Motive Performance Plus 4.10 gears your MPG will decrease about 2-3,This install is pretty difficult if you've never done it before i suggest letting a shop do the work for you, Don't forget to get a Ford Performance Speedometer Recalibration Tool Item #50139 to correct your speedometer after installing these gears. Here is the link

        Helpful (0)
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          Customer Reviews (17) Write a Review

          Overall Rating 4.8

          out of 5 stars

          Installation Time:Weekend

          Installation Cost:$500-$1000

          • Performance Gain 4.5 4.5
          • Fit 5 5

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $500-$1000

            April 08, 2013


            These gears really improved my cobra, not to mention american muscles incredibly fast and superior customer service, ordered some parts from summit racing. I then ordered parts from american muscle the american muscle parts were shipped out half an hour after ordering online and showed up at my door a week before the summit racing parts. Absolutely incredible customer service cannot go wrong with american muscle. As for the gears they really woke my 400rwhp cobra up i would recommend them for any muscle running under 600 rwhp


            Year: 2004 Submodel: Cobra Edmonton, AB, Canada

            Helpful (4)

          • 3/5

            Installation Time: Full Day

            June 21, 2012

            4.10 Motive

            The install was very tedious and I recommend a shop do it. The performance is ok but Im still breaking them in, so cant say to much on that. Noise...well thats a dif story. Nice and quiet on accel. But as soon as you let off the gas and it decels, it wines very loud. Kind of embarrasing at times. Ive looked alot into it but most say its the material and/or backlash. So if noise doesnt bother you, get them. If it does..... research what you want prior.


            Year: 2003 Submodel: GT Jacksonville, NC, USA

            Helpful (4)

          • 5/5

            September 14, 2010

            Motion 4:10 Gears

            These gears are quiet and smooth and make your car feel like someone hid a big block under your hood!

            Jim Wyche

            Helpful (5)

          • 5/5

            August 22, 2010

            Great Gears

            if you have a mustang with an 8.8 rear axle, you have to have these gears, it is NIGHT AND DAY, just from these gears alone i saw a huge increase in power all across the powerband


            Helpful (6)

          • 5/5

            August 21, 2010


            have the 4.10's with my supercharger and WHOOO DOGGY you wanna talk about BANG for your buck, good lord, this is worth the money folks, what are you waiting for? Time to get serious? These gears will give you something to be proud of


            Helpful (3)

          • 5/5

            November 04, 2009

            LoOoOve It

            makes your car really fun to drive. i really recommend to get the bearing kit with this part. it would make your life easier in installing them + no ugly noise afterward.

            sharaf Malebary

            Helpful (7)

          • 5/5

            August 07, 2009


            love the 4.10's, i've used both Ford Racing, and the Motive gears in 3.73 both with the motive gear bearing kit and have no problems at all, no while no clunking, awesome customer service and shipping was very fast, at the best price i could find


            Helpful (5)

          • 4/5

            June 18, 2009

            Noticeable difference

            I just had these installed with a Detroit TrueTrac on my 3.9L V6 and they made a very big difference. They do make some noise but I don\'t think it\'s annoying or unbearable, actually sounds pretty cool when I let off the gas and roll, sounds like it\'s winding down haha. And as always American Muscle was outstanding with how fast they shipped them.


            Helpful (5)

          • 5/5

            March 23, 2009


            go with ford racings gear(At least thats what my shop told me). These gears whine. It annoys me, if it doesnt annoy you then buy them. The 4.10 and the tune made the car so stupid fast. Just got my first ticket in them!!!! LOL. That\'s why i give the 4.10\'s a five star! Definitly needs to be first mod

            matt r.

            Helpful (5)

          • 5/5

            February 02, 2009

            Nice stuff

            Great product. Really noticeable with a new LCD. I love em! Get the Predator Diablo tuner to go with, it is awesome.


            Helpful (5)

          • 5/5

            August 15, 2008

            Plan First...

            These 4.10 gears from Motive were the third modification I had done to my GT. The difference in acceleration was very noticeable. One thing everyone warned me about was a drop in fuel efficiency, which I did not see. The gears allow the engine to operate at a more efficient speed, which won\'t really affect mileage if you keep your foot out of it. Another common misconception is a drop in \"top speed.\" That is totally false. Your top achievable speed will actually increase now that the engine will be operating at a slightly higher rpm. Sure, the top redline speed is lowered to 156, but unless you can run 8\'s in the 1/4 mile, you have nothing to worry about. These gears did have a little bit of whine, mostly heard when no load was placed on them (coasting). Unless you hear excessive whine (almost like a loud hum heard at all times), you have nothing to worry about. I recommend you give these gears a couple of heat/cool cycles before putting the pedal to the floor. That hardens them up. Lastly, plan things out before you get 4.10s. For an N/A Mustang, they provide a good increase in acceleration at the cost of 500 rpms. If you plan on supercharging your Mustang, I urge you to consider 3.73s. Overall these are a very good set of gears, and ideal for most Mustang owners. I recommend purchasing the differential bearing kit with these gears.

            Chris V

            Helpful (10)

          • 5/5

            August 04, 2008

            GREAT GEARS!



            Year: 2004 Submodel: GT

            Helpful (5)

          • 5/5

            June 05, 2008


            I had these installed last night and WOW! Well worth it.

            Scott Headley

            Helpful (4)

          • 5/5

            May 20, 2008

            Not bad

            Great price on the gears! They work well. Overall, worth it.

            Matt P.

            Helpful (4)

          • 5/5

            December 24, 2007

            love \'em

            i love them in my 03 gt 5 speed. very streetable and still average 18+ mpg when i try. its just too fun not to keep your foot off the pedal. the torque is great. so far ive been able to pull a 13.8 @ 101 on street tires (2.2 60\' time) and a mail order tune correct the spedo. great mod for you 2v mustang. will def. get these on my next mustang.

            Brandon James (PureStang)

            Year: 2003 Submodel: GT

            Helpful (5)

          • 5/5

            September 24, 2007


            Hands down one of the best mods you can do on a Non-PI mustang. All I can compair it to is, it feels like the car has a shot of nitrous. Once again has the best/fastest shipping times around!

            Matthew Brooks(red281gt)

            Helpful (5)

          • 5/5

            September 24, 2007

            4.10s + Auto = fast!

            I put these gears in my 04 GT auto when i still had it. Everyone told me that 4.10s were to big for a DD auto car. I can tell you they were wrong! these gears among other mods allowed me to go from 14.7s stock to a 13.61@103. also on the highway the RPMs were not bad at all to me. with the 4.10s and auto i still averaged 20MPG and even got a best of 24MPG on a road trip. DO NOT FEAR THE GEAR!!!!!!!!!!!!!!!!!!!!!! 4.10s will be going into my 07 GT as well

            Andy Shaffer

            Year: 2004 Submodel: GT

            Helpful (5)

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