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Motive Performance Plus Ring Gear and Pinion Kit - 3.73 Gears (05-10 V6)

Market Price $257.99 You Save 12% ($30.51)
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  • Item 21107G05
  • MPN# F7.5-373

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    Features, Video & Details

    • Superior Quality
    • CNC-Cut from 8620 Gear Steel
    • 3.73 Gear Ratio
    • 7.5" Ring Gear Diameter
    • For Street or Track Use
    • Fits 2005-2010 V6 Mustangs

    Review & Installation Video

    Review & Install Video

    Improve Performance. Wake up your V6-powered pony for faster acceleration off the line with a set of 3.73 Motive Performance Plus gears. A steeper set of gears will get you into your power band faster for faster launches and more punch off the line.

    3.73 Gear Ratio. 3.73 gears are a great combination of performance and fuel economy that's ideal for a daily-driven 'Stang that sees a lot of highway time. If you put a lot of miles on your Pony and don't want to increase your cost at the pump, a 3.73 ratio will still give you the added acceleration you want without compromising fuel economy dramatically.

    Superior Construction. 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.

    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 Ring and Pinion Gear set will fit all 2005 to 2010 V6 Ford Mustangs equipped with a 7.5" rear end. 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: 2005 2006 2007 2008 2009 2010 Details

    CA Residents: Warning: California's Proposition 65

    What's in the Box
    • (1) Ring gear
    • (1) Pinion gear
    Installation Info
    Tech Specs
    Will it fit my Mustang?

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    Questions & Answers (6)

    5 Top Rated Questions

    I have a 2008 V-6 automatic and need to replace the rear. I was thinking of these gears. However, is a tune required or recommended?

    • The installation of the Motive Performance Plus Ring Gear and Pinion Kit - 3.73 Gears will require your speedometer to be recalibrated and this can be done with either a tuner or a speedometer recalibration tool.

    Helpful (2)

    I purchased the 3.73 gears and there was a noticeable difference in performance. I'm thinking about a 3000 torque converter. They are hard to find and pricey, is it worth the time, effort and expense....

    • A new and better torque converter would be a good buy if your car is running a higher stage cam. However if your cams are stock your stock torque converter would be just fine!

    Helpful (1) Show 1 more answer

    I drive a 2007 auto V6. Dual exhaust, BBK CAI and more to come. How bad do the 3.73 gears ruin gas mileage in city and highway driving at normal speeds? Obviously speeding/hard accelerating will make an impact, but what about just normal driving? Is there anything else to worry about with 3.73 gears? any potential hazards to the car or is it just gas mileage? Thanks in advance!

    • Hello! You will notice more of a decrease in mpg during highway driving. With higher mileage mustangs, it is recommended to add a bearing kit for installation. The gears will also throw off your speedometer, but ford racing has a re-calibration tool to fix it.

    Helpful (1)

    0-60 times What kind of 0-60 gains would a midly modded 2008 v6 (gms coil,taylor wires, NGK spark plugs, BBK cai, american thunder axleback, all without a tune-soon to come) see with these gears.

    • The stock specs are 0-60 mph : 6.6 sec.(manual), 6.9 sec.(auto). How much time the gears shave off depends on many variables. The driver, tires, temp, the gas, do you have a Posi-Traction Rear, do you have a tuner that has adjusted your shift points? It will make a big difference on how the car accelerates. I have the same set up in my car but I put a Posi-Traction Differential in and the hook up is awesome. Also if you are getting a Bama Tuner (I did) they can adjust your speedometer for the new gears. I was able to cut my 0-60 by 0.8 to 1.0 sec depending on the day with a Automatic Trans.

    Helpful (1)

    I had these 3.73 gears installed a week ago and am getting a LOT of gear whine. The shop that did the install is a driveline specialty shop with a good reputation. I called them to ask about the gear whine and they said, "That's normal for these aftermarket gears. It will probably die down over time." Is anyone else experiencing the same thing?

    • When installing new gears you will have a whining sound coming from them for the first few thousand miles until the gears are broken in. Within this period you will also want to do easy driving to break the gears in.

    Helpful (0)
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    Customer Reviews (23) Write a Review

    Overall Rating 4.7

    out of 5 stars

    Installation Time:Weekend

    Installation Cost:$250-$500

    • Performance Gain 4.428571 4.4
    • Fit 4.428571 4.4

    • 5/5

      Installation Time: Full Day

      May 05, 2018


      Loved it, there was a noticeable difference in performance...


      Year: 2006 Submodel: V6

      Helpful (0)

    • 4/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      July 09, 2017

      3.73 gear

      i did like this gave me a better hole shot out the gate.


      Year: 2007 Submodel: V6

      Helpful (1)

    • 5/5

      June 26, 2017

      Love it

      Made a big difference. would refer these to anyone


      Year: 2006 Submodel: V6

      Helpful (1)

    • 4/5

      Installation Time: Afternoon

      June 19, 2017

      Not what I expected

      "This will wake your pony up" is a bit overboard here. It didn't give me that I CAN'T LIFT MY HEAD FROM THE SEAT that I thought it would based on the reviews of these in comparison to the 4.10's. Also, noisy set of gears. I had them installed at a shop that specializes in rear ends, yes they were put in correctly with new bearings etc.. Just a sliiight whine when I'm light on the pedal that is annoying. Wish I read more reviews on the Motive and not just the product, seems they're almost always somewhat noisy.


      Year: 2005 Submodel: V6

      Helpful (1)

    • 5/5

      August 14, 2016


      Great gears. Worth the money. Def woke up my v6 . paired with it a new posi diff works Awsome. Drives like a v8 now. No more one wheel burn out . 2 wjeel burn outs for now on.


      Year: 2005 Submodel: V6

      Helpful (3)

    • 5/5

      July 25, 2016


      Totally different car, had them installed at the shop and right away you can feel the acceleration difference so happy with the purchase I would recommend getting a set!


      Year: 2007 Submodel: V6

      Helpful (3)

    • 2/5

      July 11, 2016

      Depth off smdh

      Great set of equipment had it installed in the shop do not have the tools to do overhaul jobs. The mechanic told me it was a big set they had to shave it down a bit put it in and was making a chattering even tho I used RP gear oil and friction modifier it chartered when coasting acceleration and deceleration I've taken it back before and they claimed they fixed it but it's still making so much noise smdh


      Year: 2008 Submodel: V6

      Helpful (2)

    • 4/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      October 05, 2012

      Motive 3.73 Gears

      Had these gears installed along with the T-LOK from FRPP at a local performance shop. After install the shop owner noted that although the gears were installed to spec, there is a whine when cruising at a constant speed, but not while accelerating or decelerating. It took some getting used to, especially on the freeway when it get very loud.


      Year: 2008 Submodel: V6 Los Angeles, CA

      Helpful (3)

    • 4/5

      Installation Time: Shop Install

      February 18, 2012

      Gear Upgrade

      I recently had Motive 3.73's put in my Stang along with a Ford Trac-Loc Posi. I took it to a shop being I didn't have the tools required to set the pinion depth. This is critical to avoid "Gear Whine", to deep or shallow and you will get noise on accell. or decell. On to the good part the gears they are top notch and fit great and are stronger than stock. After 500 miles break in they really surprised me. I have a whole different Mustang, rolling slow and punch it both tires break loose and a little sideways drift. From a dead stop it jumps like a cougar pouncing in for the kill, it has so much more "BALLS"!! And yes I have a automatic and the shift from 1st to 2nd chirps V-6. And that was without my Bama Tuner. Don't be tempted to get the 4:10's unless you plan to drag race every weekend you'll run out of wind up top showing who's who on the Interstate and Highways. GEARS SHOULD BE YOUR FIRST UP GRADE AND POSI IF YOU CAN SWING IT!! Hey and if I'm wrong I'll eat my hat!. The best MONEY I ever SPENT Hands Down, You won't be sorry, End Of Story!!!!


      Year: 2007 Submodel: V6

      Helpful (15)

    • 5/5

      Installation Time: Shop Install

      November 26, 2011

      Well worth the $!

      Great tiem. Well made. Must be professionally installed. These gears will really improve your off the line times and performance and won't affect your MPG much. My RPMs are only up slightly at highway speed. These gears bring your engine into its power band much quicker. A great investment! Motive gears were highly recommended by my mechanic...I'm glad I followed his advice! Use Royal Purple Limited Slip fluid with these.


      Year: 2008 Submodel: V6 MD

      Helpful (5)

    • 5/5

      March 16, 2011

      Motive Performance Plus 3.73 in V6

      Just had the Motive gears along with the Ford Racing T-lock differential installed in my 2005 Mustang. Had it professionally installed at Woodhouse Ford, and though I'm in the break in period yet, does seem to give the car definately more torque off the line. Would have been interested in the 4.10, but I do want to be able to drive it comfortably on the highway too... 3.73 seems a good compromise.

      K J Peters

      Year: 2005 Submodel: V6

      Helpful (2)

    • 4/5

      February 17, 2011

      Woke the pony up!

      This was a great product. Made my V6 really fly.. Only thing I didn't like is that it didn't come with and spacers or any of the bearings or crush collar that are pretty much mandatory. I wouldn't recommend doing rhis yourself unless you are a very experienced tech with a hoist. Don't count on finishing it in 1 day either. Took 2 buddies and I 2 7 hr. Days with a hoist. Very pleased with the product thus far. Just doin the 500 mile break in.

      Brad Coxe

      Helpful (2)

    • 5/5

      January 11, 2011

      big time must

      got this 3.73...came from factory 3.27...2000 v6 mustang 5sp... i only lost 300 rpms..65mph is now 2250 rpms..factory was 1950... definatly is a whole lot quicker getting into the "power band" also got the t-lok with thing i have done so far to this car..well other than getting the wireless tuner for it :) thanks AM !!

      justin p

      Year: 2000 Submodel: V6

      Helpful (2)

    • 5/5

      March 24, 2010


      373,perfect fit for my V6 The difference is much, now runs with more power with better acceleration THANK YOU AMERICAN MUSCLE


      Helpful (2)

    • 5/5

      February 19, 2010

      Great Mod

      Great mod albeit expensive with POSI, bearing kit and a $ 430 prof. installation. It was worth waiting and saving. It really gives a boost to your V6. After long search on Inet, AM provided the best prices for these parts.

      Fabian Hug

      Helpful (2)

    • 5/5

      November 03, 2009

      one word "awsome"

      put gears in,took just a few hours.Did the 500 mile break in.Now i race all over town! I love the new power.Thanks,American Muscle.Im glad i went with the 373,perfect fit for my daily driver!!

      colleen hartman

      Helpful (4)

    • 5/5

      May 29, 2009

      less slow!

      I had to rebuild the rear end of my mustang so I figured I would throw in some lower gears to get some more pep from my slow single port. I am very happy with the result, the acceleration is much better. The down side is that at 65mph im at 2500rpm (5spd). At least it keeps me from getting speeding tickets on the freeway.


      Helpful (3)

    • 5/5

      May 15, 2009

      A must!

      This product is a definite MUST a long with the T-lock to V6 enthusiasts! If you want more bang for your buck, then this is surely your item!


      Helpful (5)

    • 5/5

      November 18, 2008

      One beefy ring

      Got this along with my T lock. Talk about one solid piece of equipment!


      Helpful (2)

    • 5/5

      July 08, 2008


      I bought these gears along with the installation kit, and Royal Purple fluid. This really woke the car up. I do a lot of highway driving and noticed no change in noise or fuel economy. An SCT tuner will allow you to correct your speedometer and get some extra power at the same time.

      Ron B

      Helpful (6)

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