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Ford Performance Ring Gear and Pinion Kit - 4.10 Gears (05-09 GT)

Market Price $189.99 You Save 11% ($20.02)
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  • Item 24002G05
  • MPN# M-4209-G410A

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Features, Video & Details

  • Ford Racing Quality
  • Strong Forged Construction
  • 4.10 Gear Ratio
  • 8.8" Ring Gear Diameter
  • For Street or Track Use
  • Fits 2005-2009 GT, Bullitt and GT500 Mustangs

Review & Installation Video

Review & Install Video

I’m Justin with, and this is our acceleration pack bolt on build up for all 05-09 Mustang GTs. This entire pack has been assembled with one goal in mind, to get our 07 GT off the line much faster. By addressing our gearing, and our grip, we’re actually going to lower our 60 foot times, and improve our overall acceleration, making the car a blast to drive in the process. But before we go over the list of parts we have to install today, let’s get our GT out of the ‘shop and onto the streets and do a baseline 0-60 run, just to see what we’re working with. Before we go installing our acceleration pack here on our 07 GT, we wanted to get the car out of the ‘shop and just do a baseline 0-60 run using our ITSX wireless tuner and my iPad, so there we go, start. Alright so it looks like we just clicked off a 5.5 second baseline run for our 0-60 time. Now we have that out of the way, let’s get our GT back in the shop so we can talk a little bit more about some of the parts we have in store for our GT, and see if we can’t knock that time down a little bit. First let’s talk about gearing, from the factory, our 07 GT came equipped with 3.55 gears, which are great for daily driving, but not the best for all out acceleration. That’s where these Ford Racing 4.10 gears come in, 4.10’s are totally going to wake up our GT off the line, and really give us that low end kick in the pants we’re looking for. That shorter gear ratio means we’ll be rolling through the gears a lot more than we would with our previous setup, so we need to make every shift count. We decided to go with the competition Billet Hurst shifter which it looks like the guys have already installed for us, this shifter should make for quicker, more precise shifts, which will lower our 0-60 time, and make for improved performance overall. Having all the power in the world doesn’t mean anything if you can’t put it down to the ground, and that’s where these next two parts come in. We decided to go with the Exedy Mach 350 Stage 1 clutch to handle the added drivetrain abuse, even though this is only a stage 1, this clutch has been rated to hold up to 450 ft/lbs of torque at the crank, which is more than enough to handle some bolt ons and then some. Besides being able to handle that extra power without breaking a sweat, the pedal feel in this car is only slightly firmer than stock, which won’t wear you out on long trips, or if you get stuck in traffic. Last but not least, we addressed that other very important G word – grip. We opted for BBK’s rear upper and lower control arm set, which should definitely help our GT hook up. Basically, these are going to reduce wheel hop, get us out of the hole a little better, and overall, lower our E.T.s. So now that you know what we have in store for our GT, let’s hand it over to the crew and get the rest of these parts installed, then get it out of the ‘shop and onto the streets so we can take it for a test spin, and do another 0-60 run and see what kind of improvements we made. Alright, so we’re in our 07 GT that we just got done working on, got our acceleration pack installed, and wow! I mean the car just goes now, every time you shift, you’re always in the power band. I love these 4.10’s, man, they’re a lot of fun to drive now. The shifter is working great, a little notchy, but some people like it some people don’t. I for one like it, it makes you feel like you’re actually in gear, kind of hard to miss a gear using this thing. As I was saying, those 3.55’s that the stock Mustang comes with, are probably good for daily driving, I take that back, these gears, the 4.10’s, you stomp on it and you’re going, there’s no downshifting for passing anymore, nothing like that. If it were up to me, I’d have 4.10’s in all of my cars. We haven’t really got to feel the difference that those BBK control arms made yet, just because I haven’t done any hard launches, however, we’re going to take our car back to the shop and do another 0-60 pull, to see if we improved on our time. Alright, now that we have the acceleration pack installed, we did a little driving, car feels great on the street, but now the true test, we’re going for the 0-60 time one more time, using my iPad and our ITSX wireless tuner. So here we go, start. Alright so we just clicked off our second 0-60 run in 5 seconds flat, that’s a half second improvement over our baseline time. Granted, our 07 Gt isn’t completely stock, we do have some basic bolt ons and a tune, but the general idea is just to show you how the acceleration pack is working, and clearly it’s working pretty good. So that does it for the acceleration pack for the 05-09 GT, be sure to check out some of our other bolt on build ups as well, where we dress up our GT a little bit, make it handle a little bit better, and pump up the power.

Improve ET's and low end torque. Are you looking to get more low end grunt off the line and lower ET's at the same time? Then look no further than installing a set of steeper gears in your Pony. Ford Racing Ring and Pinion Gears are perfect for street, road, or race use.

Superior Quality. These Ford Racing 4.10 Mustang ring and pinion gears feature a super strong forged construction, CNC cut & lapped gear teeth, and a black oxide finish to resist corrosion.

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 Ford Racing Ring and Pinion Gear set will fit all 2005 to 2010 V8 Mustangs including the GT, Bullitt and GT500 models. A master bearing kit is recommended by most installers, especially on high mileage vehicles, see drop down option above.

Attention 2010 and newer Mustang Owners. Starting in 2010 Ford changed the inner rear gear pinion bearing in all 8.8" equipped Mustangs. Because of this you will require a new 8.8" rear gear pinion bearing (Ford part# 9L3Z-4630-A) for proper installation, please 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: 2005 2006 2007 2008 2009 Details

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

Approximate RPM for 2005-2010 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 4071 5700        
2 2895 4054 5212 6370    
3 1947 2726 3505 4284 5063 5841
4 1264 1770 2276 2782 3287 3793
5 898 1257 1616 1975 2334 2693
Will it fit my Mustang?
  • Bullitt - 08, 09
  • GT - 05, 06, 07, 08, 09
  • GT500 - 07, 08, 09

People Who Bought This Item Also Bought

Most Helpful Reviews

4.10s #1 mod for an auto

I have an 06 gt stock. I picked up my car yesterday with the 4.10s and oh my God. The acceleration is wicked now. I don't have to mash the pedal to the floor for great acceleration any longer, wither. ...

Read More
Helpful (33)

bogging all gone!

do you have a automatic? are you tired of the sluggish throttle response off the line?Then these gears are perfect for you! For the money this is a very good option for making your mustang a lot more fun ...

Read More
Helpful (23)

Overall Rating 4.9 out of 5 stars
Read All 100+ Reviews

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20 Questions / 18 Answers

Ask a Question

55K mile car... first off, Id like to say that you guys have been the most personal, professional people to deal with, and thank you for that. Ive bought over 3000 dollars of parts from you over 2yrs and recommend you to everyone who askes where I get my parts. Enough said, my question is, Im almost ready to pull the trigger on purchasing 4.10's for my 06 GT and I am wondering, can I just buy the gears only at 179.00? instead of buying all the bearings and special gear oil? Im am very good friends with a ford dealer and have a tech that will do my gears, but I get different opinions from everyone whether I should replace bearings at such little milage on the car. I can get the ford gear oil that belongs in the car, but truely, how much more do I need to spend besides the purchase of the ring and pinion gears? Oh, and one more question, I drive mostly 0-65 on a daily and a few times a month I get on the highway and drive 75mph, and have 3.55's stock now, is 4.10's too low, or will they be a great match for my driving habbits? whats your opinion? I have already purchased a tuner and jlt cold air intake, with slp loudmouth exhaust, and am afraid that 3.73's wouldnt make such a big difference, thats why Im focused on 4.10's....


  • Thank you for thinking so highly of us! We love to hear positive feedback from our customers! You are correct in thinking that upgrading from 3.55 to 3.73 won't give you as much of an impact as you're after. You will definitely notice the get up and go of upgrading to the 4.10's over your stock 3.55s though! I would suggest sticking with the 4.10's; anything steeper and you would really start to see the effects on your gas mileage, etc.. Even if you were to start doing more highway driving with the 4.10's installed, you would not notice much of a decrease in mpg, which is always a good thing! In regards to the installation and bearing kit, I HIGHLY recommend you replace those as well. Cars with over 30,000 miles have bearings that are worn to the gears. Replacing all the worn out bearings, shims, etc... when installing new gears will prolong the life of your gears and will prevent any future problems. If a bearing goes bad down the road, you may end up having to replace the bearing and whatever else that bad bearing damaged as well. It's a great preventative measure for a potential giant headache. Changing your gears will also cause your speedometer to read incorrectly. If your have an automatic, it could also cause your shift points to be incorrect as well. Best way to correct that issue is to get a new custom tune for the car. If you have a tuner with AM/Bama, you have Free Tunes for Life and can just get the tune updated for the new gears. If you don't have a tuner, we do offer a kit that includes the gears, a handheld tuner, the rear end installation and bearing kit as well as the necessary gear oil to complete the job! I have attached the kit below if you'd like to take a look! I completely understand that $179.99 for gears along seems like the easier way to go about this upgrade, but if you want to do the job the best and most efficient way the first time around, I couldn't recommend the gear combo kit more! Any other questions, please give us a call! We'd be glad to help!


Show 3 more answers Helpful (3)

Will a100 shot of nitrous work well with 4.10s? My 06 gt is basically stock and was thinking about getting both. Will this harm the engine when nitrous is used because of 4.10s higher rpm?


  • cowboytriplets: Nitrous will work well with just about any gear ratio, it's been my experience that with 4:10 gears the tires want to bust loose when you use the shot right out of the hole. My advice is to look at getting a nitrous programmer that will ease into it down the track, otherwise you're gonna be melting tires off the line depending on your shot for example a 75 shot will probably be fine but a 150 shot is almost guranteed to bust them loose. Either way you're going to love the new found seat of pants power you'll feel from the 4:10's. Have fun buddy :)


Show 5 more answers Helpful (2)

Are 4.10's safe to use with the factory 2-piece driveshaft?


  • Lord yeah they are!! I drive mine daily, more closer to redline than normal, and they have held up tremendously to every bolt-on I have!!! Mines an 06 gt just 120k and the 4.10's are the best mod I have! Just get some soft-wide tires and you'll hook! Also the downside (for some people, I don't mind) is that going with a gear that large it will have a slight roar compared to factory! But install a loud exhaust or turn the music up and you're good!!!


Show 4 more answers Helpful (1)

Do I need the suggestions that go along with the gears, do other people buy them, what do they do , Is the installation easier, should I buy them


  • When installing the Ford Performance 4.10 Gears or any other rear gears, you will need, at minimum, a basic installation kit. However for higher mileage cars, we also recommend changing the bearings as well as preventative maintenance to avoid the labor of taking everything back apart if the bearings fail in the future.

    Rob D

Helpful (0)

Will these gears work well with my v6 mustang (2006)


  • These gears are not compatible with your 2006 V6 Mustang. Sorry!

    Doug P

Helpful (0)

After these are installed how do you fix the speedometer if you do not have a tuner? Will the speedometer always get messed up when installing new gears?


  • Hi, After changing the rear gears on a Mustang the MPH will be off the only other way to correct this is to use the Ford Performance Speedometer Recalibration Tool Item# 50139. Here is the link

    Chris J

Helpful (0)

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Customer Reviews (100+) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Weekend

Installation Cost:$250-$500

  • Performance Gain 4.732394 4.7
  • Fit 4.885714 4.9

  • 5/5

    April 20, 2011

    4.10s #1 mod for an auto

    I have an 06 gt stock. I picked up my car yesterday with the 4.10s and oh my God. The acceleration is wicked now. I don't have to mash the pedal to the floor for great acceleration any longer, wither. If you're worried about the higher rpm, don't be, the difference is minimal. And my gas mileage around the city is going up. You'll not find any mod in this price range that will come close to add the performance these gears will. Buy them! You'll thank me!


    Year: 2006 Submodel: GT

    Helpful (33)

  • 5/5

    April 01, 2011

    bogging all gone!

    do you have a automatic? are you tired of the sluggish throttle response off the line?Then these gears are perfect for you! For the money this is a very good option for making your mustang a lot more fun to drive. I hated how sluggish my mustang was out of the hole, but theses gears really wake up a automatic gt


    Year: 2005 Submodel: GT

    Helpful (23)

  • 5/5

    Installation Time: Full Day

    August 13, 2012

    Rude and Right

    I have installed these gears in my 09 GT 5 Speed. As always, 4:10's are the gear to have in one of these cars. 1st Gear just RIPS THE TIRES OFF THE RIMS, Second pulls like a FREIGHT TRAIN, then you have the other 3 gears for CRUSHING the COMPETION!!!! Combined with the JLT Cold Air Intake, Bama Tuner, Pypes X Pipe, and Pypes Pipe Bomb Catback Exhaust this car is DOWNRIGHT RUDE on the Street. What we have here is a 12 second 1/4 miler with A/C and a Shacker Sound System, totaly Street Legal, and 18 miles per gallon. How Cool is That!!!!?????


    Year: 2009 Submodel: GT Rochester NY

    Helpful (19)

  • 5/5

    July 01, 2010

    2008 GT/CS

    i have numerous bolt-ons but the 4.10's are by far my best investment. It wakes up your car when you want it to but isn's too much for a daily driver. The description claims to reduce your gas mileage but mine increased somehow, which makes no sense considering i accelerate a lot faster and a lot more often. I recommend having them installed by a shop. i have a buddy who is a mechanic and he had trouble doing some at his work and had to call over help. The highway driving isn't bad. The car will hum a lot louder on the highway but if you punch it'll throw you back. First gear is pretty powerful, Second is great, and once you hit third at full throttle you are happy you bought them! I strongly recommend these especially if you want to mess around with other mustangs because they just cant keep up once you have the new gears.

    Matt Stieg

    Year: 2008 Submodel: GT

    Helpful (18)

  • 5/5

    Installation Time: Full Day

    August 12, 2013

    Skeptical at first, now a believer

    I commute 70+ miles a day on fast SoCal freeways. I wanted more "fun" factor for my car. After all the usual bolt ons (90 mm CAI, 62mm TBI, CMC deletes, exhaust, shorty headers, cat delete, alum drivetrain, HotRod cams) I decided to lower the gears. I did the work myself- highly recommend dropping the whole rear end to work on if you don't have a lift. I found it much easier to work with the rear end on jack stands in the garage than upside down under the car, as there is a LOT of fitment and install details. I was afraid of the drop in mileage as commuting is a fact of life for me. I will say- I did drop 3+ mpg moving from my 3.55 to the 4.10---- with that said--- it was worth it to me. I still get around 21mpg average. We all got these cars not because they are the most practical. They are not the most fuel efficient. We got them because we wanted to have some fun along the way. We wanted to impress our friends, turn a few heads, and feel the rush of speed and torque. Our cars make horsepower, but at a higher rpm... We peak around 5800-- these gears help get you into the peak RPM band faster. I cruise at 80-ish mph commuting and engine sits at 2600 rpm. I used to be at 2100 rpm in my 3.55's. These gears have helped me beat my coworker's twin turbo'ed BMW. He was shocked when a few weeks ago he's pull me, but now, I can leave him, and my engine still has plenty of RPMs left. In short- if you remember to have fun, these gears are absolutely the way to go. In traffic, at speed, or in the city- these gears are fun! If you are more concerned about mileage- get a hybrid!


    Year: 2007 Submodel: Other San Diego, CA, USA

    Helpful (14)

  • 5/5

    Installation Time: Shop Install

    October 22, 2011

    Should have been the first mod!

    I wish i would have done this mod first, it really gets the stang up and moving. I feel like when i am driving down the road i am always at a perfect rpm. Sounds good driving 30 mph with my exhaust! You will for sure not regret them, I was up in the air with 3.73 vs 4.10 and i am positive i made the right decision! Going from a roll in 1, 2, or 3rd gear it gets up and scoots! I have CAI and full exhaust, with these i feel i get beat most cars! gas mileage? i have never calculated, because who can stay out of the gas pedal for a whole tank? GET THEM!


    Year: 2009 Submodel: GT Manhattan, KS

    Helpful (11)

  • 5/5

    September 09, 2010

    you light up my life

    just had the 410 gears installed on Tuesday, and they are awesome, I had 331 gears with a automatic transmission, and couldn't stand how pathetic it was out of the hole, what a difference the 410 gears are, I am so happy I decided to do this. If your on the fence I would go for it!


    Helpful (11)

  • 5/5

    June 12, 2009

    Dont FEAR the GEAR!!!!

    Wow great improvement from my stock 3.55 gears on my 06 GT... 4.10\'s are the BEST gear ever. Dont waste your money or time on 3.73 or 3.90\'s etc... Huge performance gained. Many people say 4.10 are too much gear for a manual... WELL they are WRONG. My rpms only increased 200 RPMs and 5th gear now allows me to drive at 60mph without bogging! Have a good shop INSTALL!!!! Costed 400 dollars to have them installed =( but it was way worth it!!!!! If you have a convertible id suggest 4.30\'s because of the weight. Thanks American Muscle


    Year: 2006 Submodel: GT

    Helpful (11)

  • 5/5

    December 08, 2008

    Get some Drag Radials

    Really improves acceleration 0-100. No more lag at the bottom of third and fourth gear. The car will top out now at 110 though and 5th is good for cruising, but will not pull hard once you have topped out 4th. Overall, great for in town racing and the strip, not good for high speed top-speed highway runs. It will also magnify any traction issues you are already having, so the drag radials are going on next!


    Helpful (10)

  • 5/5

    April 01, 2011


    Don't fear the gear... I had these installed in my 2006 GT and the difference is incredible. Better low-end throttle response, easier take-offs, better acceleration and so on. The RPM increase at highway speeds is modest at best. 2100RPM at 65MPH - hardly revving at all. If I had to do it over again I'd probably go with 4.30's! Stop thinking about it and buy them!!


    Year: 2006 Submodel: GT

    Helpful (8)

  • 5/5

    March 31, 2009


    Just had mine put on, big differnce when hitting the gas in first gear, u can break the tires with no clutch and when shifting to 2nd, break em again halfway through 2nd. Driving 40 mph roll and hitting the floor, you dont see a huge improvement, more from a dead stop... great purchase, glad i went with 4.10 over 3.73


    Helpful (8)

  • 4/5

    December 06, 2010

    Had both 3.73 and 4.10's

    Well to start off, these will def. help your acceleration. Im thinking I will go back to the 3.73's because top end is totally lost and at 70 im running 2500rpm+ with these and mpg was def. noticeable with these 4.10's, but they are fun in the city...there just not that great on the highway...probably helps also if you have a 6spd and not a 5 like mine. Cheers!


    Helpful (7)

  • 5/5

    December 01, 2008

    Love the 4.10s!

    These gears should have been the first thing I did to my 2005 GT. I paid just over $530 to have them installed at a Ford dealership. After almost 4,000 miles and having to suffer through the wrath of my right foot, these gears are holding up very well and make no noise other than a slight and pleasant hum, which is normal for steeper gears. I LOVE my 4.10s and I wouldnt go back to another gear, even if forced by gunpoint!

    A Girl.

    Year: 2005 Submodel: GT

    Helpful (7)

  • 5/5

    August 16, 2008

    Don't Fear the Gear

    Just as the title says. I was afraid at first to put such a steep gear into my daily driver (05 GT). After the install no regrets what-so-ever. 80 mph 3k, 70 mph 2600 rpm. This should be the very first mod to every mustang period. Thanks American Muscle!


    Year: 2005 Submodel: GT

    Helpful (7)

  • 4/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    January 08, 2013

    A little too steep for daily driver

    This is in a manual trans. These gears are great if you get on it every day, which I have done the 2 months after getting them installed. But now I have chilled out a bit and when your are trying to just casually drive around town they do suck. You have to shift a ton, and 1st gear in this car is already extremely steep so it just makes 1st that much shorter. On the highway with my o/r x pipe and pypes mid muffler I get the x pipe drone from 2500-3000. So I cant really even go faster than 70-75mph because the drone kills me. I'm N/A and I have zero traction in first with these and cannot floor it in 2nd either without losing the rear end. I would say if you have 3.55s just leave them they are great, you wont even be able to tell if you go to 3.73. If you have the 3.33s then go up to the 3.73s. And also you need to think about in the future if your going to get a supercharger. I will be getting a saleen twin screw down the road and putting my stock 3.55s back in once I get that. 4.10s would be way too steep for a twin screw. I would say 4.10s only for the track, or if you have cams, or if you get a centri like a vortech. With a 6500rpm limiter, 2nd ends at 60mph, 3rd at 90mph. 3rd used to end at 110mph. Keep your stock gears plz


    Year: 2006 Submodel: GT Derby, KS

    Helpful (6)

  • 5/5

    July 06, 2010

    2005 GT 5sp

    These offer a great "bang for the buck". They work great with a 5 speed, and are NOT too much gear. I did alot of research before pulling the trigger on these. Seems like there was always some bunk-hole saying "don't do 4.10's your top end will be 50mph and you will get 4mpg!" Hogwash. There is a 400 RPM increase in 5th gear @ 70mph over the stock 3.55's. Acceleration in ALL gears is improved. The car will now pull 5th much easier and is out of "drone" range while cruising. My MPG's around town/mixed driving improved by about 1mpg, while highway MPG dropped by about 1. You will need to have a handheld tuner to adjust the spedo for the new gears or else your spedo will be off. I had them installed at a shop for $300. When installed properly, these gears make NO noise. Ford really should make these an option in addition to 3.73's.


    Year: 2005 Submodel: GT

    Helpful (6)

  • 5/5

    September 01, 2009

    The 4.10's have it

    I have to agree with Zack from Denver. I did the same deal and wow- what a difference! The 4.10's pick up the front end and just wanna go. If you're on the fence with 3.73's, definitely do the 4.10's. I thought it would be too much gear but it's perfect

    '03 GT 5speed from Philly

    Helpful (5)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    February 10, 2013

    All new beast

    I put these on my '07 GT that originally had 3:31 gears in it. I completely suggest these gears to anyone fixing up a car. Nailing it in first just squats and spins and when I slam second it keeps going. But at the same time you are definitely accelerating faster than stock. It's just like Justin says on the video about these there is no need to downshift to pass anyone anymore, you are always in your power band. I bought the J&M lower control arms to go along with these but haven't had to time to install yet but I would suggest picking up a pair to help with traction off the line. If you're not 100% sure about these trust me when I say you won't regret them.


    Year: 2007 Submodel: GT

    Helpful (4)

  • 4/5

    August 08, 2011

    good, but not as great as they say

    went from a 3.55 to a 4.10, i could see how in an automatic, it would be a drastic change. i can feel it pull harder, but not as hard as you would think. really easy to install at a shop with a lift. took like 3 hours


    Year: 2008 Submodel: GT

    Helpful (4)

  • 5/5

    October 09, 2009


    GET THESE is all I can say about this. Awsome performance, very noticable with little effect on gas mileage. These gears are perfect for my 07 GT, go with these you wont regret it


    Helpful (4)

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