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Ford Performance Ring and Pinion Gear Kit - 4.10 Gear Ratio (99-04 GT)

Item 24002G99
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      Review & Installation Video

      I’m Justin with AmericanMuscle.com, and this is our acceleration pack bolt on build up for all 99-04 Mustang GTs. The focus of this pack is of course acceleration, but in order to accelerate faster you need traction, and lots of it. That’s why the majority of the parts used for our build today are focused on getting us off the line much quicker, ultimately resulting in faster acceleration. But before we go over all the parts we have in store for our 2000 GT here, let’s get it out of the shop and do a quick 0-60 baseline run, just to see where we stand now. Alright, before we go installing all of our parts for the acceleration pack, we’re going to do a baseline 0-60 run, using our iTSX wireless tuner and my iPad here, just to see where the car stands now, so hit start and here we go. Alright so it looks like we just clicked off a 6.66 0-60 time with our automatic 2000 GT, which is pretty average for this model car. Now we’re going to take our car back into the shop, talk a little bit more about some of the parts we have in store, and get them installed. Since traction is the theme of the day, what better way to get more of it, than by using a set of these NITTO NT555R Drag Radials, those large tread blocks paired with that real soft compound is going to give us a ton of grip both on the street and at the strip, and should really help our GT get off the line. To further help our GT hook we decided to go with some vital suspension components from QA1, starting with these box style rear lower control arms, these bars are a variation of the classic traction bar design, and basically help keep the rear axle from moving around under load, and especially on hard launches, eliminating any excessive wheel hop. We also decided to go with a set of these QA1 adjustable rear upper control arms, that are fully adjustable while still on the car. These are going to be key to adjusting our pinion angle which is not only important for traction, but also for driveline smoothness. These are really going to help firm up the rear end of the car, and eliminate any side to side sloppiness or wiggle, making the car track a lot straighter, and just making for an overall better driving experience. Moving away from our traction and getting into another big contributing factor to our acceleration, that’s right our gearing. From the factory, our automatic 2000 GT came with 3.27 gears, which is pretty weak for acceleration. That’s where these Ford Racing 4.10 gears come into play, simply put, that shorter gear ratio is going to help our car accelerate faster. Quite frankly, I’m quite anxious to see how it’s going to wake up our 2 valve motor. So now that you know what we have in store for our GT, we’re going to hand the car over to the crew and get everything installed, after they’re all done we’re going to take our GT back out on the street, just to see how it behaves on the road, and to see if we’ve improved on our 0-60 time. Alright so we’re out here on the street with our 2000 GT, we just had the acceleration pack installed by the guys back at the shop, and we’re just cruising, I mean the car is very mild mannered, we’re in overdrive, you’d never be able to tell there’s gears in the car, until you do a little squeeze on the throttle, and man does it go. It goes, it goes, and it hooks hard too. I mean we didn’t even have a chance to heat cycle the tires there and it just dead hooked on the street. Car is a little stiffer in the rear, that’s attributed to the stiffer bushings in both the QA1 lower and upper control arms, but that’s going to be a good thing, that’s going to help keep the car straight, going down the track, it’s also going to reduce our wheel hop as well, and overall just improve our acceleration. So now we’ve had the chance to drive the car around on the street a little bit, see how it reacts in everyday situations, we’re going to put it to the ultimate test, get it back to the shop, do a hard launch, and see if these parts work in lowering our 0-60 time. Alright, so we just finished up our second 0-60 run, and we just clicked off a 5.09 second 0-60, that’s over half a second off our baseline number, so it’s easy to see our acceleration pack is doing its job, and I’ve got to admit, those radials definitely helped us hook on the pavement. So that does it for the acceleration pack, be sure to check out our other 99-04 bolt on build ups where we make our GT handle a bit better, we give it some more power, and dress it up a little bit.

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation

      Features

      • Ford Racing Quality
      • Strong Forged Construction
      • 4.10 Gear Ratio
      • 8.8" Ring Gear Diameter
      • For Street or Track Use
      • Fits 1999-2004 GT, Bullitt, Mach 1 and Cobra Mustangs

      Description

      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 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# M-4209-88410

      CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

      5.0

      Customer Reviews (100+)

      Write a Review

      Ratings Summary

      5.0 out of 5 overall rating from 100+ customers

      Installation Time: Weekend

      Installation Cost: $250-$500





      • November 14, 2019

        5 2003 GT - Jay

        great purchased

        very durable, had for a year and never giving me any problems. gaines are obviously instant

        Helpful (0)
      • October 28, 2019

        5 2001 GT - Stangver Installation Time: Weekend

        Good Upgrade

        A good performance upgrade. Easy to install with the right tools and knowledge.

        Helpful (0)
      • July 22, 2019

        5 2004 GT - JuanG Installation Time: Weekend

        Performance Ring Gear

        The best mod you should have for 1999 to 2004 you can feel the different.

        Helpful (0)
      • May 06, 2019

        4 2000 GT - RichardS Installation Time: Afternoon

        Car came alive!!!

        I have a 2000 GT Roush w/ Auto and these gears made my car come alive. Very pleased with the product. Shipped and got to my house in 2 days. Can’t ask for anything else!

        Helpful (1)
      • January 27, 2019

        5 2004 GT - DannyO Installation Time: Weekend

        Gears destroy Fears

        Before gears, I use to be late for school and work, so I needed something that would change my life, maybe a newer car? Or just quitting life and resorting to living in the jungles of Texas. However, I prayed to the Mustang Monks that live on the temple of Muscle mountains, they bestowed me, “Sraeg,” Latin for Gears. Once installed, I would get to work and school early by 10 hours. I never felt such power since the install, I’m now a professional street car driver.

        Helpful (15)
      • January 17, 2019

        5 2003 GT - SB Installation Time: Shop Install

        4.10 review

        Good product. Cruising 70MPH with stock gearing runs about 1,900 RPM. 4.10’s at 70MPH runs about 2,400 RPM, so you’re looking at about a 500 RPM increase on the HWY/Interstate, etc. *Please note* This info was gathered using the 5-speed manual.

        Helpful (6)
      • November 08, 2018

        5 2004 GT - BrettS Installation Time: Afternoon

        Mygt

        Really woke my car up I have great acceleration from mid-range out of the hole off the line crazy crazy quick

        Helpful (4)
      • October 07, 2018

        5 2002 GT - AllenB Installation Time: Shop Install Installation Cost: $250-$500

        Ford Performance Parts

        Nothing to worry about, you know what your getting. 4.10 is a great choice for your automatic. Get’s up to speed much faster, chirps the tires, highway speeds are a blast. If your wondering in your auto 80mph is 3000rpm.

        Helpful (9)
      • April 04, 2018

        5 2004 GT - MustangDubai Installation Time: Afternoon

        4.10 THE BEST

        If you're looking to swap the rear end go for the 4.10 gear ratio. Also buy the installation kit and change everything at once

        Helpful (8)
      • February 05, 2018

        5 2003 GT - EzraG

        4.10 gears for my 03 gt manual

        Worth every single penny. If you are staying n/a 4.10s are the only way to go. Car chirps 3rd every time. Do not fear the gear. 5th gear on the highway is fine with 4.10s anything up to 80mph is still under 3k rpm. If you are going to supercharge your stang I'd drop to 3.73 so you can use the power band more. Overall any mustang n/a should have 4.10s. 2003 mustang gt 5 speed, 4.10 gears, tune, intake.

        Helpful (20)

      Questions & Answers (22 answers)

      5 Top Rated Questions

      Will this gear lower my top end speed? My car had 3.90 gears installed from the previous owner, and is crazy fast at accelerating from 0-112mph, but that is all it can do. The car doesn't go above that speed for some reason. I don't know if this is because of the gears or the differential as a whole, but if it is the gears, will tis lower the top end even more?

      • It will allow you to get there quicker and using 5th gear will probably keep your top end speed. Not knowing how strong your motor is 112 mph seems like something else is holding your speed down. Think about finding a chassis dyno and check it out for top end power.

      Helpful (4) Show 2 more answers

      i have a 2003 mustang gt and im debating between 3.73 and 4.10 gears. i do daily drive the car and it is on the highway often. would 4.10 be too much? would there still be a decent first gear left? please help its a hard decision.

      • If your car is a daily driver and is on the highway I would recommend getting the Ford Performance 3.73 Gears (99-04 GT). The 3.73 gears will be better for high way driving. http://www.americanmuscle.com/ford-373-9904gt.html

      Helpful (3)

      I’m going back and forth on these and the 3.73’s for my ‘01 GT convertible. I like the idea of better performance with the shorter gears but I’m also thinking about mpg. I would think with the heavier weight of the convertible even the 4.30’s would be best. I’m inexperienced in this area of expertise. Anyone with some experience on a convertible GT and changing to shorter gears and which is best?? Thank you!

      • Ultimately, changing the gear ratio is strictly a mechanical change. It will not directly affect performance or gas mileage in any way. Changing to a higher gear ratio will simply allow you to reach the top end of each gear quicker, effectively raising your 0-60. In theory, you can still drive exactly the same after this modification, and your mpgs won't be affected. However as you can imagine, if you can get from 0-60 quicker, you're going to have some fun. The act of taking advantage of this new ability to more quickly go from 0-60 is where you could see losses in mpgs, but again any loss in mpgs will be self inflicted.

      Helpful (2)

      Top Speed? I have a 2002 Mustang GT with a cold air intake and magnaflow exhaust. I currently have the stock 3:27 gears. With these gears I can run 70 mph in 2nd and 105 in 3rd "pushing it pretty hard". Over the summer I am wanting to put some new gears in the car and I'm trying to pick between 3:73 and 4:10's. I'm leaning toward the 4:10's, but I'm worried about my top end loss. I was wandering if anyone had any advice. That could help my decide. Also if you have any idea what my top end would be with either gear ratio, that would be helpful too.

      • Here's my take and I don't want to upset the Don't fear the gear guys however, my 2004 GT went from stock to 3.73 and all was good till I decided to go 4.10. Now I have to either shift from 1st to 2nd from a stop before I cross the intersection or start from 2nd. Is it quick? Yes, do I wish I should have stayed 3.73? Yes. My MPG lost 2mpg. My advice, if you want to haul azz out the hole every stop or live on the track then go for the 4.10! As for me, I miss my 3.73, however since it's not a daily driver I'll stay with the 4.10.....just get out of my way ; -))

      Helpful (2) Show 1 more answer

      Do I need the install kit? If i plan on having a shop install this do i need to spend the extra money on the install kit? Also how mush does it cost to have this installed at a shop? Thanks for the help.

      • Even at a shop it will be safer and less expensive if you buy the install kit. Ranges from $250-$300

      Helpful (1) Show 3 more answers
      10 More Questions
      what is the traction-lok rebuild kit and what is its purpose? 2 answers
      Will it improve automatics as well? Will the improvement gains on an automatic be the same or similar to those of a manual? Mine is an automatic and want to know whether it would be beneficial to upgrade gears or if there is a better way to go. 2 answers
      which gears would be better for my manual 2003 mustang gt? which gears would be better? I have read that the 4.10 gears are too much for a manual tranny 4 answers
      Do these come with a manufacturer warranty? 1 answer
      Do these come with a manufacturer warranty? Having a shop put them in that has done many gear rebuilds and they are having troubles because the gears aren't working right due to the teeth being machined wrong. 1 answer
      Does this come with a crush sleeve and pinion nut? 1 answer
      Do I need to get a handheld tuner for my car when installing these gears? I have a 2001 auto gt, cai, o/r x pipe and flow masters 1 answer
      I have a stock automatic mach 1, and im looking to get a better querter mile time at the track, with these will I see any difference? Thanks 1 answer
      I have a 2000 gt auto full exhaust/long tubes, x pipe slp lm Cai,78mm tb,24lb injectors,sct x4 custom dyno tune,stage 2 comp cams and resently I got a 2400 stall converter I'm trying to see what to go with either 3.73s or 4.10s 1 answer
      i'm thinking about going turbo in the near future. i have a automatic 2002 gt and i was wondering if it would be better to keep stock gears or go 3.73 or 4.10 1 answer

      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


      Manual
      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


      Automatic
      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

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

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