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Ford Performance 4.10 Gears and Install Kit (86-09 V8 Mustang)

Item 100577
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$290.23 (kit)

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      Video Review & Installation

      If you're looking to totally transform your '86 to '09 V8-powered Mustang but without adding anymore horsepower, well then switching to a 4.10 gear ratio might just be the best way to do so. Now, the kit that we have here will fit the 8.8 solid rear axle and will include the brand new ring and pinion, along with everything you need to get them in place. Price point for the 5-star rated kit will be in the mid to high $200 range while the install will not be for the novice mechanics out there so let's call this one a full 3 out of 3 wrenches on the difficulty meter with a little bit more detail on that later in the video.So I guess you could say it's really no secret that the factory gear ratios for most earlier Mustangs like the Fox Bodies and the SN95s, and even some of the early S197s weren't exactly ideal for scorching acceleration off the line. In fact, it was quite the opposite. Now most of these earlier cars were either working with a 2.73, a 3.08, or in some cases, a 3.27 and that was pretty much it until the later S197s ushered in the optional 3.55 gear ratio. Now, with all that said, a great way to increase your off-the-line acceleration and performance but without even touching the engine is to install a numerically-higher gear ratio or a "shorter gear" as it's sometimes described. Now, shorter gear ratios will help get you up to speed a little bit faster and through those gears much quicker, with the only drawback being a hit to your fuel economy but with the days of overdrive transmissions, it's not nearly as bad as it used to be with the old four-speed stuff.But getting into the kit that we do have here on the table today, and again, the 4.10 ratio and in my opinion the most popular option we have on the site in regards to ratios because it's going to give you the most performance or bang for your buck compared to your factory ratio. But, at the same time, it's not gonna be completely ridiculous for the street like a 4.56, a 4.88, or something even higher. But as far as the physical construction of the gears are concerned, well, really nice stuff from the gang over at Ford Performance as you might expect, including the strong forged construction, CNC cut along with the lapped teeth, all finished off in this black oxide finish. Now, the gears have been made in the USA and Ford Performance claims they're gonna be the quietest gear set available for the 8.8 rear end. But, on the subject of noise, a lot of times with a gear change, any noise that you might encounter might not always be from the actual gears themselves but rather the install or the setup of the gears in your rear end.So that leads us to our next part of this product and that is the installation kit. This thing is also from Ford Performance and while we don't have every single part on the table with me here for this video, it does include everything you guys need to get the new ring and pinion set up and installed in your 8.8 properly. This does include brand new bearings, brand new seals, shims, crush sleeves, pinion nuts, gear marking compound, and brush to check your pattern and depth, your diff cover gasket, and even 2 quarts here of the Royal Purple 75-90 gear oil in addition to the 4 ounce or 3.8 ounce bottle of the required friction modifier. So basically, guys, a very complete kit and one that will be very beneficial to either you or your mechanic when it comes time to get everything in place.But, speaking of getting everything in place, and listen, gear installs and setups can be a bit of an art form to get them in place but also to have them operate quietly so therefore, we're gonna knock this one up to a three out of three wrenches on the old difficulty meter here. It's a fair amount of work and it's going to involve some specialty tools. So again, if you're not really comfortable with this one, guys, you might wanna get it knocked out by your local shop instead. On the other hand, if you've done a few of these before, you know what to expect, you know what kind of specialty tools you'll need, and you're certainly gonna save yourself some labor and some money when it comes to the install.As always, gang, whenever you knock out a gear change like this, your calibration or your speedometer calibration will need to be addressed, otherwise it will be off, more so if you make a drastic change to your rear end gears, like in this case, switching from a 2.73 to a 4.10. Now if you have a '79 to '98 V8 Mustang, you can simply replace the speedometer gear. It's gonna be the most cost effective and probably easiest way to do this. '99 and newer owners out there with the vehicle speed sensors, you can either change this through a handheld tuning device or you can even look into a speedo recalibration box from Ford Performance. You can find one of those here on the site for your ride for around a couple hundred bucks.But wrapping things up, if you're looking to really kick things up off the line and improve your acceleration and lower some ETs, a set of 4.10s from Ford Performance would be an excellent choice and you can grab yours right here at

      Product Information

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

      Features & Specs

      • Money Saving Combo Kit
      • Ford Racing 4.10 Gears - 8.8"
      • Motive 8.8" Rear End Installation and Bearing Kit
      • 1 Bottle of Ford Racing Friction Modifier
      • 2 Quarts of Royal Purple Max Gear 75w90 Gear Oil
      • Fits 1986-2009 V8 with 8.8" Solid Rear Axle


      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. This Ford Racing Ring and Pinion Gears are perfect for street, road, or race use.

      Complete Kit. This Ford Racing Gear and Installation Kit comes complete with all the components needed to swap out your ring and pinion gear. It includes Ring gear, Pinion gear, 1 bottle of Friction Modifier, 2 bottles of 75w90 Gear Oil, gaskets, seals, shims, bearings and all the required hardware.

      Legendary Ford Racing Quality. When you're adding performance parts to your Pony, you can't go wrong by installing parts from the folks that know it best. Ford Racing's legendary quality ensures years of hassle-free use.

      Recommended Upgrade. Changing the rear axle gear ratio will throw off the calibration of your Mustangs speedometer, but a Speedometer Gear, a Ford Racing Speedometer Recalibration Tool or a Bama SF4/X4 Power Flash Tuner is a quick and easy way to fix this issue.

      Application. This Ford Racing 4.10 Rear Gear and Installation Kit is designed for use with 8.8in solid rear axle equipped Mustangs, including the 1986-2009 GT, Bullitt, Mach 1, Shelby GT500 and 1994-1998 SVT Cobra. It will not fit the 1999-2004 IRS equipped Cobra Mustangs.

      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.



      Ford Performance 100577

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Ring gear
      • (1) Pinion gear
      • (1) 3.8 fluid oz bottle of Friction Modifier
      • (2) one quart bottle of Royal Purple Max Gear 75w90 Gear Oil
      • Front & Rear Pinion Bearing
      • Pinion Seal
      • Carrier Bearings
      • Carrier Shims
      • Differential Bearings
      • Crush Sleeve
      • Pinion Nut
      • Cover Gasket
      • Ring Gear Bolts
      • Brush
      • Gear Marking Compound
      • Loctite

      Customer Reviews (225)

        Questions & Answers

        10 More Questions

        Will It Fit My Mustang

        • Bullitt - 01, 08, 09
        • Cobra - 93, 94, 95, 96, 97, 98, 99, 01, 03, 04
        • Cobra R - 93, 95
        • GT - 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09
        • GT500 - 07, 08, 09
        • LX - 87, 88, 89, 90, 91, 92, 93
        • Mach 1 - 03, 04
        • Other - 86

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