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

Item 100577
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Market Price $327.95 You Save 12% ($37.72)
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$290.23 (kit)

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      Review & Installation Video

      Product Information

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


      • 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.

      Fitment: 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009

      MPN# 100577

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (100+)

      Write a Review

      Ratings Summary

      4.9 out of 5 overall rating from 100+ customers

      Installation Time: Weekend

      Installation Cost: $250-$500

      • March 11, 2020

        5 2005 GT - Chris213cota Installation Time: Full Day

        2005 mustang gt

        Fits perfect you can feel the difference much more torque

        Helpful (0)
      • March 09, 2020

        5 2009 GT - DCRAIG10004 Installation Time: Full Day


        How heck!!! I never knew my 09 GT would be able to get off the line with sooo much torque!!!

        Helpful (0)
      • November 18, 2019

        5 1994 GT - Nopeitwasntme Installation Time: Full Day

        Great kit

        Was easy to install and having everything needed in one kit..made it alot easier..

        Helpful (0)
      • October 16, 2019

        5 2003 GT - AlanH Installation Time: Full Day

        Rear end upgrade

        Kit was complete easy to install approximately 4 to 6 hours. Came with royal purple synthetic gear lube nice touch

        Helpful (0)
      • October 02, 2019

        5 2006 GT - JulieA Installation Time: Full Day


        Took to my local muscle car shop and he did and amazing job. Took it for a 2 hour trip the next day and it was amazing on the hwy 70mph. I haven't noticed any gas drop and 1st gear is still usable. The shop said the gears fit and set up perfectly. I also changed my axle bearing seals and fixed a wheel sensor. I'm so happy I didn't get the 373 kit.

        Helpful (8)
      • August 14, 2019

        4 1997 Cobra - Bradysvt6


        Install went well. Gears make minimal noise deff best first mod for your money woke my 97 cobra up big time.

        Helpful (4)
      • May 29, 2019

        5 2006 GT - EdgarM Installation Time: Full Day


        I literally pop wheelies everywhere I go. Just slam the gas in first gear and off you go.

        Helpful (7)
      • May 12, 2019

        5 1996 GT - ShawnC Installation Time: Afternoon

        Good gear set up

        I really love them thank y’all so much I support y’all all the way good people

        Helpful (3)
      • May 07, 2019

        5 2004 GT - JerryK Installation Time: Shop Install Installation Cost: $250-$500

        04 gt geared up automatic

        very nice kit. took out the 3.27s and had the 4.10s installed. low end acceleration is 2 thumbs up. the car comes up on the powerband a lot faster. I used my sct tuner to calibrate the speedo. On the highway in overdrive the car does well. the flowmaster exhaust is screaming a lil bit from the higher rpm from the gear ratio. I love it

        Helpful (12)
      • May 02, 2019

        4 2001 GT - DerekK Installation Time: Afternoon

        Super cheap

        Perfect fitment. The only thing I did not like was the bolts that came with for the ring gear. They had a little bit of play sitting in there so I bought oem bolts. But other then that great product for the price!

        Helpful (3)

      Questions & Answers (44 answers)

      5 Top Rated Questions

      Should I get the Traction-LOK rebuild?? I have a 2007 mustang GT automatic with only 20k miles on it.. Do you think I need the traction-LOK rebuild kit.. PLEASE HELP I don't know what to do !!!!

      • Yes go ahead and get it. It will upgrade it the cobra and gt500 specs. The carbon discs hold up way more. And since I'm sure you'll be getting nasty with those 4.10s I'd go ahead and upgrade. You'll have to reuse your clip spring though the kit comes with a cobra spring. But yes go ahead and spend a little extra!

      Helpful (7) Show 2 more answers

      Real quick question, ordering these gears for my 97 cobra. Which gear tooth exactly will I need to fix my speedometer?? 97 cobra stock t45

      • For your 97 Cobra with 4.10's you would either need a 23t speedo gear, or you would need a 6 tooth drive gear used in conjunction with a 20t speedo gear. We do not offer and recommend against the 23t speedo gear, as they have a tendency to wear prematurely not seen in the lower tooth count gears.

      Helpful (6)

      will i have to update my tune through bama whenever i install these new gears? i have a bama tune and am wondering if i will have to email them requesting a tune upon installation.

      • Yes - for those with 1999+ V8 Mustangs, you will want to let our Bama team know that you have upgraded your gear ratio. They can add that to your tune information, which will correct your speedometer reading. Hope this helps!

      Helpful (3) Show 1 more answer

      is anything else needed to change gears

      • This would be a full kit and would not need anything else to do the swap. A tuner would be recommended to correct the speedometer but would not be needed for the install of the gears.

      Helpful (2)

      Do i really need the rebuilding loc kit? I have a 2001 ford Mustang gt convertible 5 speed with 97k miles I want to purchase the 4.10 install kit

      • The Ford Performance LOK kit is not required to do when swapping how gears, however, it would not be a bad idea to have everything changed to new when you are in and doing the gears.

      Helpful (2)
      10 More Questions
      can i use this oil ? car specifies 75-140 2 answers
      I like to replace my diff cover for an aftermarket one Which ones on your site Has clearance with the new gears set up so it doesn't run on them ? Or do all the covers will fit when looking for my yr 2007 s197?? 0 answer
      I have a 06 mustang gt manual and my rear end has a worn sound ..with this kit installed o was wondering if the rear end sound will stop 0 answer
      Why Does This Kit Not Fit 10-14? 0 answer
      I'm getting my 4.10 gears installed from a 3.37 in a weak and I've heard that you loose a bit of power spinning the 4.10 gears. Is this true or is it nonsense?. 0 answer
      I have a 1989 mustang 5.0.Will the 4.10 gears hurt the stock automatic transmission? 1 answer
      Do I have to have a tune with these gears? 1 answer
      Will this kit work on my 28 spline? 1 answer
      I have the iTSX tuner, if I get the gear kit can I correct the speedometer myself ? All ready have a tune installed . Do I HAVE to get a new tune? 06 gt automatic 1 answer
      Do I need to buy the full rebuild kit if Im buying a brand new differential to install these for 1 answer

      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

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