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Ford Performance IRS Differential Cover - 8.8 in. (99-04 Cobra)

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Market Price $298.31 You Save 12% ($34.32)
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$263.99

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  • Item 50383

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    Features & Details

    • Superior Strength
    • Light Weight Aluminum Construction
    • Includes Fill and Drain Plugs
    • Direct Fit Replacement
    • Fits 1999 to 2004 SVT Cobras w/ IRS
    Lighter and Stronger. When upgrading the rear gears in your SVT Cobra it's a good idea to replace that wimpy stock Girdle Support System (a.k.a. differential cover) with a super strong, light weight Aluminum Differential Cover for additional safety and peace of mind.

    Ford Racing Quaility. Add performance parts to your Pony made by the people who know it best. This Ford Racing 8.8" Rear End Differential Cover is cast from lightweight aluminum for strength and features convenient fill and drain plugs. The load bolts provide additional support for the differential bearing caps to increase ring and pinion gear life.

    Recommended Upgrade. When changing your differential cover it is recommended to upgrade to fresh Royal Purple Synthetic Gear Oil. You will need 3 quarts of Gear Oil.

    Application. This Ford Racing IRS Rear End Differential Girdle Cover is designed to fit the 1999 to 2004 SVT Cobras equipped with the 8.8" Independent Rear Suspension (IRS) rear end. not for use on non-IRS Mustangs.

    Fitment: 1999 2001 2003 2004 Details

    MPN# M-4033-G3

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

    What's in the Box
    • (1) Girdle cover
    • (10) Washers
    • (10) Bolts
    Installation Info
    Tech Specs
    Will it fit my Mustang?

      Customer Photos (5) Submit Your Photo

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        Questions & Answers (6)

        5 Top Rated Questions

        Will this work with the Steeda IRS differential brace? I know that the LPW will not work with the brace.

        • No, but if you use this cover you no longer need a diff brace.

        Helpful (1)

        Tapped hole for mech temp sensor? Are one of those holes a tapped hole for a mechanical temp sender? Jim Morrissey/ aka. Jimmysidecarr

        • No, the top hole is for a diff cooling system, the middle one is the fill hole and the bottom is the drain hole. On the inside of the cover they have a place marked on it where you can tap and drill your own temp sensor hole

        Helpful (1) Show 2 more answers

        Can install this with diff still in car?

        • This can be installed without removing the diff.

        Helpful (0)

        How much gear oil is meant to be used with this cover? Some people report 2.5 quarts is too much. The original cover calls for 1.5-2 quarts.

        • The Ford Performance IRS Differential Cover requires 3 quarts of gear oil.

        Helpful (0)

        Is this cover compatible with the FTBR 1401 delrin lowering mount?

        • The Ford Performance IRS Differential Cover is compatible with the FTBR 1401 Full Tilt Boogie Delrin Isolated IRS Differential Lowering Mount.

        Helpful (0)
        Post Your Question
        1 More Question
        What gasket was used for this cover? 1 answer

          Customer Reviews (28) Write a Review

          Overall Rating 4.8

          out of 5 stars

          Installation Time:Full Day

          Installation Cost:$250-$500

          • Performance Gain 4.36 4.4
          • Fit 5 5



          • 5/5

            Installation Time: Afternoon

            May 23, 2019

            Ford Performance IRS Diff Cover

            The differential cover is well made and much stronger than the OEM cover. It fit well and also had differential cap support bolts. I believe this will stop future differential cover leaks because I think the standard cover flexes under hard loads causing the leaks.

            Curt

            Year: 2003 Submodel: Cobra

            Helpful (0)

          • 5/5

            Installation Time: Full Day

            May 21, 2019

            Every Cobra IRS must have!

            Perfect solution to the weak cover. This and Delrin bushings are a must in an IRS. Wheel hop broke mine, mostly driver error on my part. Now I have some durability. I installed an diff cooler with the cover. This cover makes installing a diff cooler easier due to having accommodations for fittings.

            JeremyM

            Year: 2003 Submodel: Cobra

            Helpful (0)

          • 5/5

            Installation Time: Afternoon

            April 06, 2019

            Purpose and looks

            Fits, works, looks better and is stronger than stock, accommodates external cooler supports carrier bearings

            stvenkng

            Year: 2003 Submodel: Cobra

            Helpful (0)

          • 5/5

            Installation Time: Afternoon

            March 24, 2019

            Purpose and looks

            Fairly easy install, I was changing the gear to a Motive 3:90 so thought this would help strengthen the housing. Heavy built, oil cooler tube, fill and drain plugs, access for temp gauge. Worth the money, but might be a two man (or woman or X?,} job but you can knock it out in a couple of hours, three quarts of gear oil is a plus, runs cooler feels tighter.

            stvenkng

            Year: 2003 Submodel: Cobra

            Helpful (0)

          • 5/5

            Installation Time: Afternoon

            February 14, 2019

            Ford Performance Cobra Rear Diff. Cover IRS Cobra

            I haven't installed it yet but it is very well made and much stronger than the factory cover. It also has plugs for a oil cooler as well.

            CurtS

            Year: 2003 Submodel: Cobra

            Helpful (1)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            November 25, 2018

            Ford Performance IRS Diff Cover

            I got this as a replacement due to my stock one leaking. My cobra has 700hp to the wheels, its been a year with the new cover on and it's withheld many hard launches. Definitely would recommend to anyone.

            Francisco

            Year: 2004 Submodel: Cobra

            Helpful (3)

          • 5/5

            Installation Time: Less than 1 Hour

            August 31, 2018

            Super Strong IRS Diff Girdle

            Much thicker and obviously stronger than the original IRS cover. The original cover probably was good enough to contain the differential oil, but not the internal forces generated by a high HP engine. This will be installed on a FFR 535 HP Cobra Replica. Very easy to install since the IRS Differential was not yet installed on the FFR frame. No Mustang, but had to put a year in order to post the review!

            Tom

            Year: 2004 Submodel: Cobra

            Helpful (5)

          • 5/5

            Installation Time: Full Day

            June 03, 2018

            Nice piece great quality

            Really helps stiffen up your rear diff. A must have for IRS Cobras. Great craftsmanship. Even comes with all the hardware

            RichardJ

            Year: 2003 Submodel: Cobra

            Helpful (6)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            March 22, 2018

            Ford performance diff cover

            This is a very high quality cover , much thicker then stock one and much better looking. This cover should be a much stronger piece. I would recommend this product to all who are interested.

            JonF

            Year: 2003 Submodel: Cobra

            Helpful (6)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $500-$1000

            March 13, 2018

            Just what my Cobra needed.

            Like everyone has said, this thing is heavy duty and will probably outlast my life time. when the time comes to fix that leaky rear end diff, this is a must upgrade. Too bad it's not visible because it looks nice as well.

            shottsfired

            Year: 2003 Submodel: Cobra

            Helpful (7)

          • 5/5

            Installation Time: Afternoon

            February 01, 2018

            Better than wimpy stock cover

            This is a well built product. Much better than the wimpy stock diff cover. I have much more confidence now with this well built replacement. Had this installed when I replaced my stock gears with new Ford Racing 4.10.

            BrianA

            Year: 1999 Submodel: Cobra

            Helpful (7)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            December 29, 2017

            Great Cover

            For the value you can’t go wrong, eventually your oem cover will fail this in my opinion is the best upgrade. Great fit and finish. Just recommend you get the better upgraded bolts as well.

            MarcoB

            Year: 2004 Submodel: Cobra

            Helpful (7)

          • 4/5

            Installation Time: Afternoon

            December 18, 2017

            Diff cover

            You honestly don't have to take the whole rear end put it took about 3 hours but it was on a stand worth buying for the price you pay

            RubenF

            Year: 2003 Submodel: Cobra

            Helpful (7)

          • 2/5

            Installation Time: Full Day

            June 23, 2017

            Mineral Grey 03 Cobra

            Highly recommended, fits great and looks better. It took awhile to install, I had to remove the rear diff pumpkin completely out of the car. Once on the bench it took 20 minutes to put the new cover on.

            FredK

            Year: 2003 Submodel: Cobra

            Helpful (7)

          • 5/5

            Installation Time: Full Day

            May 25, 2017

            Strong cover..

            Great looking cover, fits great and not to bad to install if you're familiar with removing the IRS. Worth the money!!

            RobertH

            Year: 2003 Submodel: Cobra

            Helpful (8)

          • 5/5

            Installation Time: Afternoon

            May 16, 2017

            Beefy

            This FRPP diff cover is about twice as thick as the stock piece, with plenty of reinforcement. With the included drain plug, changing diff oil will be easy and it comes ready to hook up to a diff cooler if you need one.

            ZachS

            Year: 2004 Submodel: Cobra

            Helpful (7)

          • 5/5

            August 08, 2016

            03 Cobra IRS Differential

            I had to replace my stock Differential cover and am glad I chose the Ford Racing cover. There is a huge difference from the stock to the Ford Racing. You can tell the Ford Racing diff cover is built to withstand high horsepower while the stock is just a puny cover. Glad I upgraded. No leaks from the new.

            Jonathan

            Year: 2003 Submodel: Cobra

            Helpful (9)

          • 5/5

            Installation Time: Full Day

            May 29, 2015

            Ford Racing IRS cover

            The entire rear end has to be disassembled, and differential has to come down in order for it to fit, you will also need an extra person put it in. Ensure you put the right amount of fluid in, I made the mistake of putting in 2.5 quarts and once pressurized it throws it back out through the vent tube. Overall I love the look, fit, and the peace of mind that your cover won't crack that easily on a hard launch.

            Aldo

            Year: 2003 Submodel: Cobra Palmdale, CA

            Helpful (8)

          • 5/5

            Installation Time: Afternoon

            May 29, 2015

            Great product a must for IRS

            Installed a billet flow IRS brace and 2 years later the thin stock cover had a leak that I noticed over the winter. Since I had to take it apart I went ahead and did the new ford racing differential cover and bushings. American muscle had the best price and offer a military discount which I very much appreciate. Free shipping just can't go wrong.

            Joe

            Year: 2004 Submodel: Cobra Franklin, OH

            Helpful (8)

          • 5/5

            Installation Time: Afternoon

            August 22, 2014

            Much stronger than stock

            This differential cover is much thicker and stronger than the weak stock cover. This product has gave me peace of mind that I won't break a cover during hard launches.

            Terminated150

            Year: 2003 Submodel: Cobra Minneapolis, MN, USA

            Helpful (8)

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