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

Market Price $304.99 You Save 13% ($40.02)
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  • Item 50383
  • MPN# M-4033-G3

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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

What's in the Box
  • (1) Girdle cover
  • (10) Washers
  • (10) Bolts
Installation Info
Will it fit my Mustang?
  • Cobra - 99, 01, 03, 04

Fits 1999-2004 IRS equipped Cobras Only

People Who Bought This Item Also Bought

Most Helpful Reviews

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 ...

Read More
Helpful (1)

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.

Helpful (1)

Overall Rating 4.9 out of 5 stars
Read All 13 Reviews

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2 Questions / 4 Answers

Ask a Question

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


Show 2 more answers Helpful (1)

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 (0)

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Customer Reviews (13) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Full Day

Installation Cost:$500-$1000

  • Performance Gain 4.8 4.8
  • Fit 5 5

  • 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.


    Year: 2003 Submodel: Cobra

    Helpful (1)

  • 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.


    Year: 2003 Submodel: Cobra Minneapolis, MN, USA

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    November 09, 2012

    Ford Racing 8.8 03 Cobra Diff Cover

    I recently purchased this newly designed diff cover for my 03 cobra to replace the stocker along with my added billet flow irs brace. This is truly a very nice piece and the fit is perfect. In fact, this is what ford should have designed and installed on the car 9 years ago! The installation took about 5-6 hours on the irs because you have to tilt the sub-frame out of the car to remove the pumpkin to put the new cover on (you can not install in place). I used a lube locker gasket and some nice RP synthetic gear oil to put it all back together. All and All I highly recommend this cover for all cobra owners even though the work required to install is high.


    Year: 2003 Submodel: Cobra Matawan, NJ, USA

    Helpful (2)

  • 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.


    Year: 2004 Submodel: Cobra Franklin, OH

    Helpful (1)

  • 4/5

    Installation Time: Weekend

    June 25, 2014

    Should have come from the factory like this

    IRS brace or a beefier cover (such as this one) is absolutely necessary for the IRS cobras as the weak stock unit has a tendancy to break open during the jerky motion of wheel hop. The drain plug and cooler plug is an added bonus. Be ready to spend some time with this install. At least one full day of work if you've never disassembled the IRS before. My only complaint is that the machined mating surface had suffered some damage in transit. Could have been packaged better.


    Year: 2004 Submodel: Cobra Toronto,On

    Helpful (1)

  • 5/5

    Installation Time: Full Day

    March 22, 2013

    Ford IRS Differential Cover

    I blew the differential seal at the dragstrip last year.I noticed a little bit if oil on the floor while the car was stored over the winter.I decided to upgrade the wimpy stock diff cover with the Ford Racing one.Very nice quality and fit.I like the fact that there is a drain plug in the cover.Highly recommended!!!


    Year: 2003 Submodel: Cobra Winnipeg,Canada

    Helpful (1)

  • 5/5

    January 18, 2013

    Ford Racing Diff Cover

    I got my Ford Racing Cover the day after I ordered it as always from AM . It is a solid piece no doubt . Will be installing it over the winter . I have no doubt what so ever it will fit perfect . I know for fact it will look awesome .More importantly it will be very strong to handle some good RWHP. Thanks AM !


    Year: 2003 Submodel: Cobra Wilm .DE

    Helpful (1)

  • 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.


    Year: 2003 Submodel: Cobra Palmdale, CA

    Helpful (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    March 29, 2014

    Worth it

    Bought this cover to complete my diff rebuild. Huge upgrade over stock. I feel the cost is a little high for the part,but after installing it,I quickly forgot about that lol.


    Year: 2001 Submodel: Cobra Nj

    Helpful (0)

  • 5/5

    Installation Time: Full Day

    September 21, 2013

    Extremely HD diff monunt perch over stock cover

    Extremely HD over stock cover. Preload bolts for caps & provisions for external oil cooler circuit! Nive product.


    Year: 1999 Submodel: Cobra MA

    Helpful (0)

  • 5/5

    Installation Time: Weekend

    November 11, 2012

    Diff cover swap

    My cobra was leaking differential fluid so I put a Billetflow irs brace on it and it continued to leak so I put the ford racing cover on and it hasn't dripped since. Amazing product


    Year: 2003 Submodel: Cobra Paoli, PA, USA

    Helpful (0)

  • 5/5

    Installation Time: Less than 1 Hour

    November 09, 2012

    ford racing differential cover

    You can see the quality difference from the stock cover just by looking at it, I feel great about upgrading to this cover. The cover even comes with the longer bolts you'll need since this one is so much thicker than the original. It was an easy install but we had the differential out of the car I would imagine it would be a little more difficult getting the thicker cover in and out if we tried to do it with the differential still on the car, but aside from that it's a great product and I'm extremely pleased with it.


    Year: 2001 Submodel: Cobra

    Helpful (0)

  • 5/5

    Installation Time: Afternoon

    May 16, 2017


    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.


    Year: 2004 Submodel: Cobra

    Helpful (0)

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