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

AmericanMuscle no longer carries the SR Performance IRS Differential Cover - 8.8 in. (99-04 Cobra). Please check out 1999-2004 Mustang Limited Slip Differentials for an updated selection.
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Features & Details

  • Light Weight
  • Heat-Treated Aluminum
  • Increased Fluid Capacity
  • Upper Fill Port
  • Made in the USA
  • Fits 1999 to 2004 SVT Cobras w/ IRS
Lighter and Stronger. If you are upgrading the rear gears in your SVT Cobra, it's a good idea to replace your 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.

Superior Construction. Made in the USA, this 8.8" Rear End Differential Cover is cast from heat-treated aluminum for strength and features magnetic fill and drain plugs, additional clearance for billet main caps and low gear ratios, and increased fluid capacity for reduced operating temperatures.

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 SR Performance IRS Differential 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.

Note: Not compatible with Steeda Differential Cover Brace.

Fitment: 1999 2001 2003 2004 Details

MPN# 80011

CA Residents: WARNING: Cancer and Reproductive Harm -

What's in the Box
  • (1) Differential Cover
  • (10) Bolts
  • (10) Washers
  • (1) Hose Fitting
  • (1) Filtered Vent Fitting
Installation Info
Tech Specs
Will it fit my Mustang?

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Questions & Answers (1)

1 Top Rated Question

Does this come with the gasket? i been looking at your cobra irs differential covers and none say the gasket is included and it's needed for the install

  • The differential gaskets with an 8.8 inch rear will work. I would recommend looking at the installation kits, which have the gaskets. Item # 21203

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Customer Reviews (17) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Full Day

Installation Cost:$500-$1000

  • Performance Gain 5 5
  • Fit 4.75 4.8

  • 5/5

    May 26, 2018

    Good quality

    Good quality product definitely beefier than stock


    Year: 2004 Submodel: Cobra

    Helpful (4)

  • 5/5

    Installation Time: Less than 1 Hour

    November 07, 2017


    Nice! Everything works great until now. Also looks good.


    Year: 2004 Submodel: Cobra

    Helpful (6)

  • 5/5

    Installation Time: Afternoon

    May 22, 2015

    Awesome Upgrade!

    Great cover to upgrade to if you have a leak or cracked the cover. Very thick and durable cover!


    Year: 2004 Submodel: Cobra

    Helpful (6)

  • 5/5

    Installation Time: Afternoon

    December 28, 2014

    tough cover

    Really good looking cover a lot thicker than stock, good quality material drain plug easy to access it was a perfect fit good price happy with my purchase


    Year: 2003 Submodel: Cobra El Paso, TX, USA

    Helpful (7)

  • 4/5

    Installation Time: Weekend

    February 25, 2013

    Surdy piece, some fitment issues.

    This is a very sturdy part, extra thick at the mounting area. Slightly larger fluid capacity - holds about 2qt. The LPW logo protrudes a bit and impacted the rear mounting bracket cylinder that holds the bushing. I had to file down part of the logo. You cant see it anyway when installed. Might not happen with a Steeda mount. The drain and fill plugs are 2 diff size allen heads which is dumb and its impossible to use a rachet due to insufficient clearance. I should have replaced with 1/4 or 3/8in drive plugs. The plugs and carrier bearing bolts all have to be sealed or they will leak. Ultra grey RTV working so far...


    Year: 2003 Submodel: Cobra Leander, TX, USA

    Helpful (7)

  • 5/5

    Installation Time: Afternoon

    May 01, 2012

    Way stronger than the factory cover.

    I broke my factory cover and got lucky not damaging anything else. So i bought this cover and the Steeda cover brace at the same time. DO NOT BUY the Steeda cover brace. It WILL NOT FIT this diff cover because of the supports built into this cover. I called LPW and they told me that when using this cover, you do not need a brace. American Muscle gladly returned the Steeda brace and bought the rest of the Delran Bushings i needed.


    Year: 2001 Submodel: Cobra PA

    Helpful (7)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    April 30, 2012

    LPW Diff Cover

    No leaks as of yet. Poor directions; made my decision to have cover installed at shop a no brainer. Like the fact diff fluid can be changed without removing cover.


    Year: 2003 Submodel: Cobra Phoenix, AZ, USA

    Helpful (7)

  • 5/5

    Installation Time: Afternoon

    September 10, 2011

    This cover looks great and is superior over stock.

    great fit, I had to remove the pumpkin to have enough room to install, well worth the added strength and protection. Looks great .


    Year: 2003 Submodel: Cobra greensboro, N.C.

    Helpful (7)

  • 4/5

    August 22, 2011

    Irs cover

    Good looking piece easy to install while changing gears. Should come with cooling fins.


    Year: 1999 Submodel: Cobra

    Helpful (7)

  • 5/5

    August 11, 2011

    Buy it

    Buy it. it is a must have after you see the difference in thickness. Check out my few pics to give you an idea.


    Year: 2003 Submodel: Cobra

    Helpful (9)

  • 5/5

    May 06, 2011

    Great Cover

    Awesome product. However 3 quarts is too much oil. It was spilling out at the end of 2. Looks great and will hopefully not break!!


    Year: 2003 Submodel: Cobra

    Helpful (8)

  • 5/5

    February 13, 2011


    excellent part and price.broke mine on a 2nd to 3rd lucky no internal damage.have no problem since install.


    Helpful (7)

  • 5/5

    June 08, 2010


    Amazing piece!!! Thicker than stock and one thing nobody has hit on yet is the set screws to put pressure on the interior C brackets that hold the bearing in the sleeve! This is SOOOO important as if one of those break you have to buy a complete housing which is backordered from Ford until 2011! know this because mine broke - Luckily found one in a pick and pull - Hope this helps! A+ to buy this! It also has a drain plug and the factory ones dont


    Helpful (12)

  • 5/5

    February 19, 2010

    Nice casting

    This is a nice piece. Much thicker than stock.Have not road tested due to weather.


    Helpful (6)

  • 5/5

    January 09, 2010

    great piec

    great looking cover, looks very strong.


    Helpful (6)

  • 5/5

    September 21, 2009

    A must

    Installed this cover on my 03 Cobra a few months ago and its a very nice peice almost double the thickness of the stocker. Also took my car to the track and had zero issues.


    Year: 2003

    Helpful (9)

  • 5/5

    August 30, 2009


    A nice looking piece that is considerably stronger than stock.


    Helpful (9)

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