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B&M Finned Differential Cover; 8.8-Inch (11-14 V6; 86-14 V8, Excluding 03-04 Cobra & 13-14 GT500)

Item 100612
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      Product Information

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


      • Finned Design Dissipates Heat - Increases Gear Life
      • Light-Weight Cast Aluminum Construction
      • Magnetic Drain Plug Included
      • Features "B&M" Logo
      • Fits 1986-2014 8.8" Solid Axle Equipped Mustangs


      Stronger Than Stock. When upgrading the rear gears in your Mustang it's always a good idea to replace the wimpy stock differential cover with a super strong, light weight Aluminum Differential Cover for additional safety and peace of mind.

      Finned Aluminum Reduces Heat. Constructed from light-weight cast aluminum the B&M Mustang 8.8" Differential Cover features a finned design that dissipates heat much faster than the factory unit to prolong the life of your ring and pinion gears.

      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 Finned B&M Differential Cover is designed to fit the 1986-2014 Mustangs equipped with the 8.8" solid axle rear end, including the 2011-2014 V6, 1986-2014 GT, Bullitt, Mach 1, BOSS, Shelby GT500 and 1993-1998 SVT Cobra. It will not fit 1999-2004 Independent Rear Suspension (IRS) equipped SVT Cobras.

      Fitment: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 Details

      MPN# 40297

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (13)

      Write a Review

      Ratings Summary

      4.8 out of 5 overall rating from 13 customers

      Installation Time: Afternoon

      Installation Cost: 0-$100

      • March 08, 2020

        5 2006 GT - RacerX Installation Time: Weekend

        B M diff cover

        looks good----reason took weekend is to let silicone set for 24 hours before filling diff. about two hours to remove and install cover

        Helpful (0)
      • September 12, 2018

        2 2004 GT - Robert64 Installation Time: Afternoon

        B M Differential cover

        Looks like a quality product, but wouldn't fit my 2004 Saleen because it has a rear sway bar, and it hit the fins on the cover as soon as you lower the jacks and the sway bar tilts up. Went with Ford Racing diff. cover from American Muscle instead, and it works fine.

        Helpful (4)
      • August 11, 2018

        5 2011 GT - SamuelL Installation Time: Less than 1 Hour

        Very Nice

        I'm laughing so hard at the guy that left the review saying that he needed "8 quarts to fill this beast" LOL. And he is using Amsoil so that is an expensive lesson, and I'm sure the excess blew out of the axle-vent after driving and made a horrible mess. This BandM cover has a Drain hole and a Fill-Hole but the OEM Plug on the front of the axle housing has to be removed so that when fluid starts to run out of it then you know the differential is full. That is how you check the fluid level, you don't fill the axle all the way to the fill hole on the new BandM cover LOL. You'll need approx 1.2 more quarts w/BandM cover than with OEM cover.

        Helpful (7)
      • February 11, 2018

        5 1988 LX - MichelA Installation Time: Less than 1 Hour

        Great product!!

        This is a good looking and well made cover. I like the extra oil capacity for a cool running rear end. But most of all,the support to the main caps and quick to change rear end fluid without removing the cover! As always great service from American Muscle! Thank you!!

        Helpful (6)
      • October 10, 2017

        5 1991 LX - DanielZ Installation Time: Less than 1 Hour

        Quality product

        I knew as soon as I opened the package that this was a high quality piece. The carrier support bolts are a nice upgrade. Also nice to have the 1 quart increase in fluid capacity over the stock cover. Looks great as well. Installed this with a Swarr Bar on a Saturday morning and couldn't be happier!

        Helpful (5)
      • September 10, 2017

        5 2011 GT500 - ChristopherC Installation Time: Less than 1 Hour

        Works perfectly.

        Used this with a Lube Locker gasket and Amsoil gear oil with a friction modifier. Worked perfect. After a month, no leaks or noise. Diff cover looks great under the rear and supports offer a small piece of mind.

        Helpful (6)
      • March 13, 2017

        5 2004 Mach 1 - Rob Installation Time: Less than 1 Hour

        Great product!

        Looks amazing, fit perfectly, easy install, couldn't bee happier with this product.

        Helpful (6)
      • January 20, 2017

        5 2012 Boss - MNTrackrat Installation Time: Afternoon

        Hi Quality Part

        Looks great and fits great. I like the bearing supports, deep cooling fins, and fill and drain plugs. The only surprise is the added fluid capacity - a LOT more fluid than stock to help cooling. Plan on 8 quarts to fill this beast. At $20/qt, that's $160 of 75W 140 synthetic gear oil to finish the job!

        Helpful (8)
      • May 29, 2015

        5 2004 GT - DrewsWorld Installation Time: Less than 1 Hour

        04 Supercharged GT

        I purchased the cover as part of my gear upgrade to 3:73's. The cover was a perfect fit. The only thing I regret is not taking pictures of the finished product. My car is lowered so you can't see the cover.

        Helpful (7)
      • April 24, 2014

        5 2011 GT - TheBigA Installation Time: Afternoon

        Nice solid piece

        American muscle was great to deal with as always. Do a parts inventory before removing your stock cover! In my excitement to do the install I took off the stock pieces and prepped everything to go on, only to discover that B&M did not include the magnetic drain plug and the supplied washers were too big to fit into the machined holes in the cover. After I supplied my own hardware I will say its a beautiful piece and the bearing cap support bolts give me a little more piece of mind when hammering the throttle.

        Helpful (7)

      Questions & Answers (5 answers)

      5 Top Rated Questions

      I've got a stock 2005 GT and since I'll need to drop the axle and replace some pieces here and there I want to go ahead and replace the cover. With stock gears and using 75w-90 and ford racing friction mod. how much gear oil should I need total?

      I have a 488 gear and some brands hit the teeth of the lower geared cars with an 8.8. Specifically ,will this housing clear the 4.88 gears?

      Will this Diff cover fit an 97 cobra with an 8.8 running a 4.30 Ring and Pinion? Thanks

      • Hello, The B&M Finned Differential Cover Is designed to fit 1986-2014 Mustangs equipped with the 8.8" solid axle rear end, including the 2011-2014 V6, 1986-2014 GT, Bullitt, Mach 1, BOSS, Shelby GT500 and 1993-1998 SVT Cobra.

      Helpful (0)

      Would this cover fit while using a Fays2 style Watts-link? Specifically on a 2011 GT. Thanks.

      • Unfortunately we cannot guarantee fitment for this application. I would recommend contacting both manufacturers for measurements on these items to check fitment and compatibility.

      Helpful (0)

      How is clearance with the panhard bar on this? Specifically a 2008 GT with the Steeda adjustable bar.

      • See the clearance in my photo. I have a 2012 GT with LCA relo brackets and billet aluminum LCA from Steeda. I have barely any clearance but it works.

      Helpful (0) Show 1 more answer
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      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Axle Differential Cover
      • (1) Magnetic Drain Plug
      • (12) Bolts
      • (10) Washers
      • (2) Nuts

      Tech Specs

      Will It Fit My Mustang

      • Boss 302 - 12, 13
      • Bullitt - 01, 08, 09
      • Cobra - 93, 94, 95, 96, 97, 98
      • Cobra R - 93, 95, 00
      • GT - 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14
      • GT500 - 07, 08, 09, 10, 11, 12, 13, 14
      • LX - 87, 88, 89, 90, 91, 92, 93
      • Mach 1 - 03, 04
      • Other - 79, 80, 81, 82, 83, 84, 85, 86
      • V6 - 11, 12, 13, 14

      Fits Mustangs equipped with a 8.8" rear end only. Does not fit 1999-2004 IRS equipped Cobras

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