GT Performance Mods 2005+ Mustang GT Performance and Technical Information

Boss/GT500 rear diff cover install

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Old 9/1/13, 09:17 AM
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Boss/GT500 rear diff cover install

For those that are interested in doing this mod, here's a photo of the parts. I moved the axle vent from the axle tube to the cover and capped off the axle tube hole. This solved my problem of getting gear lube all over the right hand axle tube and wheel. Cost me about $85 in parts.
Attached Thumbnails Boss/GT500 rear diff cover install-img_20130512_131407_819.jpg  
Old 9/1/13, 02:49 PM
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Dan, Perfect timing! Please let me know where you purchased that plug. I have all but that part to do the same modifications to my pony. Thanks so much.
Old 9/1/13, 02:52 PM
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Summit racing: http://www.summitracing.com/parts/fra-481404-bl
Old 9/1/13, 03:09 PM
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Fantastic! Thanks Dan!
Old 1/19/23, 12:51 PM
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Originally Posted by Jaden
For those that are interested in doing this mod, here's a photo of the parts. I moved the axle vent from the axle tube to the cover and capped off the axle tube hole. This solved my problem of getting gear lube all over the right hand axle tube and wheel. Cost me about $85 in parts.

In attempts to revive this a decade later… Did you find any way to plug the other two oil cooler ports at the bottom by the drain plug? I can’t find a fit to them. How can I tell if they have been drilled?
Old 1/19/23, 01:40 PM
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@Bcomf38

Originally Posted by Bcomf38
In attempts to revive this a decade later… Did you find any way to plug the other two oil cooler ports at the bottom by the drain plug? I can’t find a fit to them. How can I tell if they have been drilled?
I think the Specs you are Looking For are Listed Here!

If you Get a Cover From a Ford dealer it's a Bare Cover. The Ford Racing Version Looks to Come With Goodies!

https://performanceparts.ford.com/part/M-4033-KA
FORD RACING M-4033-KA

https://www.fordpartsgiant.com/parts...&filter=(39676)
OEM SERVICE {Bare COVER DR3Z-4033-B

https://www.fordpartsgiant.com/parts...9676)&pnc=4346
OEM AXLE COVER BOLTS {Spec Reference. Have to Buy 12 Because Pkg of 4}

https://www.fordpartsgiant.com/parts...rear_axle,,HM1
REPLACEMENT Cover Plugs Magnetic.

Although on a Ranger Some of the Install Info Can Be Gleened From this Link.

http://www.fordrangerforum.com/how-t...-8-8-rear.html

Scroll Down

KC

UNDRILLED COVER

Last edited by 05stangkc; 1/19/23 at 02:20 PM.
Old 1/19/23, 02:08 PM
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the finned diff cover that I installed on my car did not have any "oil cooler ports at the bottom near the drain plug" so I think the simple solution is to buy the one that does not have those, like KC suggested above

pretty sure I got mine from tascaparts.com and it cost about $80 (with no bolts) if I remember correctly
Old 1/19/23, 02:14 PM
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Originally Posted by Bert
the finned diff cover that I installed on my car did not have any "oil cooler ports at the bottom near the drain plug" so I think the simple solution is to buy the one that does not have those, like KC suggested above

pretty sure I got mine from tascaparts.com and it cost about $80 (with no bolts) if I remember correctly
Price Has Increased Dramatically These Days!

KC

Last edited by 05stangkc; 1/19/23 at 02:17 PM.
Old 2/10/23, 02:14 PM
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Originally Posted by Jaden
For those that are interested in doing this mod, here's a photo of the parts. I moved the axle vent from the axle tube to the cover and capped off the axle tube hole. This solved my problem of getting gear lube all over the right hand axle tube and wheel. Cost me about $85 in parts.
I realize I have purchased the correct cover. Curious what those ARP bolts are, I’ve heard stock ones don’t fit with this cover. Send me a link if and when you can
Old 2/10/23, 02:18 PM
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@Bcomf38

These are the Ones Shown in Post 1
https://www.summitracing.com/search/...651-1250%20arp

These are OEM Ford As Shown in Post 6
https://www.fordpartsgiant.com/parts...9676)&pnc=4346

Port Plug if You Need iT! As Shown in Post 1
https://www.summitracing.com/search?...yword=481404bl


Enjoy

Get Twelve!

KC

Last edited by 05stangkc; 2/10/23 at 02:36 PM.
Old 2/10/23, 02:19 PM
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I don't know the bolt size/thread off the top of my head, but you need the same thread as the stock bolts but about 1/4-3/8" longer for the thickness of the finned cover
Old 2/10/23, 02:37 PM
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Got it Covered. I was Still Editing While You Posted! Posts a Minute Apart!

KC

Last edited by 05stangkc; 2/10/23 at 08:23 PM.
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