#4068656 - 06/25/20 01:41 PM
99-04 Mustang Rear End on '04 Crown Vic?
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Member
Registered: 08/16/19
Posts: 237
Loc: Charlotte, NC
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Hey y'all,
A guy in my area on Facebook Marketplace has a parts New Edge Mustang listed for sale. It's basically been parted out except for the wheels and the rear end, which is an 8.8 3.73 rear end. How hard would it be to put the rear on my '04 Crown Vic? It's currently sporting an open-diff 3.27.
Thanks.
Edited by YoungP71dude (06/25/20 01:49 PM)
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I give up on rewriting my signature. Please stop removing it, forum gods, it ain't that long.
I have an '04 P71 as my daily, another '04 P71 as my parts car/future race car project, an '86 LTD 2-Door I'm restoring, and my non-panther weekend car is an LS1 Camaro. So that's that.
Your only limit to modifying Panthers are your imagination, DIY skills, and wallet.
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#4068740 - 06/26/20 06:36 AM
Re: 99-04 Mustang Rear End on '04 Crown Vic?
[Re: YoungP71dude]
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Over the Hill
Registered: 09/02/02
Posts: 3493
Loc: Pennsylvania
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One thing to check is the condition of the clutches in that differential. Also if you change gears you'll need a tune. Otherwise the spedo and shifting will be off.
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2008 Ford Crown Victoria Police Interceptor P71 with street appearance package.
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#4068778 - 06/26/20 03:50 PM
Re: 99-04 Mustang Rear End on '04 Crown Vic?
[Re: ClayBelt]
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I know nothing
Posting Addict
Registered: 06/05/10
Posts: 19872
Loc: I can see Detroit from here!
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You can’t swap the rear axle assembly, but you can swap the gears and carrier into your rear axle assembly,y Yep. Only thing to watch is whether its a 28 or 31-spline carrier, not sure when the Mustangs changed. If its a 31-spline, you'll need new axles for it to work in your '04, but luckily enough '05.5+ Panther axle shafts are a direct swap for a '03-'04 and are 31-spline if need-be.
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-Steve  2006 Audi A6 ~132k miles, stock. 1998 Mercury Grand Marquis LS HPP ~100k miles, slowly acquiring modifications. 1997 Town Car Cartier ~145k miles, Ported Plenum, Gutted Airbox, Contour E-fan Retrofit, Dual exhaust with Magnaflows, cats deleted, MSD Ignition, KYB Gas-A-Justs, P71 front bar, air ride reinstated, Projector retrofit, Caddy 4-note horn retrofit, Wood rim steering wheel retrofit, holistic weight reduction as the parts fall off.. 1996 Mercury Grand Marquis GS 117,485mi. R.I.P. 7/14/12 
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#4068810 - 06/26/20 09:55 PM
Re: 99-04 Mustang Rear End on '04 Crown Vic?
[Re: BigMerc96]
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Member
Registered: 08/16/19
Posts: 237
Loc: Charlotte, NC
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Only thing to watch is whether its a 28 or 31-spline carrier, not sure when the Mustangs changed. If its a 31-spline, you'll need new axles for it to work in your '04, but luckily enough '05.5+ Panther axle shafts are a direct swap for a '03-'04 and are 31-spline if need-be. Looked it up, all Mustangs '79-04 are 28 spline axles. I'll see what the guy's asking for them, see the condition of the clutches, and if all checks out, that will be the first real mod to the Vic.
_________________________
I give up on rewriting my signature. Please stop removing it, forum gods, it ain't that long.
I have an '04 P71 as my daily, another '04 P71 as my parts car/future race car project, an '86 LTD 2-Door I'm restoring, and my non-panther weekend car is an LS1 Camaro. So that's that.
Your only limit to modifying Panthers are your imagination, DIY skills, and wallet.
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Top
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#4068850 - 06/27/20 08:53 AM
Re: 99-04 Mustang Rear End on '04 Crown Vic?
[Re: YoungP71dude]
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Over the Hill
Registered: 09/02/02
Posts: 3493
Loc: Pennsylvania
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03-04 mustang svt cobra diffs are 31 spline with carbon fiber clutches. I've got a brand new one in my 08. Be sure to check 28 or 31 people do swap them as well. That being said having limited slip is a great thing to have on these cars.
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2008 Ford Crown Victoria Police Interceptor P71 with street appearance package.
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#4068862 - 06/27/20 10:21 AM
Re: 99-04 Mustang Rear End on '04 Crown Vic?
[Re: 2008interceptor]
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Member
Registered: 08/16/19
Posts: 237
Loc: Charlotte, NC
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03-04 mustang svt cobra diffs are 31 spline with carbon fiber clutches. I've got a brand new one in my 08. Be sure to check 28 or 31 people do swap them as well. That being said having limited slip is a great thing to have on these cars. The car listed is a regular New Edge GT, so it should still work just fine.
_________________________
I give up on rewriting my signature. Please stop removing it, forum gods, it ain't that long.
I have an '04 P71 as my daily, another '04 P71 as my parts car/future race car project, an '86 LTD 2-Door I'm restoring, and my non-panther weekend car is an LS1 Camaro. So that's that.
Your only limit to modifying Panthers are your imagination, DIY skills, and wallet.
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