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#4115596 - 07/18/21 10:11 PM 94' Vic Differential Replacement
Isaiah_Romsdahl Offline
Stranger

Registered: 07/15/21
Posts: 8
Loc: NC
Hey guys,
I'm fairly new to the forum so please don't be upset if I went about asking this question the wrong way (via new topic)... However, I recently bought my first Vic, a 94' LX, and was wondering if there are any 4.56 LSD's I could find off another vehicle that would direct fit on my Vic. Its axle code is Y, which I believe means it's an open 3.08 diff. Any help would be awesome!


Edited by Isaiah_Romsdahl (07/18/21 10:45 PM)
_________________________
94' Crown Victoria LX
Estimated 65,000 original miles (odometer stopped working at 50,403, however original owner only drove it 8 miles a day)
04' Crown Victoria LX seats swapped

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#4115610 - 07/19/21 07:03 AM Re: 94' Vic Differential Replacement [Re: Isaiah_Romsdahl]
Old_Guy_Stu Offline

Over the Hill

Registered: 04/28/19
Posts: 2552
Loc: Cleveland, OH
Not if you're looking to swap the whole axle. You'll have to put new gears in your housing. Might want to think about upgrading to 31-spline axles while you're at it, as the higher ratio will put more stress on the shafts.

4.56 is a lot of gear. What's your plan here?
_________________________

1988 CVLX Formal Roof (Love Boat) POTM July 2019 & Aug 2020, 56K
E-code lights w/ relays, LEDs w/ switchbacks, 15x8 Ansen slots w/ 255/60 BFG's, Kenwood stereo, various hacks.

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#4115626 - 07/19/21 01:23 PM Re: 94' Vic Differential Replacement [Re: Old_Guy_Stu]
Isaiah_Romsdahl Offline
Stranger

Registered: 07/15/21
Posts: 8
Loc: NC
I'm not looking to swap the whole axle, just the differential. 4.56 is quite the jump, but I'm just looking to get a little better acceleration and getup from my car.
_________________________
94' Crown Victoria LX
Estimated 65,000 original miles (odometer stopped working at 50,403, however original owner only drove it 8 miles a day)
04' Crown Victoria LX seats swapped

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#4115632 - 07/19/21 02:43 PM Re: 94' Vic Differential Replacement [Re: Isaiah_Romsdahl]
RF_Overlord Offline

Poobah

Registered: 12/14/02
Posts: 7676
Loc: MA
You'll have more get-up-and-go for sure. You'll also find your fuel economy has got-up-and-went. biggrin

You'll also need a new speedometer drive gear to correct the speedo and the shift schedule, which will occur way too soon.
_________________________
'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen

'04 Grand Marquis LS Limited Edition (Spruce Green)
Daily Driver (Thanks, Adam!)

'00 Grand Marquis GS (Silver)
Rotted frame and broken transmission crossmember
Being resurrected...slowly.

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#4115648 - 07/19/21 06:17 PM Re: 94' Vic Differential Replacement [Re: Isaiah_Romsdahl]
ironmarinebill64 Offline
Rookie

Registered: 01/30/21
Posts: 54
Loc: New York, USA
I'd agree with the others' responses. 4.56 is too much for a street car absent major changes in tire size or wholesale swaps as to speedo and shift telemetry.

If you're at 3.08 now, a 3.27 or 3.45 would probably get you a little more revs at the line without having to change all the other stuff.

And this could also be done more easily if you find a salvage donor that has these ratios. Someone with more historical knowledge than I do, might be able to chime in if they were offered in any of the 92-97 models.

Speedometer reading will be slightly off if you went that route, but not so much as to be an issue.

Good luck brother!
_________________________
2005 Lincoln Town Car Signature Limited
5.4 liter throttle body; PI oil cooler, intake tube & air box; Mark VIII aluminum driveshaft; Trac-Lok limited slip; Richmond Gear axle shafts; J-Mod with Sonnax valves; Limo rear control arms and a great sounding stereo that won't ever automatically remember my Bluetooth settings

1999 Mercury Grand Marquis (gave that to youngest son, and he's now a converted true believer)

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#4115658 - 07/19/21 08:31 PM Re: 94' Vic Differential Replacement [Re: RF_Overlord]
Isaiah_Romsdahl Offline
Stranger

Registered: 07/15/21
Posts: 8
Loc: NC
That being said, do you have any suggestions as to other ratios/differentials I could find off a donor car that would swap easily into my 94?
_________________________
94' Crown Victoria LX
Estimated 65,000 original miles (odometer stopped working at 50,403, however original owner only drove it 8 miles a day)
04' Crown Victoria LX seats swapped

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#4115666 - 07/19/21 09:15 PM Re: 94' Vic Differential Replacement [Re: Isaiah_Romsdahl]
Old_Guy_Stu Offline

Over the Hill

Registered: 04/28/19
Posts: 2552
Loc: Cleveland, OH
It's not going to be an easy swap. This isn't a 9-inch with the removable pumpkin, so you'll have to set the endplay and mesh in your housing. If you don't know how to do that, you're gonna pay someone who does. It's not something you can just fudge, or trial-and-error til you get it right. It's not even all that easy to get the gears out of a donor car.

The 8.8 was used in damn near every RWD Ford, from Mustang to F-150, Ranger, Explorer, Crown Vic. So there's a jillion of 'em out there. For a higher ratio, look for a 4WD truck with big tires or a Mustang set up for drag racing.
_________________________

1988 CVLX Formal Roof (Love Boat) POTM July 2019 & Aug 2020, 56K
E-code lights w/ relays, LEDs w/ switchbacks, 15x8 Ansen slots w/ 255/60 BFG's, Kenwood stereo, various hacks.

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#4115674 - 07/19/21 10:20 PM Re: 94' Vic Differential Replacement [Re: Isaiah_Romsdahl]
RF_Overlord Offline

Poobah

Registered: 12/14/02
Posts: 7676
Loc: MA
As Stu said above, it's not easy. It's not terribly difficult, but if you've never swapped a R&P before, you should at the very least have someone with experience on hand to guide you. It's not really a beginner's job and I recommend you have a driveline shop do it. Ask around of the local Mustang club or 4WD guys.

Another consideration is called Driveline Critical Speed. The higher the gear ratio, the more harmonics you are going to get in the driveshaft. It's a matter of flex, not balance, and an aluminium driveshaft is really important if you want to drive at highway speeds for any length of time and not trash your tailshaft bushing and seal.

3.55 or *maybe* 3.73 is the highest ratio I would recommend for a street car without accompanying modifications.
_________________________
'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen

'04 Grand Marquis LS Limited Edition (Spruce Green)
Daily Driver (Thanks, Adam!)

'00 Grand Marquis GS (Silver)
Rotted frame and broken transmission crossmember
Being resurrected...slowly.

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#4115696 - 07/20/21 01:59 AM Re: 94' Vic Differential Replacement [Re: Old_Guy_Stu]
Isaiah_Romsdahl Offline
Stranger

Registered: 07/15/21
Posts: 8
Loc: NC
With that being said... I watched some YouTube videos and the whole thing does seem very time consuming... Would it be worth my while or any easier to just switch out rear ends entirely? I'm not a "quick fix" guy, and I genuinely want to do this the right way, I'm just curious if swapping rear ends might be better for my car as well.
_________________________
94' Crown Victoria LX
Estimated 65,000 original miles (odometer stopped working at 50,403, however original owner only drove it 8 miles a day)
04' Crown Victoria LX seats swapped

Top
#4115714 - 07/20/21 06:15 AM Re: 94' Vic Differential Replacement [Re: Isaiah_Romsdahl]
Old_Guy_Stu Offline

Over the Hill

Registered: 04/28/19
Posts: 2552
Loc: Cleveland, OH
You can simulate the change from 3.08 to 3.55 by mounting two donut spares on the rear and going for a drive. You speedo will be off by 10-15% but you're just testing for feel, see how you like it.

Swapping the whole axle is gonna be a lot less technical, but still a bunch of work. First you gotta find a 3.55 in the boneyard, so you'll look for a pre-'02 police car. Take the driveshaft, too. Then you'll either have to replace the brakes on it or swap your old ones over.

I assume you're doing this to improve acceleration? The change from 3.08 to 3.55 will be noticeable but not earth-shattering.
_________________________

1988 CVLX Formal Roof (Love Boat) POTM July 2019 & Aug 2020, 56K
E-code lights w/ relays, LEDs w/ switchbacks, 15x8 Ansen slots w/ 255/60 BFG's, Kenwood stereo, various hacks.

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#4115754 - 07/20/21 10:04 AM Re: 94' Vic Differential Replacement [Re: Old_Guy_Stu]
Isaiah_Romsdahl Offline
Stranger

Registered: 07/15/21
Posts: 8
Loc: NC
Yeah, I'd like some better acceleration, but also an LSD, as my car has an open diff right now. Last question, I promise! With a full rear end swap, could I put a 9 inch in, or would I have to keep it 8.8?


Edited by Isaiah_Romsdahl (07/20/21 10:34 AM)
_________________________
94' Crown Victoria LX
Estimated 65,000 original miles (odometer stopped working at 50,403, however original owner only drove it 8 miles a day)
04' Crown Victoria LX seats swapped

Top
#4115758 - 07/20/21 11:22 AM Re: 94' Vic Differential Replacement [Re: Isaiah_Romsdahl]
Old_Guy_Stu Offline

Over the Hill

Registered: 04/28/19
Posts: 2552
Loc: Cleveland, OH
Depends on your budget. Ford never put a 9-inch in the Panther, so you're looking at a custom aftermarket housing. Really, there's no need. The 8.8 is a beefy axle, good for about 700 HP.
_________________________

1988 CVLX Formal Roof (Love Boat) POTM July 2019 & Aug 2020, 56K
E-code lights w/ relays, LEDs w/ switchbacks, 15x8 Ansen slots w/ 255/60 BFG's, Kenwood stereo, various hacks.

Top
#4115770 - 07/20/21 01:18 PM Re: 94' Vic Differential Replacement [Re: Old_Guy_Stu]
Isaiah_Romsdahl Offline
Stranger

Registered: 07/15/21
Posts: 8
Loc: NC
Thanks so much man! I'll start looking!
_________________________
94' Crown Victoria LX
Estimated 65,000 original miles (odometer stopped working at 50,403, however original owner only drove it 8 miles a day)
04' Crown Victoria LX seats swapped

Top
#4120878 - 09/14/21 09:01 PM Re: 94' Vic Differential Replacement [Re: Old_Guy_Stu]
Isaiah_Romsdahl Offline
Stranger

Registered: 07/15/21
Posts: 8
Loc: NC
Found a rear end off an 02' Mustang GT that I am thinking will work. Will this be compatible?


Edited by Isaiah_Romsdahl (09/14/21 09:02 PM)
_________________________
94' Crown Victoria LX
Estimated 65,000 original miles (odometer stopped working at 50,403, however original owner only drove it 8 miles a day)
04' Crown Victoria LX seats swapped

Top
#4120914 - 09/15/21 07:12 AM Re: 94' Vic Differential Replacement [Re: Isaiah_Romsdahl]
Old_Guy_Stu Offline

Over the Hill

Registered: 04/28/19
Posts: 2552
Loc: Cleveland, OH
The gears, yes, but not the complete housing.
_________________________

1988 CVLX Formal Roof (Love Boat) POTM July 2019 & Aug 2020, 56K
E-code lights w/ relays, LEDs w/ switchbacks, 15x8 Ansen slots w/ 255/60 BFG's, Kenwood stereo, various hacks.

Top
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