#4120958 - 09/15/21 02:08 PM
Re: 94' Vic Differential Replacement
[Re: Isaiah_Romsdahl]
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n00b
Registered: 07/15/21
Posts: 11
Loc: NC
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What about the housing is incompatible? From what I've read, they are both 8.8 rear ends, the only difference being the mustang is a 31 spline 3.55 lsd, and my current diff is a 28 spline 3.08 open diff. Shouldn't I be able to take my rear end off and put the mustang rear end right on?
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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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#4120960 - 09/15/21 02:12 PM
Re: 94' Vic Differential Replacement
[Re: Isaiah_Romsdahl]
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Poobah
Registered: 12/14/02
Posts: 8854
Loc: MA
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Yes, they're both 8.8" rear ends, but the axle tubes (and shafts) in the Mustang are shorter.
_________________________
'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen
'11 Grand Marquis LS Ultimate Edition (Black)
'00 Grand Marquis GS (Silver)
Rotted frame and broken transmission crossmember
Being resurrected...slowly.
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#4121006 - 09/15/21 07:29 PM
Re: 94' Vic Differential Replacement
[Re: RF_Overlord]
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Climber
Registered: 09/19/20
Posts: 675
Loc: NC
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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. 3.27 will vibrate a steel driveshaft at around 80 ish mph
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#4130062 - 12/11/21 02:04 AM
Re: 94' Vic Differential Replacement
[Re: Isaiah_Romsdahl]
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n00b
Registered: 07/15/21
Posts: 11
Loc: NC
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So what rear ends can I look for that will provide me with a LSD and fit my car without any heavy modification? I was under the impression that rear ends from Rangers, Mustangs and F-150's from the time might work, but I would like to know some specific names of rear ends, if anyone knows, so I can start looking. More than anything, I would love to have an LSD rear-end on my vic, and from what I have read, there should be some rear ends I can take from the junkyard and put right on my vic to make this happen.
Edited by Isaiah_Romsdahl (12/11/21 02:11 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
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#4130074 - 12/11/21 02:06 PM
Re: 94' Vic Differential Replacement
[Re: Isaiah_Romsdahl]
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n00b
Registered: 11/02/21
Posts: 44
Loc: CA
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The differential carrier is what will fit your crown victoria from those other cars. If you want the differential/axle to just plug and play you'll have to look for a 92-97 vic/marq. Differential covers usually have tags with gear size and one for recommended oil. You'll also be looking for an "L" in the decimals place thats a traclok. For example 3L27, 3L55 open diffs will have a space between. If you get a retired cruiser's axle get the drive line as well.
_________________________
2003 P71 117,xxx miles, 4.10 gears and J-mod.
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#4130076 - 12/11/21 02:11 PM
Re: 94' Vic Differential Replacement
[Re: Isaiah_Romsdahl]
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n00b
Registered: 11/02/21
Posts: 44
Loc: CA
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Also I forgot axle codes on door stickers makes it easier, dont have to get under car. Look for tags cause if they are missing could mean a possible swap better gears or carrier.
_________________________
2003 P71 117,xxx miles, 4.10 gears and J-mod.
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#4130106 - 12/12/21 01:04 AM
Re: 94' Vic Differential Replacement
[Re: Isaiah_Romsdahl]
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n00b
Registered: 07/15/21
Posts: 11
Loc: NC
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I found an 08 3l27 rear end from another crown vic. Will this fit mine 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
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#4130134 - 12/12/21 12:24 PM
Re: 94' Vic Differential Replacement
[Re: Isaiah_Romsdahl]
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n00b
Registered: 11/02/21
Posts: 44
Loc: CA
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Like I said before anything besides 92-97 crown victorias or grand marquis only the carrier will swap.
_________________________
2003 P71 117,xxx miles, 4.10 gears and J-mod.
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#4130148 - 12/12/21 03:10 PM
Re: 94' Vic Differential Replacement
[Re: Isaiah_Romsdahl]
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Poobah
Registered: 12/14/02
Posts: 8854
Loc: MA
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I found an 08 3l27 rear end from another crown vic. Will this fit mine as well? No. '03+ had significant changes in the rear axle assembly, primarily in that it is longer than '02-. You need either a '92-'97 axle assembly or swap your existing ring and pinion. (and the carrier if you want LSD)
_________________________
'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen
'11 Grand Marquis LS Ultimate Edition (Black)
'00 Grand Marquis GS (Silver)
Rotted frame and broken transmission crossmember
Being resurrected...slowly.
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#4130208 - 12/13/21 10:12 AM
Re: 94' Vic Differential Replacement
[Re: Isaiah_Romsdahl]
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n00b
Registered: 07/15/21
Posts: 11
Loc: NC
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So what I'm hearing is that there aren't any lsd full rear end assemblies that I can swap into my car directly(?) The only option I have is to replace the carrier itself?
_________________________
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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#4130238 - 12/13/21 01:43 PM
Re: 94' Vic Differential Replacement
[Re: Isaiah_Romsdahl]
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Poobah
Registered: 12/14/02
Posts: 8854
Loc: MA
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You're not listening to us: you can use any '92-'97 axle assembly. Finding one with limited-slip may be a challenge.
_________________________
'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen
'11 Grand Marquis LS Ultimate Edition (Black)
'00 Grand Marquis GS (Silver)
Rotted frame and broken transmission crossmember
Being resurrected...slowly.
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