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#4120958 - 09/15/21 02:08 PM Re: 94' Vic Differential Replacement [Re: Isaiah_Romsdahl]
Isaiah_Romsdahl Offline

Registered: 07/15/21
Posts: 8
Loc: NC
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?
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

#4120960 - 09/15/21 02:12 PM Re: 94' Vic Differential Replacement [Re: Isaiah_Romsdahl]
RF_Overlord Offline


Registered: 12/14/02
Posts: 7677
Loc: MA
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

'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.

#4121006 - 09/15/21 07:29 PM Re: 94' Vic Differential Replacement [Re: RF_Overlord]
hkerekes Offline

Registered: 09/19/20
Posts: 143
Loc: NC
Originally Posted By RF_Overlord
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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