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#4043190 - 01/12/20 07:08 PM Shafts & Gears
punkroqgearhead Offline
n00b

Registered: 11/13/08
Posts: 20
Loc: West Coast
Been a while since I've posted. I sold my previous '98 P71 back in '08. Now, I'm trying to find another P71. My target years are 2001-2004, it be nice if I could find a unicorn with the 3.55 and limited slip.

Questions are,

What years were the MMC shafts used?

I've read just '99 and '00, however I found an '01 with an MMC at a JY years ago with an MMC shaft? I tried searching and couldn't get a definite answer..

Also, from what I've gathered not all years had the 3.55 limited slip option, if that's the case, what years did for sure? I wouldn't mind a 3.27 car with limited slip either.

Last, did all years have the X5 code on the door for limited slip with 3.27 and C6 for 3.55 with limited slip?

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#4043194 - 01/12/20 07:35 PM Re: Shafts & Gears [Re: punkroqgearhead]
2004_p71 Offline

no replacement for displacement
Posting Addict

Registered: 09/04/03
Posts: 15214
Loc: Quebec Canada
In short

1-99 00 in most case as you already stated.
2-there are no defenite answers
3-yup

Your best bet is trying to find an 04 p71 and rebuilt the diff and call it a day .
The mmc drive shaft is pretty much useless and going from 3.27 to 3.55 is also useless, rule of thumb is minimum two gear step and even tho most people who did it wish they went with more gears.
_________________________


new best time 13.079 @ 105 1.8 60'

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#4043198 - 01/12/20 08:35 PM Re: Shafts & Gears [Re: punkroqgearhead]
ClayBelt Offline
Over the Hill

Registered: 04/03/18
Posts: 1020
Loc: Leon County
99-00, but iirc they were retroactively applied to some 01's under a service bulletin that permitted a user here to justify having Ford install an MMX in his Marauder
_________________________
There’s a right way, a wrong way, and a janky way to fix something; I don’t usually have the brains or the money to pick the right way.

2001 Chevrolet Tracker LT “Featherbrick” - 6/2016-10/2016 - SOLD
2005 Toyota 4Runner SR5 “Panzer” - 8/2016-4/2018 - SOLD
1966 Ford Thunderbird “Fordy McFordface” - 11/2016-?
2005 Buick LaCrosse CXS “Jumba” - 2/2017-2/2018 - 2010 Camaro V6, Flowmaster Super 44’s - SOLD
2010 Mercury Grand Marquis LS “Fat Man” - 4/2018-? - lotta mods
1990 Mazda Miata “Little Boy” - 5/2019-10/2019 - pile of [censored] - SOLD

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#4043204 - 01/12/20 08:57 PM Re: Shafts & Gears [Re: punkroqgearhead]
TheCableGuy Offline
Member

Registered: 04/08/19
Posts: 414
Loc: Far Northwest AZ
Oddball question but wasn’t the 04 plagued with transmission issues? Or is that just rumors/wrong info lol.
_________________________
2010 CVPI 146K. 11,400 idle hours. 3.27 gears. Cheap RKE
2011 Sierra 1500 155K, too many mods to list. (RIP 01-05-2019)
2001 Durango R/T 5.9. 230K. SOLD 5-1-19

Not much of a Ford guy but I sure love this Crown Vic.


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#4043236 - 01/13/20 02:25 AM Re: Shafts & Gears [Re: 2004_p71]
punkroqgearhead Offline
n00b

Registered: 11/13/08
Posts: 20
Loc: West Coast
Originally Posted By 2004_p71
In short

1-99 00 in most case as you already stated.
2-there are no defenite answers
3-yup

Your best bet is trying to find an 04 p71 and rebuilt the diff and call it a day .
The mmc drive shaft is pretty much useless and going from 3.27 to 3.55 is also useless, rule of thumb is minimum two gear step and even tho most people who did it wish they went with more gears.


Thanks for your response.

I will respectfully disagree about the MMC being useless. Put one in place of a steel driveshaft in an O/T Impala SS and I was pleasantly surprised in the power it freed up from having less rotational mass. It would spin the tires much easier, the ole butt dyno confirmed it to.

BTW, an '04 is #1 on my list, however, they're getting harder to find..

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#4043238 - 01/13/20 02:26 AM Re: Shafts & Gears [Re: ClayBelt]
punkroqgearhead Offline
n00b

Registered: 11/13/08
Posts: 20
Loc: West Coast
Originally Posted By ClayBelt
99-00, but iirc they were retroactively applied to some 01's under a service bulletin that permitted a user here to justify having Ford install an MMX in his Marauder


Interesting.

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#4043240 - 01/13/20 02:27 AM Re: Shafts & Gears [Re: TheCableGuy]
punkroqgearhead Offline
n00b

Registered: 11/13/08
Posts: 20
Loc: West Coast
Originally Posted By TheCableGuy
Oddball question but wasn’t the 04 plagued with transmission issues? Or is that just rumors/wrong info lol.


I can't answer that, however, from my research they're a one year only trans..


Edited by punkroqgearhead (01/13/20 02:40 AM)

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#4043254 - 01/13/20 07:05 AM Re: Shafts & Gears [Re: TheCableGuy]
2004_p71 Offline

no replacement for displacement
Posting Addict

Registered: 09/04/03
Posts: 15214
Loc: Quebec Canada
Originally Posted By TheCableGuy
Oddball question but wasn’t the 04 plagued with transmission issues? Or is that just rumors/wrong info lol.


never heard of that .
what I can tel you is that the 01,02,03 model al suffered from bad timing chain guides and they need to be replaced. Lots of them have been done under warranty but if not you would be on borrowed time .
_________________________


new best time 13.079 @ 105 1.8 60'

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#4043256 - 01/13/20 07:18 AM Re: Shafts & Gears [Re: punkroqgearhead]
2004_p71 Offline

no replacement for displacement
Posting Addict

Registered: 09/04/03
Posts: 15214
Loc: Quebec Canada
Originally Posted By punkroqgearhead
Originally Posted By TheCableGuy
Oddball question but wasn’t the 04 plagued with transmission issues? Or is that just rumors/wrong info lol.


I can't answer that, however, from my research they're a one year only trans..

no
it,s the same standard 4R70W, 4R75W came in 05+
_________________________


new best time 13.079 @ 105 1.8 60'

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#4043258 - 01/13/20 07:20 AM Re: Shafts & Gears [Re: punkroqgearhead]
2004_p71 Offline

no replacement for displacement
Posting Addict

Registered: 09/04/03
Posts: 15214
Loc: Quebec Canada
Originally Posted By punkroqgearhead
Originally Posted By 2004_p71
In short

1-99 00 in most case as you already stated.
2-there are no defenite answers
3-yup

Your best bet is trying to find an 04 p71 and rebuilt the diff and call it a day .
The mmc drive shaft is pretty much useless and going from 3.27 to 3.55 is also useless, rule of thumb is minimum two gear step and even tho most people who did it wish they went with more gears.


Thanks for your response.

I will respectfully disagree about the MMC being useless. Put one in place of a steel driveshaft in an O/T Impala SS and I was pleasantly surprised in the power it freed up from having less rotational mass. It would spin the tires much easier, the ole butt dyno confirmed it to.

BTW, an '04 is #1 on my list, however, they're getting harder to find..


well you went from a steel to an aluminum drive shaft so that explain why.
Now if you get a p71 it comes with an aluminum drive shaft so going to an mmx is pointless.
_________________________


new best time 13.079 @ 105 1.8 60'

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#4043282 - 01/13/20 01:13 PM Re: Shafts & Gears [Re: ClayBelt]
gDMJoe Offline


Poobah

Registered: 06/03/03
Posts: 7626
Loc: Timbuk3, MI
Quote:
ClayBelt 99-00, but iirc they were retroactively applied to some 01's under a service bulletin that permitted a user here to justify having Ford install an MMX in his Marauder

_________________________

-click the Vic-

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#4043286 - 01/13/20 01:19 PM Re: Shafts & Gears [Re: punkroqgearhead]
gDMJoe Offline


Poobah

Registered: 06/03/03
Posts: 7626
Loc: Timbuk3, MI
Possible other consideration when installing the (A)MMC driveshaft ...


  • *METCO part # MDL2300 ««« -click-
_________________________

-click the Vic-

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#4043320 - 01/13/20 07:00 PM Re: Shafts & Gears [Re: gDMJoe]
ClayBelt Offline
Over the Hill

Registered: 04/03/18
Posts: 1020
Loc: Leon County
Originally Posted By gDMJoe
Quote:
ClayBelt 99-00, but iirc they were retroactively applied to some 01's under a service bulletin that permitted a user here to justify having Ford install an MMX in his Marauder





My bad, maybe it was some 98's then. I know it was one of those bracketing years.
_________________________
There’s a right way, a wrong way, and a janky way to fix something; I don’t usually have the brains or the money to pick the right way.

2001 Chevrolet Tracker LT “Featherbrick” - 6/2016-10/2016 - SOLD
2005 Toyota 4Runner SR5 “Panzer” - 8/2016-4/2018 - SOLD
1966 Ford Thunderbird “Fordy McFordface” - 11/2016-?
2005 Buick LaCrosse CXS “Jumba” - 2/2017-2/2018 - 2010 Camaro V6, Flowmaster Super 44’s - SOLD
2010 Mercury Grand Marquis LS “Fat Man” - 4/2018-? - lotta mods
1990 Mazda Miata “Little Boy” - 5/2019-10/2019 - pile of [censored] - SOLD

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#4043350 - 01/13/20 08:00 PM Re: Shafts & Gears [Re: 2004_p71]
punkroqgearhead Offline
n00b

Registered: 11/13/08
Posts: 20
Loc: West Coast
Originally Posted By 2004_p71
Originally Posted By punkroqgearhead
Originally Posted By 2004_p71
In short

1-99 00 in most case as you already stated.
2-there are no defenite answers
3-yup

Your best bet is trying to find an 04 p71 and rebuilt the diff and call it a day .
The mmc drive shaft is pretty much useless and going from 3.27 to 3.55 is also useless, rule of thumb is minimum two gear step and even tho most people who did it wish they went with more gears.


Thanks for your response.

I will respectfully disagree about the MMC being useless. Put one in place of a steel driveshaft in an O/T Impala SS and I was pleasantly surprised in the power it freed up from having less rotational mass. It would spin the tires much easier, the ole butt dyno confirmed it to.

BTW, an '04 is #1 on my list, however, they're getting harder to find..


well you went from a steel to an aluminum drive shaft so that explain why.
Now if you get a p71 it comes with an aluminum drive shaft so going to an mmx is pointless.


That was my point, those driveshafts are not "pretty much useless" to everyone.

I agree that it wouldn't be worth going to MMC from aluminum if the car is already equipped with one.

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