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#977694 - 07/12/13 09:20 PM Junkyard 3.5 inch Aluminium Drive shaft for $26.38  
Joined: Jan 2001
Posts: 697
CANADIAN87SS Offline
15+ Year
CANADIAN87SS  Offline
15+ Year
Member

Joined: Jan 2001
Posts: 697
EDMONTON, ALBERTA,CANADA
I have been watching with interest the B body 94-96 Impala SS guys swap the Ford Crown Victoria "P71" police cruiser drive shaft into their cars hoping I can use this shaft (shortened) in my 87 Monte LS engine swap. The shaft is a direct fit into B bodies with extended lower control arms. Apparently in the 1999 & 2000 model years, Ford installed 3.55 ratio rear ends in the cop cars and the critical drive shaft speed in pursuit situations was such that they installed a MMC (metal matrix composite) driveshaft designed to handle higher rotational speeds. The MMC driveshaft is made of an aluminum matrix reinforced with boron carbide, allowing the critical speed of the driveshaft to be raised by reducing inertia.
http://en.wikipedia.org/wiki/Metal_matrix_composite

Quote from the Impala board: "MMC's elasticity allows the shaft to absorb more drive-line vibrations. The issue with shafts is that they create ultra high frequency vibrations at high rpms, which can cause them to self-destruct. MMC absorbs shaft twist and vibration much better. The MMC shaft's critical speed is 9093 rpm, and the normal P71 aluminum shaft is 7930 rpms."

While 3.5" Aluminium drive shafts are in all the late model Crown Vic P71 police cars these two years (1999 & 2000) are special. P71 denoting cop car is located in the 5,6 and 7th digit of the VIN. The MMC shafts have small Gold MMC lettering on one end so you can confirm you have the right one. Non MMC P71 shafts have the words “police” stenciled in black on them. The shafts are 55.5 inches long so I don’t know what other cars they will fit into?

I am installing a 8.5" Grand National rear end and 4L80E transmission in my LS swap so I purchased at Pic N Pull during a sale a MMC drive shaft for $26.38. 4 bolts at the rear of the shaft and the front yoke slides out of the transmission and you are done in 10 minutes. Make sure you have 12pt 3/8” metric sockets with you to fit the special bolts.

The 1999 - 2005 ford P71 shafts use 1330 u joints and my yoke is 1350 so I need a 1330 X 1350 conversion U joint in the front. In the rear the GN rear end uses a 3R or S44 U joint so I need a 1330 X S44/3R series conversion joint. Both joints can be found on eBay. The 1330 X S44/3R series U Joint is the same one the Impala guys are using which makes sense since those cars also have 8.5” rear ends. I have not yet had the driveshaft shortened and hopefully the MMC material does not create welding problems? If so I will get a regular Crown Vic P71 3.5” shaft as the critical speeds mentioned above for even the regular shaft are higher than I will ever go. Up here in Canada its $150 to shorten and balance a drive shaft at my local shop.
There is some suggestion on the Impala site that the 2006 and newer P71 cop cars use the larger/stronger 1350 U joints. Another option?

This is a shade tree way to get a 3.5" aluminium shaft for cheap. I think G Body stock steel shafts are only 2.75” and a Grand National stock Shaft is 3” but someone may correct me.
Does anyone know how much power these Ford shafts will take?

Heres the link on the Impala board for pictures of the shafts and further details. It’s a 15-16 page read.. One contributor provided a decoder (post # 86) for the Rear End Tag so that you can confirm you have a 1999-2000 MMC shaft.
http://www.impalassforum.com/vBulletin/showthread.php?t=271635


**1987 White/Burgandy SS 10" Budnik Tiller's aka: "NUBS", wrapped in 'Notyomomma' AVS Sports, HAL Q-A1 steak sauce, Mobil Home synthetic Headlight fluid, custom tear on driver seat, black carpet but started off gray, drive shaft loopty-loop thingy, $3.73 gears, Junky Jet programming & junk in the trunk, 'Tytaynium' muffler bearings,
#977847 - 07/14/13 08:03 PM Re: Junkyard 3.5 inch Aluminium Drive shaft for $26.38 [Re: CANADIAN87SS]  
Joined: Aug 2000
Posts: 3,355
Phil87SS Offline
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15+ Year
Phil87SS  Offline
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Member

Joined: Aug 2000
Posts: 3,355
Gilbert, Arizona
I'm not sure how much power these Ford units will take but what I am interested in is the weight, have you weighed the aluminum vs steel?
I have heard of guys picking up a couple of tenths in the 1/4 mile by going to a lightweight drive-shaft.
Thanks for the info.


1987 Monte Carlo SS, '78 406, Speed Density TPI, Herbert Hyd Roller Cam, Trick-Flow "Twisted Wedge" 1st gen alum. heads, 11.0:1 compression, Sealed-Power pistons w/gapless rings, Mallory CD ignition, 30 lb Accel injectors, Edelbrock headers, Bosch external fuel pump, 36 lb Centerforce flywheel, 1993 T-56 6-speed,Hurst shifter and stock 3:73 Posi.
#977885 - 07/15/13 04:34 AM Re: Junkyard 3.5 inch Aluminium Drive shaft for $26.38 [Re: CANADIAN87SS]  
Joined: Jan 2001
Posts: 697
CANADIAN87SS Offline
15+ Year
CANADIAN87SS  Offline
15+ Year
Member

Joined: Jan 2001
Posts: 697
EDMONTON, ALBERTA,CANADA
According to a Crown Vic site
MMX weight with both universals on it ~ 16.5 lbs
Aluminum P71 drive shaft with both universals on it ~17 lbs
I would expect steel to be double that but have not weighed mine.


**1987 White/Burgandy SS 10" Budnik Tiller's aka: "NUBS", wrapped in 'Notyomomma' AVS Sports, HAL Q-A1 steak sauce, Mobil Home synthetic Headlight fluid, custom tear on driver seat, black carpet but started off gray, drive shaft loopty-loop thingy, $3.73 gears, Junky Jet programming & junk in the trunk, 'Tytaynium' muffler bearings,
#980283 - 08/12/13 06:46 PM Re: Junkyard 3.5 inch Aluminium Drive shaft for $26.38 [Re: CANADIAN87SS]  
Joined: Feb 2013
Posts: 140
Warriorridge Offline
Member
Warriorridge  Offline
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Joined: Feb 2013
Posts: 140
Petersburg PA
Did you ever find out if the mmx shaft can be welded to shorten it?

#980289 - 08/12/13 07:47 PM Re: Junkyard 3.5 inch Aluminium Drive shaft for $26.38 [Re: CANADIAN87SS]  
Joined: Apr 2010
Posts: 475
93lt1s10 Offline
Member
93lt1s10  Offline
Member

Joined: Apr 2010
Posts: 475
Middletown, DE
X2 ^ I've been waiting for this response on tech. Beats 500 bux for a custom one.


85 Monte Carlo SS ---> 6.2l l92 / 4l80e swap - 400+whp club

Best track times to date: 11.137 @ 123.15 mph

93 Chevy S10--->lt1/t56 daily driven = 313rwhp/337tq GONE BUT NEVER FORGOTTEN!!
#980383 - 08/13/13 12:25 PM Re: Junkyard 3.5 inch Aluminium Drive shaft for $26.38 [Re: CANADIAN87SS]  
Joined: Jul 2001
Posts: 4,488
Joe87monteSS Offline
15+ Year
Joe87monteSS  Offline
15+ Year
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Joined: Jul 2001
Posts: 4,488
Memphis,TN
FYI, I have a PST aluminum driveshaft. 3.5 diameter x 52.5 inches long. Total weight with a pair of 1350 U joints installed is 11.4 lbs.

I'm not concerned with the weight of the yokes as I want the strongest ones available.


Joey
Engine/head builder/machinist
1987 Monte Carlo SS 383/4 Speed
2004 Silverado
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#980443 - 08/14/13 01:50 AM Re: Junkyard 3.5 inch Aluminium Drive shaft for $26.38 [Re: CANADIAN87SS]  
Joined: Oct 2007
Posts: 1,170
pazzo1969 Offline
Member
pazzo1969  Offline
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Joined: Oct 2007
Posts: 1,170
Mableton, GA
Have the same pst shaft plus two other lengths. Yes not cheap. Haven't seen anything on shortning the mmx material. All i can say is they better know what they are doing. Pazz


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