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  FMX to C4 Swap

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Author Topic:   FMX to C4 Swap
skips69
Gearhead

Posts: 187
From: Catlin, IL USA
Registered: Mar 2001

posted 03-02-2002 05:14 PM     Click Here to See the Profile for skips69   Click Here to Email skips69     Edit/Delete Message   Reply w/Quote
The car is a 69' sportsroof with the original 351W and FMX trans. Is a C4 swap just a simple exchange? Will my current trans cross member work, need to be exchanged, modified? Will the current driveshaft work, need shortened, extended? The C4 came out of a 73' Mustang and was bolted to a 351W. All indications are that this is a 74' engine and trans - it was not original to the car that it came from. Anyone done this swap before, care to leave some advice, lessons learned, etc? Thanks in advance!

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Moneymaker
Administrator

Posts: 18092
From: Lyons, IL, USA
Registered: May 99

posted 03-02-2002 06:47 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Simple swap. Cross member, driveshaft, trans mount, shift rod can all be retained. You can use the same flex plate as long as you get a large bell housing C-4. 74 Mustangs did not come with V-8's so it is not likey that it is a Mustang trans if it is indeed a 74.

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Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link

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skips69
Gearhead

Posts: 187
From: Catlin, IL USA
Registered: Mar 2001

posted 03-02-2002 11:49 PM     Click Here to See the Profile for skips69   Click Here to Email skips69     Edit/Delete Message   Reply w/Quote
Thanks Alex. The PN starts with a D4 on the transmission, and I know it didn't originally come in the car I pulled it from. Since it is still mated to the 351W that it came with, it will have to be the correct bell housing............

Thanks again, I will likely have it rebuilt this spring instead of my FMX.

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zaac
Journeyman

Posts: 22
From: Alberta
Registered: Feb 2002

posted 03-03-2002 12:32 AM     Click Here to See the Profile for zaac   Click Here to Email zaac     Edit/Delete Message   Reply w/Quote
What's wrong with the FMX trannys? Just curious!

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mellowyellow
Gearhead

Posts: 5456
From: So. Fl.
Registered: Aug 2000

posted 03-03-2002 08:21 AM     Click Here to See the Profile for mellowyellow     Edit/Delete Message   Reply w/Quote
I had a 72 Gran Torino with a Cleveland, and I believe, an FMX. It was a troublesome trans. In 2 years of ownership, it was down twice. Thank God for warranty.

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skips69
Gearhead

Posts: 187
From: Catlin, IL USA
Registered: Mar 2001

posted 03-03-2002 10:21 AM     Click Here to See the Profile for skips69   Click Here to Email skips69     Edit/Delete Message   Reply w/Quote
Nothing wrong with the trans, but it is the only item not rebuilt or replaced in the 6 years I have had the car. I plan on keeping it in storage, but the C4 is lighter and has more readily available parts - for rebuild and then some.

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Moneymaker
Administrator

Posts: 18092
From: Lyons, IL, USA
Registered: May 99

posted 03-04-2002 01:48 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
FMX is lame!

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Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link

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skips69
Gearhead

Posts: 187
From: Catlin, IL USA
Registered: Mar 2001

posted 03-04-2002 09:30 AM     Click Here to See the Profile for skips69   Click Here to Email skips69     Edit/Delete Message   Reply w/Quote
Yes, it is sluggish and overweight. One quick question - transmission fluid lines, do they need modified, replaced?

Thanks again!

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Moneymaker
Administrator

Posts: 18092
From: Lyons, IL, USA
Registered: May 99

posted 03-04-2002 01:46 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Nope. They are still 5/16 tube.

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Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link

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skips69
Gearhead

Posts: 187
From: Catlin, IL USA
Registered: Mar 2001

posted 03-04-2002 02:48 PM     Click Here to See the Profile for skips69   Click Here to Email skips69     Edit/Delete Message   Reply w/Quote
Same bend, same length? That's what I was after.

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SteveLaRiviere
Administrator

Posts: 30097
From: Saco, Maine
Registered: May 99

posted 03-04-2002 03:01 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
The lines will be different as the taps are in different place. Not very hard to adapt.

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'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip

MCA Member # 47773

Reality is a good thing, try it sometime.

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