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Author
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Topic: FMX to C4 Swap
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skips69
Gearhead Posts: 187
From: Catlin, IL USA
Registered: Mar 2001
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posted 03-02-2002 05:14 PM
   
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
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posted 03-02-2002 06:47 PM
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.  ------------------
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
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posted 03-02-2002 11:49 PM
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
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posted 03-03-2002 12:32 AM
What's wrong with the FMX trannys? Just curious!
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mellowyellow
Gearhead Posts: 5456
From: So. Fl.
Registered: Aug 2000
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posted 03-03-2002 08:21 AM
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
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posted 03-03-2002 10:21 AM
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
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posted 03-04-2002 01:48 AM
FMX is lame!  ------------------
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
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posted 03-04-2002 09:30 AM
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
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posted 03-04-2002 01:46 PM
Nope. They are still 5/16 tube. ------------------
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
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posted 03-04-2002 02:48 PM
Same bend, same length? That's what I was after.
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SteveLaRiviere
Administrator Posts: 30097
From: Saco, Maine
Registered: May 99
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posted 03-04-2002 03:01 PM
The lines will be different as the taps are in different place. Not very hard to adapt.------------------
'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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