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C4 Crossmember
#1
Greetings fellow Mustang owners,
Recently started working on my (new to me) 71 fastback.
Door sticker says trans code is W which should translate to a c4 unit.
It does in fact have a C4 installed, however this is a case filled unit
and the shift linkage looks to be from a column shift and the bell housing has threaded holes for cable shift and the bell attaches thru the pump bolts.
I am fine with all of this (trans was recently rebuilt by a reputable builder)
MY main concern is the FMX crossmember, when I did some checking the trans was cocked to one side. rear mount bolt on the right was resting against the crossmember, used a 1/2'' allen screw in place of the bolt and relieved the crossmember for the time being (no intention of actually driving the car in this condition.
Cannot find a part number for the correct crossmember or anyone that advertises one for the 71-73 mustang.
other oddities include a fmx shifter (neutral switch in the shifter housing)
driveshaft appears to be correct for a C4
Q: did this car come with a C4 and someone change to a FMX and then back again to a C4 ?
any information on parts availability would be greatly appreciated.
Boilermaster
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#2
This:
http://www.7173mustangs.com/thread-c4-cr...r-question

Pete - MotoArts Decals and Signs
'71 Sportsroof 351C-4V/4-speed - FINALLY under construction - no, wait, on hold again...
'90 Mustang 7-Up 5.0 ragtop, rolling beater
'66 Sunbeam Tiger Mk.IA, survivor
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#3
MotoArts;242452 Wrote:This:
http://www.7173mustangs.com/thread-c4-cr...r-question

Thanks MotpoArts,
The one in the pic looks much better than what I have.
now to find one.
Boilermaster
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#4
The 4 leg crossmember is the correct piece for a C-4. The three leg is FMX/C-6 and doesn't place the transmission properly. I may have a spare C-4 piece, shoot me a PM as a reminder to look.

My guess on the FMX shifter was probably to fix the lack of a NS switch on the trans case.

BTW, I remember seeing somewhere that the correct C-4 floor shift bellcrank is now being reproduced 0 if you wanted to go there.


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#5
I just picked one of those crossmembers up from Perogie Ent (609-448-1684) for my 4 speed conversion. Wasn't expensive.

Currently own:
2009 P71 Crown Vic, Royal Blue
1975 Gapp & Roush built Mustang II for Joe Ruggirello, "Sudden Death"
1972 Mustang Grandé, Medium Yellow Gold, Ginger Interior, 351C, original paint/interior, 60k miles
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#6
I should have the C4 crossmember laying around as well after doing my trans swap. Might be extremely oily though Smile
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#7
After further inspection, I may need a different shift linkage for the C4 transmission , cleaned up what I have (D1ZA 7340) and I believe this is for FMX.
It would appear that I need D1AZ-7340-CA , can anyone confirm this ?
Also do shifters for a C-4 and FMX differ as far as the linkage is concerned , I am good with having the switch in the shifter as opposed to being on the transmission , still looking for a crossmember btw.
Boilermaster
  Reply
#8
boilermaster;242685 Wrote:After further inspection, I may need a different shift linkage for the C4 transmission , cleaned up what I have (D1ZA 7340) and I believe this is for FMX.
It would appear that I need D1AZ-7340-CA , can anyone confirm this ?
Also do shifters for a C-4 and FMX differ as far as the linkage is concerned , I am good with having the switch in the shifter as opposed to being on the transmission , still looking for a crossmember btw.
Boilermaster

Found the C4 xmember and the -CA shift rod you are looking for. Shoot me a pm and we can figure out the details.


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#9
Correct crossmember and shift linkage installed.
Thank's Hemikiller.
Boilermaster
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