C4 Crossmember

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boilermaster

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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

 

Hemikiller

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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.

 

sdtommy75

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

 

afeng79

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I should have the C4 crossmember laying around as well after doing my trans swap. Might be extremely oily though :)

 

boilermaster

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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

 

Hemikiller

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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.

1443373156554-1990602758.jpg

 

boilermaster

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Correct crossmember and shift linkage installed.

Thank's Hemikiller.

Boilermaster

 
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