C4 or FMX?
Thread Starter
2nd Gear Member
Joined: Jun 2005
Posts: 419
From: Arizona
C4 or FMX?
Hey guys, I am having some problems with my transmission.... I replaced the tail shaft seal about 10 months ago and it went bad about 2 months after I put it on and I had a hard time finding the seal in the first place because the only one that seemed to fit was a C6 tail shaft seal.... now I know that it is not a C6 but I was wondering if it could possibly be a FMX trany.... how would I be able to tell the difference and what can I do about replacing the seal with one that will work?
I have a C4 on a 289 66 (as far as I know)
Thanks for any help posible
I have a C4 on a 289 66 (as far as I know)
Thanks for any help posible
5th Gear Member
Joined: Mar 2005
Posts: 3,566
From: Marquette Mi
RE: C4 or FMX?
FMX isnt a bad trans. It has a cast iron case so its substantially heavier than a C4 but has only a modest improvement in durability. Due to it being an inbetween type trans, it doesnt have much of an aftermarket following and support base. So getting a converter for it take a bit more than a C4 or C6.
The way to tell if you have a C4 or FMX is by the case. if its all aluminum, its not a C4, if it has a cast iron case it would be an FMX.. This is only relevant in the world of mustangs and Fords from 1969 to the mid 70s.
many earlier automatic transmissions had cast iron cases, so just because it has an iron case doesnt mean its an FMX.. but if its in a Mustang or Fairlane etc, it most likely is
The way to tell if you have a C4 or FMX is by the case. if its all aluminum, its not a C4, if it has a cast iron case it would be an FMX.. This is only relevant in the world of mustangs and Fords from 1969 to the mid 70s.
many earlier automatic transmissions had cast iron cases, so just because it has an iron case doesnt mean its an FMX.. but if its in a Mustang or Fairlane etc, it most likely is
5th Gear Member
Joined: Aug 2004
Posts: 2,593
From: ABQ, NM, USA
RE: C4 or FMX?
ORIGINAL: THUMPIN455
FMX isnt a bad trans. It has a cast iron case so its substantially heavier than a C4 but has only a modest improvement in durability. Due to it being an inbetween type trans, it doesnt have much of an aftermarket following and support base. So getting a converter for it take a bit more than a C4 or C6.
The way to tell if you have a C4 or FMX is by the case. if its all aluminum, its not a C4, if it has a cast iron case it would be an FMX.. This is only relevant in the world of mustangs and Fords from 1969 to the mid 70s.
many earlier automatic transmissions had cast iron cases, so just because it has an iron case doesnt mean its an FMX.. but if its in a Mustang or Fairlane etc, it most likely is
FMX isnt a bad trans. It has a cast iron case so its substantially heavier than a C4 but has only a modest improvement in durability. Due to it being an inbetween type trans, it doesnt have much of an aftermarket following and support base. So getting a converter for it take a bit more than a C4 or C6.
The way to tell if you have a C4 or FMX is by the case. if its all aluminum, its not a C4, if it has a cast iron case it would be an FMX.. This is only relevant in the world of mustangs and Fords from 1969 to the mid 70s.
many earlier automatic transmissions had cast iron cases, so just because it has an iron case doesnt mean its an FMX.. but if its in a Mustang or Fairlane etc, it most likely is
5th Gear Member
Joined: Feb 2005
Posts: 2,707
From: San Francisco
RE: C4 or FMX?
ORIGINAL: 69mach1377
I agree, mostly. I can't seem to break my FMX so I can get something else and I've been trying for 17 years. It leaks after 37 years but it just won't die...
ORIGINAL: THUMPIN455
FMX isnt a bad trans. It has a cast iron case so its substantially heavier than a C4 but has only a modest improvement in durability. Due to it being an inbetween type trans, it doesnt have much of an aftermarket following and support base. So getting a converter for it take a bit more than a C4 or C6.
The way to tell if you have a C4 or FMX is by the case. if its all aluminum, its not a C4, if it has a cast iron case it would be an FMX.. This is only relevant in the world of mustangs and Fords from 1969 to the mid 70s.
many earlier automatic transmissions had cast iron cases, so just because it has an iron case doesnt mean its an FMX.. but if its in a Mustang or Fairlane etc, it most likely is
FMX isnt a bad trans. It has a cast iron case so its substantially heavier than a C4 but has only a modest improvement in durability. Due to it being an inbetween type trans, it doesnt have much of an aftermarket following and support base. So getting a converter for it take a bit more than a C4 or C6.
The way to tell if you have a C4 or FMX is by the case. if its all aluminum, its not a C4, if it has a cast iron case it would be an FMX.. This is only relevant in the world of mustangs and Fords from 1969 to the mid 70s.
many earlier automatic transmissions had cast iron cases, so just because it has an iron case doesnt mean its an FMX.. but if its in a Mustang or Fairlane etc, it most likely is
or just pull it and sell it to offset the cost of the new T5.
2nd Gear Member
Joined: Apr 2005
Posts: 277
From:
RE: C4 or FMX?
One way to tell which trans you have is by the tranny pan. I forget the specifics, but I have seen diagrams in a catalog that shows the different tranny pans to identify which tranny you have. I will look for it this evening.
Thread Starter
2nd Gear Member
Joined: Jun 2005
Posts: 419
From: Arizona
RE: C4 or FMX?
ORIGINAL: rmodel65
probably need to replace the bushing in the trans tailshaft its probably worn allowing the yoke to wiggle wearing the seal!
probably need to replace the bushing in the trans tailshaft its probably worn allowing the yoke to wiggle wearing the seal!
Thanks, thats more or less what I was looking for.
Im not worried about building a trany right now, I was just wondering why my seal went out on me, and ill wait untill I have time and just rip the whole trany out and take my time fixing/rebuilding it.