C4 or a C6?

truckjunky87 · Post by **truckjunky87** » Fri Nov 12, 2004 6:32 pm

What automatic would most likely be behind a 352 FE in a '67 F100?

flyboy2610 · Post by **flyboy2610** » Fri Nov 12, 2004 6:55 pm

Probably a C6.

crazy larry · Post by **crazy larry** » Fri Nov 12, 2004 7:08 pm

or an FMX.

Post by **DuckRyder** » Fri Nov 12, 2004 8:40 pm

I agree FMX or C6 (not a C4)

BigRedTruck · Post by **BigRedTruck** » Fri Nov 12, 2004 9:41 pm

what is the difference between fmx and c6 are they not the same?

Comet · Post by **Comet** » Sat Nov 13, 2004 11:51 pm

They are not the same. C6 is a heavy duty tranny. I have heard that FMX's are getting hard to find for parts nowadays.

MudinMan4x4 · Post by **MudinMan4x4** » Sat Nov 13, 2004 11:54 pm

seems like alot of 68 and back 352's had FMX's but it could be either best way to tell is crawl down there and look at the transmission pan if it a L shape then its a c6 if it more square then it a FMX i seriously doubt it's a C4...hope that helps.....

truckjunky87 · Post by **truckjunky87** » Tue Nov 16, 2004 9:11 am

According tho the oil pan it is a C6 but in everything I have read on the FMX came with a V8 in '67. But judging by a partially removed cross member the C6 was added later. The problem now is the thing leaks but I think it is just the pan gasket.

MudinMan4x4 · Post by **MudinMan4x4** » Tue Nov 16, 2004 11:42 am

i'm sure you know this but pan gasket is a super easy fix...can pick one up for a c6 at any parts store....you prolly know that though....considering your familar with chevys....(week drive trains)....

so am I...

just a thought...

flyboy2610 · Post by **flyboy2610** » Tue Nov 16, 2004 9:26 pm

Just be sure you do noy overtighten the pan bolts on that C6. The original pans were made from thin sheet metal and overetightening the bolts will distort the flange, making it nearly impossible to get a good seal.
You can get a pan made of thicker steel here:
http://www.c6-c4.com/

jjsuave · Post by **jjsuave** » Mon Jan 10, 2005 3:40 pm

My 67 F100 original has a 352 and C4 from the factory. The rating plate crosses over to a C4 in the 67 ford truck service manual also.
I'll be upgarding to a 390 and C6 soon.

68F250 · Post by **68F250** » Mon Jan 10, 2005 4:16 pm

Ford never made a C4 to mate to the FE series engines, it's gotta be a MX (heavy duty version of the FMX) tranny, the code on the rating plate only means an automatic, does not specify which one.

jjsuave · Post by **jjsuave** » Mon Jan 10, 2005 7:24 pm

I stand corrected... After crawling under there it is not a C4 on my 352. The shop manual codes it as "automatic C4" but that's probably because there is no code for a MX-HD which is what I have.

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