Transmission Question Mustang 71

a C-6 will bolt rite up to the 351C and is a lot easyier to find and fix

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C6's come in small-block patterns as well.

Gerard

Did he put the magnet on the CASE, rather than the trans pan? All stock pans are steel...Another feature of the FMX is that it has ears and 4 external bolts holding it to the bellhousing. I disagree with the above statement of the trans being expensive to repair and to find...there are still many tens of thousands of them still running in all types of 60's and 70's Fords.

Anyhow, any good transmission shop should have no problems rebuilding an FMX, C4, or C6 transmission, whichever you have or you choose. With a stock engine, the FMX is a fine unit, and should give years of good service.

Gerard ASE Certified Master Auto Tech Ford Trans specialist

The FMX seems to be more expensive to build because they generally sustain more damage in a failure. The FMX is a strong reliable trans. A good shop should be able to build it unless the case is damaged which was not uncommon for them. The C4 trans is the aluminum unit used in many of those cars and will get the job done. It will not stand the abuse that a C6 can behind that engine. The C6 is a bit heavier that the C4 and requires a bit more engine power to handle it. As long as the case is not damaged and the car is driven sanely(?), I would opt to build the FMX. The others will require other mods to complete the job which will add to repair cost. If money is no problem and it is a performance vehicle, the field is wide open for improvements.

Also the FMX has a feature which is invaluable coupled to a 351c in traffic ie it can take-off in 2nd if you so desire and stays in 2nd, so there's no change-up--stop--moveoff-change up etc etc.

Jason

Not at all...actually, in the late 70's through the 80's, when big blocks began to become less common, the small block C6 was put behind almost every van and pickup with a 351W engine. Lots of them out there. I rebuilt one out of a van for a buddy of mine.

Gerard

All 3 speed Ford transmissions (FMX, C3, C4, C6) from 1967 and up have this gear feature in manual 2nd.

Gerard

351 C came with a C/6 351 W came with the C/4

Not exactly true. What years and models are you talking about? In many years and applications, 351W's came with FMX and C6 transmissions.

Gerard TS 14

OK,.I thought it was exclusive to the Ford 'selecto-matic' trans?

Jason

I can't remember if my AOD's had this feature, I think they did, but the AXOD and A4LD have the second gear start too.

Rob

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They are very common, unless your local junkyards are empty of 1970s cars. They were used throughout the 1970s. Look in any 1970s Ford intermediate. Trans code X. Parts for stock rebuilds are also common. Parts for Hipo apps are not so easy to find, and that is where I suggest moving to the C6 or C4.

BTW, have you been to Makco? Tons of trans parts for good prices.

351Cs were equipped with C4s from the factory. My 1973 Montego was so equipped. After 1974, the 351M came with C4s. Where do you think those Ford factory 460 to C4 bell housings on Ebay come from? I have one in my garage right now. The FMX was used behind 351 Cs, Ws and FMXs. Sometimes, your Ranchero with 351C-2V came with an FMX, sometimes it came with a C4. Sometimes it came with a C6. C6s were used behind 302s in Vans. Hard and fast rules, Falcoon? For Ford? Are you kidding??? ;-)

Pardon me, I failed to follow the thread. I thought the topic at this point was still the FMX. You are correct that the smallblock C6 is not common, but do keep the vans in mind. They are a regular source.