Transmission Question Mustang 71

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My son has a 351c 1971 Mustang Grandι (looks like a fastback). We need an automatic transmission. The guy he talked to asked if the transmission has a steel case (fmx tranny). So, he put a magnet on it and it
was steel. He said this is an expensive tranny to fix, buy and find. so he offers to rebuild it w/towing for a hefty fee. My question is: what models of automatic transmissions w/fit in it and either slightly or not have to be modified, or is he yankin' his chain. Thanx in advance, Doug
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a C-6 will bolt rite up to the 351C and is a lot easyier to find and fix
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You mean a C4, as that the 351 has the small block transmission bolt configuration.

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Thomas Moats wrote:

C6's come in small-block patterns as well.
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But are VERY hard to find. Because of that expensive.

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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.
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Thomas Moats wrote:

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.
http://www.bulkpart.com

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Don't doubt you, but my experience has been that the C6 with the small block bolt pattern hard too find. Maybe it depends on area?

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Thomas Moats wrote:

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.

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Vans _and_ pickups. Remember that the Ford F series is the best selling vehicle in the US, so just about any pickup in the 70's and 80's with a 351W will have a small block C6 behind it. They're everywhere.
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351 C came with a C/6 351 W came with the C/4
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Falcoon wrote:

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
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snipped-for-privacy@bob2000antispam.com wrote:

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??? ;-)

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C4 will bolt to it. The FMX is not all that hard to find nor is real expensive to recondition. Suggest you check around.

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wrote:

Not to mention that a C4 isn't exactly horrible to rebuild, (assuming you get a good tranny book & the right tools, ) -LMB Ace of Spades in the NG Evil Cabal pack of cards! Take the High Road!!! Vist http://www.thehighroad.org
Words to live by:
Save the trees...wipe your butt on an owl. Fight crime...Shoot back Eat well, Stay fit, Die anyway. Never underestimate the power of stupid people in large groups.
What has 4 legs and an arm????????? A happy pit bull.
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ddocken wrote:

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
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On Sat, 06 Sep 2003 11:56:17 -0500, ddocken

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.
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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
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Jason James wrote:

All 3 speed Ford transmissions (FMX, C3, C4, C6) from 1967 and up have this gear feature in manual 2nd.
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traffic
no
this gear

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