FMX Transmission Questions - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 54 (permalink) Old 03-12-2017, 06:45 AM Thread Starter
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FMX Transmission Questions

Is there a specific FMX forum anywhere? I am have no first gear in mine behind a mildly built 390 or, in other words, it takes off in second gear and I have to lift a little to get it to shift into 3rd. The car has a B&M star shifter and it is adjusted correctly. I would like to fix what I have so I am pulling the pan to change the fluid and make an inspection of the innards. I did find a huge vacuum leak so i am working on sealing the intake up and replaced the vacuum advance that had a huge hole in. My question is where can I find the modulator? The kits I see don't have one and I can't seem to find one that would work.
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post #2 of 54 (permalink) Old 03-12-2017, 08:32 AM
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Re: FMX Transmission Questions

The stock AT in a 65 with an FE was a MX. Of course you or your PO could have changed it out. But the stock 65 modulators are fairly common. My MX did the same thing and I tried several fixes including new modulator, fluid and filter, band adjustment, checking some valves, all to no avail. By then I was obsessed. I got a reman for $800 which has all three gears, but leaks.

Long story short, I don't feel much performance and I'm not sure I'd bother with it if I had the chance for a do-over.

To every man upon this earth
Death cometh soon or late.

Putts drives a 1965 Galaxie. Rebuilt 390, 4100 on a Performer, MX, AC, PS, PB w Scarebird front discs on Cragar 17" S/S.
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post #3 of 54 (permalink) Old 03-12-2017, 01:03 PM Thread Starter
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I would change it for a C4 or C6 if I could find one with the right bell housing. I would also be open to changing it over to a 4 speed if I could find all the right parts at a reasonable price. I will play with it a little and see if I can get it working and try to find a different trans. Do you know if the C4 or C6 will require a new driveshaft yoke?
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post #4 of 54 (permalink) Old 03-15-2017, 03:56 PM
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Re: FMX Transmission Questions

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Originally Posted by 65Galaxie_390 View Post
Is there a specific FMX forum anywhere? I am have no first gear in mine behind a mildly built 390 or, in other words, it takes off in second gear and I have to lift a little to get it to shift into 3rd. The car has a B&M star shifter and it is adjusted correctly. I would like to fix what I have so I am pulling the pan to change the fluid and make an inspection of the innards. I did find a huge vacuum leak so i am working on sealing the intake up and replaced the vacuum advance that had a huge hole in. My question is where can I find the modulator? The kits I see don't have one and I can't seem to find one that would work.
There is a transmission forum on Network54. Google Ford Transmission Forum. I ordered my modulator from bulkpart.com. I just looked and they don't have it on there anymore.

This is a silly question and you may have already tried this but have you tried taking off with the shifter in the "2" position. The position that is next to neutral on the aftermarket shifter will be "D" but on my car that is the "white dot", which starts off in 2nd. The next position, which would be "2" on your shifter is the "green dot" originally and should start off in first gear.

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post #5 of 54 (permalink) Old 03-15-2017, 08:09 PM Thread Starter
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My car has an aftermarket B&M shifter so it doesn't use the factory shift. I crawled under and put it manually in first gear which still takes off in second. I made sure the shifter was adjusted correctly. I really need to pull the pan and see what is going on.
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post #6 of 54 (permalink) Old 03-16-2017, 05:02 AM
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Re: FMX Transmission Questions

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Originally Posted by 65Galaxie_390 View Post
My car has an aftermarket B&M shifter so it doesn't use the factory shift. I crawled under and put it manually in first gear which still takes off in second. I made sure the shifter was adjusted correctly. I really need to pull the pan and see what is going on.
Regardless of what aftermarket shifter you use, the shift pattern of the transmission will remain as it came from the factory. That would make the gear identifiers on the aftermarket shifter irrelevant.

On another note, do you have any pics of your shifter installation and is your car bench or bucket seats? I've been thinking about adding a floor shifter to mines.

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post #7 of 54 (permalink) Old 03-16-2017, 07:02 AM
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Re: FMX Transmission Questions

Hello 65Galaxie_390,

There's still a great deal lacking on background information to help conclusively, but on the assumption that the transmission is either the original for the car or a pre-'67 original model transmission, then it uses the green dot, open dot (or no dot) drive shift pattern and what would normally be "Drive" on an aftermarket shifter is actually open/no dot and starting off in second is normal.

What would be "2" on your aftermarket shifter would be normal drive for these transmissions.

Again this is based on the fact that the transmission is an MX or FX and '66 or older. Since the FMX debuted in '68 it would have what is considered to have a modern shift pattern --> PRND2L and if you have this transmission then you have other troubles such as suck governor valve on tail shaft (somewhat common problem), valve body problems, etc.

Cheers
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post #8 of 54 (permalink) Old 03-18-2017, 08:56 AM Thread Starter
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So if I understand correctly, the 2 position would be normal "drive" if it is am MX? If I put the transmission into 1 or low, it should still go into 1 correct?
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post #9 of 54 (permalink) Old 03-18-2017, 09:02 AM Thread Starter
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There is still a lot on the car that I am working on fixing from neglect and I am not so sure the B&M Star shifter for the C4/C6 is the best choice. However, all the factory linkage and column shift is missing so I am not left with much choice. Anyone else have a B&M on their FMX?
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post #10 of 54 (permalink) Old 03-18-2017, 10:37 AM
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Re: FMX Transmission Questions

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So if I understand correctly, the 2 position would be normal "drive" if it is am MX? If I put the transmission into 1 or low, it should still go into 1 correct?
Yuppers, position "2" would be normal drive "green dot" on a pre '67 automatic transmission on the galaxies/Customs/LTD's. It doesn't matter if it's an FX, MX, C4, or C6. Like I mentioned earlier if you truly have an FMX transmission, since those debuted in 1968 then it's the modern shift pattern and your shifter nomenclature will be correct.

It's easy to tell if you have an FMX or an MX/FX series trans. If the trans fill pipe (dipstick tube) goes into the pan itself it's an MX/FX series, if the fill tube goes into the side of the case it's an FMX.

On the 'L' position of the pre'67 automatic transmissions, it can either hold second gear or first gear depending on speed and throttle position, so it's not totally the same as '1' on your shifter.

The pre '67 transmissions are called "Dual Range" and are kind of funky compared to the later more standardized ones.

Cheers,
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post #11 of 54 (permalink) Old 03-18-2017, 07:37 PM Thread Starter
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Well sir, that would certainly answer a lot of questions. My tube runs directly into the pan and I just bought a non-returnable pan gasket and filter for an FMX which I can only assume won't work. You have been extremely helpful with this and I thank you. I am not sure what to do now since all the linkages are missing and it sounds like the kickdown cable is pretty important. The engine is more than stock so I may try to find a C6 with a stall or try to put a 4 speed in it. Thank you again for the information!
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post #12 of 54 (permalink) Old 03-18-2017, 11:53 PM
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Re: FMX Transmission Questions

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Well sir, that would certainly answer a lot of questions. My tube runs directly into the pan and I just bought a non-returnable pan gasket and filter for an FMX which I can only assume won't work. You have been extremely helpful with this and I thank you. I am not sure what to do now since all the linkages are missing and it sounds like the kickdown cable is pretty important. The engine is more than stock so I may try to find a C6 with a stall or try to put a 4 speed in it. Thank you again for the information!
Hello 65Galaxie_390,

My pleasure to help. You said you're not sure what to do as you are missing parts. Perhaps if you post a couple of pics of what you have and what you want to do we can help further. Pieces like the kick-down cable, well actually it's a rod (tube), is easy to duplicate with 1/2" OD aluminum tube, a 1/2" tubing bender, hammer, file and drill. Not to mention a picture to get the general idea of its shape. There are typically two length kick down tubes, one for a 2bbl and one for a 4 bbl carburetor.

But I am curious as to what transmission you have, either the FX or MX. The FX is the lightest duty automatic out the bunch. If yours is the FX and your 390 is not stock, then I'd look for a C6 or MX. If it's an MX and it actually works, then I'd just see what parts are needed and use it.

Trying to find the medium length tail shaft C6 with an FE bolt pattern housing is getting harder and harder to find. Not to mention when you do find it, it's probably been sitting and needs to be refreshed for reliability. So the costs go up quite a bit since these parts are in the 50 year old category.

Just thoughts...
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post #13 of 54 (permalink) Old 03-19-2017, 05:42 AM Thread Starter
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I will crawl under there sometime today and see if I can find a tag or at least take some pics. With the cam it has in it, it should really have a stall converter, but do they make one for the FX/MX? I don't want to overdo this because it really is just a street cruiser and have no plans on racing it. I have another car for that purpose. Again, this into is very helpful.
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post #14 of 54 (permalink) Old 03-19-2017, 08:45 AM
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Re: FMX Transmission Questions

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I will crawl under there sometime today and see if I can find a tag or at least take some pics. With the cam it has in it, it should really have a stall converter, but do they make one for the FX/MX? I don't want to overdo this because it really is just a street cruiser and have no plans on racing it. I have another car for that purpose. Again, this into is very helpful.
Hello again,

The FX and MX look so close to one another it's hard to tell the difference from the case but the pan is slightly different. Here's a link to look at if you cannot find a tag or it's missing.

Ford Transmission IdentificationPan gaskets and filters for C

As for the converter regarding stall. That's the main problem with these older Borg Warner designed transmissions (FX, MX and FMX) is that aftermarket parts and upgrades are slim to non-existent, unlike the C4 and C6. I rebuilt an FMX for a friend and he had a heck of time getting just rebuild parts. He had to send his bands in to get relined sort of thing because no one is making the bands from scratch.

Your best bet, if you have an MX and decide to stick with it, is to call around to some aftermarket trans places and see if you can send them your old converter and they can slice it apart, clean it, alter it for the stall you want, then they can re-weld it and balance it for you.

Even torque converters for the C6 mating to FE's apparently are getting scarce as the place I bought two rebuilt stall converters with Torrington upgrades required a core charge on the old converters, so I had to send them my two old ones, which is something you usually do not have to do for other transmissions.

As for rebuilding the FMX, after rebuilding a couple 700R4's, building up a 4L60E, a TH-400 and 2 C6's I was less than impressed with the construction and size (torque capacity) of the parts of the FMX. That's just my opinion though.

Good luck and keep us posted.

Cheers.
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post #15 of 54 (permalink) Old 03-19-2017, 03:55 PM Thread Starter
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Ok, here is what I have. Trans numbers are stamped upside down, but read C5AP 7006 A on the driver's side. The pan has 14 bolts and is pretty much a rectangle. Fill tube is in the pan as you can see. I really don't know what I have to be honest. I can't find any other tags on it.
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