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  #1  
Old 06-27-2017, 10:10 PM
RustyNCa RustyNCa is offline
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Default FMX to C6 question

Does anyone know, can you run the flexplate from the Cruise-a-matic to the C6 converter. IE, can I just leave in the flexplate that I have in there, or do I have to change it out?

I'm already running a 390 with a later style starter, but I don't remember if I changed the flexplate back when I swapped out the motor.

Cheers and thanks for any help.
RustyNCA


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  #2  
Old 06-27-2017, 11:52 PM
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jopizz jopizz is offline
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If you are using the later starter then you have to have the later flexplate. They are not interchangeable. It should work fine in the C6.

John
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Old 06-28-2017, 12:51 AM
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Quote:
Originally Posted by RustyNCa View Post
Does anyone know, can you run the flexplate from the Cruise-a-matic to the C6 converter. IE, can I just leave in the flexplate that I have in there, or do I have to change it out?

I'm already running a 390 with a later style starter, but I don't remember if I changed the flexplate back when I swapped out the motor...
I have to look at your question backwards to understand it. You're running a 390 w/late starter motor. Now, you want to know if a C-O-M will fit?

Flex plates and converters simply bolt together with four studs/nuts.

C6 comes with its own integral bell housing (with starter motor bolt holes in it). Depending on what size car the C6 came out of it could use either the 157 or 164 tooth flex plate. Squarebirds with a C-O-M used a flex plate with 153 teeth and 15"-diameter.

If you're not sure, do a 'mock-up'... Outside the car, mount the starter to the bell housing and mount the flex plate to the torque converter. Now slide the torque converter into the transmission's input spline and see if the starter teeth mesh. The difference is 1/2" in flex plate diameters.

You could also count the teeth on your flex plate. 153 teeth fits a C-O-M bell housing. - Dave
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Old 06-28-2017, 01:26 AM
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To use the later starter your flexplate has to have 184 teeth. Thunderbirds in 1965 and 1966 used the same flexplate whether they had a COM or a C6.

John
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  #5  
Old 06-28-2017, 08:52 AM
OUR5T8BIRD OUR5T8BIRD is offline
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Quote:
Originally Posted by jopizz View Post
To use the later starter your flexplate has to have 184 teeth. Thunderbirds in 1965 and 1966 used the same flexplate whether they had a COM or a C6.

John
John, is there not a difference for '66 if it was a 428 having to do with balance weights on the flexplate ( or drilled weight balance holes ? .
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Old 06-28-2017, 10:02 AM
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Quote:
Originally Posted by OUR5T8BIRD View Post
John, is there not a difference for '66 if it was a 428 having to do with balance weights on the flexplate ( or drilled weight balance holes ? .
Yes, the 428 does use a different flexplate than a 390.

John
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Old 06-28-2017, 12:08 PM
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[quote=RustyNCa]Does anyone know, can you run the flexplate from the Cruise-a-matic to the C6 converter. IE, can I just leave in the flexplate that I have in there, or do I have to change it out?


You will need to buy the correct flexplate for the C6 (1966 thru say 1970 car application & thru 1977 for light truck), as the converter offset (depth) for the earlier MX, FX and FMX family of transmissions (if this is what you are indicating you have with the description "Cruise-a-matic", as Ford applied this vocabulary to several different units over the decade) and C6's are different.

No ifs, ands, or buts!

Scott.

Last edited by pbf777 : 06-28-2017 at 12:26 PM.
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Old 06-28-2017, 01:05 PM
RustyNCa RustyNCa is offline
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I guess how I worded it was confusing, but I think I may understand your answers.

My 58 had, well still has, a 390 in it with a modern starter, but running the original transmission. That transmission and I think primarily the converter finally started giving up after all these years.

So I have pulled the trans and have a couple C6 transmissions, with converters and flywheels sitting in the corner. One C6 came with a Mercury 410 motor I have, the other is from a pickup truck.

I was just wondering if anyone knew if the flywheel I already have on the motor would work with the C6. If not, I do have the flywheels that came with each C6.

Thanks for the help.

RustyNCA
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Old 06-28-2017, 02:07 PM
pbf777 pbf777 is offline
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You will need to use a flexplate that is appropriate for the C6, but not the units for a 410 or 428 cu. in. engines as these carry counter weight not applicable to your 390 cu. in. engine.


Scott.
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  #10  
Old 06-28-2017, 08:29 PM
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Quote:
Originally Posted by pbf777 View Post
You will need to buy the correct flexplate for the C6 (1966 thru say 1970 car application & thru 1977 for light truck), as the converter offset (depth) for the earlier MX, FX and FMX family of transmissions (if this is what you are indicating you have with the description "Cruise-a-matic", as Ford applied this vocabulary to several different units over the decade) and C6's are different.

No ifs, ands, or buts!

Scott.
If that's the case then how come the flexplate you mention has a 1965 part number (C5AZ6375D). Ford didn't use the C6 until 1966. They were still using the COM in 1965. Just asking.

John
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