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Was curious what the difference between is between a C4 and a C6 transmission. I have a Straight 6 250 as well as 2 200's with transmissions attached to them how do I tell if it is a C4 or C6?


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C6 tranny pan looks like the state of utah kinda the c4 is a square shape.The c6 was used in big blocks and the Cleveland/Modified engines never any inline 6 ever.Short answer its a c4 a c6 won't bolt on a inline 6.
 

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The C4 has a separate bellhousing, C6 it's part of the trans. I really doubt that you'll ever see a C6 transmission mounted to the Ford "small" inline six. They are found on the truck inline sixes, which are larger engines dimensionally.
 

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C6 tranny pan looks like the state of utah kinda the c4 is a square shape.The c6 was used in big blocks and the Cleveland/Modified engines never any inline 6 ever.Short answer its a c4 a c6 won't bolt on a inline 6.
not always true.... they do use a c6 tranny on a 300cu inline 6 and a 302 v8....and ya its in a truck...
 

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The C6 trans definitely will NOT fit up to a 200 CID, but it MIGHT fit onto the 250. I've not tried that combination, but, since the 250 engine uses the small block V8 bell housing, I would not see why the small block version of the C6 could not be adapted. All that palaver being said, IMHO, I see no reason to make the C6/250 CID engine combination. The tranny is a power robbing monster best used behind high torque power plants used for heavy towing. The 250 really doesn't have any horses to spare; in fact, I see no good reason why the 250 would be used in place of the 200 or the 302-5.0 engines. It has the power of a six with the economy of a V8.
Best,
Al
 
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