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Mustang Technical Discussion > Pre 1973 > C4, C10 AND C6 Difference > Community Forums > Mustang Forum Australia - Mustang Tech

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C4, C10 AND C6 Difference Reply to topic

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Mustang Star

Joined: Mar 04, 2011
Posts: 499
Location: Sydney

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I'm wondering what the difference is between the c4,c10 and c6.
And do they all fit the 67 and 68 mustangs without any modifications etc.?
As far as my research so far is that the c4 and c10 are similar but the c10 is slightly stronger.
The c6 however is a different beast: it is stronger again, and it was used to bolt up behind big blocks:
Q: Will it bolt up behind a small block? like a 302 etc? Question

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Mustang King

Joined: Jul 27, 2010
Posts: 8554

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Yes.. I have a C6 at home which was originally attached to my engine.

The C6's are strong boxes, but they are rumoured to sap more power than the C4 because of the larger drums etc.

As with many rivalries in the performance world, there are C6 guys and there are non C6 guys.

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Mustang King

Joined: Jul 31, 2010
Posts: 4230
Location: Can someone send me some of that "Clean" coal for my furnace. My wood has frozen..

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C10's are later C4's. They are identified by the dipstick tube is located in the sump not the case like the early ones. The C10 shift pattern is different in that there is no "snow" drive, other than that they are basically the same box. The C6 is heavier and as Hybid stated they are stronger and do sap a lot more power than a C4 but a C4 can be built to handle in excess of 600hp.

My Motto - Don't get Caught! If you do, Blame Someone Else!

MUSTANG - Fantastic Not Plastic

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Mustang Star

Joined: Mar 04, 2011
Posts: 499
Location: Sydney

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What about application: can the C6 bolt onto a small block such as 289,302 etc.?

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Mustang Maniac

Joined: Jul 28, 2010
Posts: 1259
Location: WILD WEST - SOR

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Yes, but you have to get one with a small block bell housing..
They are not removable on a C6..

From wikipedia:

Five different bell housing varieties exist for use with various Ford engine families:
The Windsor pattern was used on the 300 I6, the Ford Windsor engines and the 351 Cleveland.
The Cleveland pattern was used on the 351M and 400 versions of the Ford Cleveland engines and all of the Ford "385" engines.
The FE pattern was used on the FE engines
The rare 66 - 68 Lincoln MEL 462 pattern which was used on 66 - 68 Lincoln Continentals with the 462 engine and also on 68 - 70 Lincoln Continentals with the 460. This pattern rounds off on the passenger side to clear the heat/AC box on the 66 - 70 Lincoln firewall.
Diesel pattern. This was similar to the FE/"385" pattern but the two are not interchangeable.

Dodgy Bros. Customs

Suspect 67 - www.mustangtech.com.au.../t=52.html

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Mustang Star

Joined: Sep 12, 2010
Posts: 439
Location: Sydney

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Easiest way I find to distinguish is a C6 doesn't have a bolt on bell housing and the following for the C4 and C10:
รขโ‚ฌยขC10 dipstick/filler tube enters the side of the transmission sump.
รขโ‚ฌยขC4 dipstick/filler tube enters the topside of the transmission housing.
รขโ‚ฌยขC10 has a smooth transition between the Bell Housing and Transmision Housing. (see pics)
รขโ‚ฌยขC4 has a step up between the Bell Housing and Transmission Housing. (see pics)

C4 on the top and C10 on the bottom.

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