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Old 07-21-2003, 09:33 AM
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Ford C4 - Light Duty Truck v Mustang

I have heard there is a difference between the Ford C4 for light duty trucks and regular cars. If this is so, could I also assume the torque converter might be different? Is there a difference in any other way?

I'd like to follow up with a rear end question. Are there any differences between a Ford 9" mated with a 360/390 C6 and a Ford 9" mated with a 351-C/C4?

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Old 07-21-2003, 02:06 PM
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Cool

The heaviest duty C4 is the one with the pan fill dipstick. The dipstick tube goes into the pan, instead of the case. The case is stronger and the forward clutch has more frictions and steels. This trans takes a 167 tooth flexplate, while the car version takes a 157. Pretty sure the tc wouild be different also.
On the 9" question, the major differences in stock form is if it has 28 or 31 spline axles. If it has the heavy duty housing, it more than likely has 31 spline axles.
What are you going to put in front of this C4 and 9" and what purpose will it see?
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Old 07-21-2003, 02:17 PM
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Its not so much what I am going to put in front of the C4 and 9", its what is already there.

I have a light duty 1/2 ton, but the engine and trans are a 1970 351-C/C4 swap from a mustang. The rear end in the truck is the stock 9" that was mated with a 360-2bbl, I believe it is the 31 spline variety. I was thinking that a light duty truck C4 and TC would serve the purpose better than the Mustang C4 and TC that is there now.
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Old 07-21-2003, 05:21 PM
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There is a difference in the output shafts between the trucks and cars. The teeth for the speedo with a C-4 are part of the output shaft. Generally the number of teeth on a truck is different from a car because of the gear ratio in the rear-end. At times it makes it difficult to get the speedo to read properly if they are exchanged for one of the wrong number of teeth.

The number of clutches in the drums depends on which drum is in the case, and which engine it was supposed to go behind originally. If anyone has even been inside that trans, it could have any number of clutch drums in it, as they are interchangeable.

I have never counted the teeth on a flex plate. There were several different convertors that were used. It depended on which engine was used, being 4-cyl, v6, small in-line 6, large 6(300 CI), and V8. There was also an early versus late versions that was determined by the number of splines on the input shaft.

Hope that helps
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