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Old 04-21-2003, 09:10 PM
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Question C4 torque converter question

I've got a '65 Mustang with a 289, Comp Cams 270H camshaft, 625 cfm Carter Carb, Headers and Flowmaster 40 Series exhaust. After putting that much cam in the car, the low end is kind of disappointing. I am debating between going to a smaller cam or a stall converter for the one I have. The only problem is that it is a C4 from 1965, and all catalogs I see say they are for 66-up applications. What is the difference between a 65 and 66 C4, and can I bolt the 66 application to a 65 transmission. Also, I want to know if converter is a better idea than the cam, the car is a daily driver and I need decent gas mileage, I want to stay in the 15 mpg highway range that I'm getting now. I was happier with the stock cam than I am now, but only because of the low end. Will I see more power with a smaller cam or the converter?

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Old 04-22-2003, 05:41 AM
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I'll have to check my books but I think the converter will work on the earlier trans, they did have a different shift pttern on the early one and that may be the reason the don't list it. I think you would be better off with a smaller cam, since most stall converters slip more and that equates to worse mileage. If your trans has the old D2,D1,l pattern it is older, if it has the 1,2,D pattern it's later or has had the later valve body and shifter installed.
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Old 04-22-2003, 12:21 PM
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I would honestly go with a smaller cam. Youll get pretty bad mileage with a new torque converter, it slips all the time. I had a 2200rpm non lockup converter in my AOD, and I recently switched to a T5, and the mileage on the freeway is a huge difference...even though it cruises at the same RPM.
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Old 04-22-2003, 02:15 PM
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Thanks for the help guys. I was thinking about the cam change, I am definately going to do that over the summer. By the way, if you're curious, it's the older model with the D2, D1, L pattern.
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Old 04-22-2003, 02:52 PM
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You might consider switching to a later 3-2-1 valve body. The rerouting done to make it shift like that also aids in trans power capabilities and longevity. If you're interested I can check which ones fit, but it's my recollection that virtually any up to about '75-'76 will bolt right on. They only offer a shift kit for the later style and I'd add one of those at the same time, the trans will shift nicer and it can help mileage.
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Old 04-22-2003, 08:07 PM
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^^yup, what he said.^^
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Old 04-23-2003, 03:15 AM
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If it's the factory transmission that came in your 65 use drive 2 white dot on shifter will take off in 1st gear, shift to 2nd then 3rd. If some one has changed the valve body or transmission this wont work for you, drive 2 will be 2nd only.Change your cam increase your stall will cut mileage down not for everyday driver car.
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Old 04-23-2003, 04:46 PM
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Someone else may be able to verify this, but I think there were 2 different input shafts in the C-4 also. They had different splines. Not really shure, but think 1 was 26 and the other was 24 or something like that. Can't remember for sure. Age does that to you. Airworld.... can you help with that?
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Old 04-23-2003, 05:46 PM
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My book starts at '66 too.
'66-'69 24 spline
'70 & up 26 spline


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Old 04-23-2003, 06:07 PM
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I also like the idea of going with a smaller cam. Something like the Xtreme Energy XE256H would provide much more off the line torque and better manners on a street driver.


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Old 04-23-2003, 08:11 PM
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Thanks for the help. I've decided to leave the converter alone and get the cam-about that Xtreme Energy-are they good for power? I've been debating between the XE250H and XE256H, the only thing that worried me was that the valves open and close so quick-they're not hard on valves, are they?
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Old 04-24-2003, 05:23 PM
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[quote]the only thing that worried me was that the valves open and close so quick <hr></blockquote>

No quicker than any stock cam. The springs apply the closing force, the cam profile just makes it happen earlier or later.


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Old 04-24-2003, 05:28 PM
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I was thinking the car would have a green dot valve body.

If the tranny is a 1965 it will have the 24 spline input.

Later units were 26 spline from 1970 & up, I believe.
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