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Old 10-22-2007, 11:39 AM
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C4 Vs. C6

Ok, so i'm running a 351C in a 68 Mustang w/ 600+ horses and i was wondering which trany to use. I have the C4 already b/c it came behind my stock 1968 289. I didn't know whether to keep it and rebuild it or buy a car C6 and rebuild that.

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Old 10-22-2007, 04:39 PM
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I've heard of C4s that were built to take a lot of power, but obviously it wouldn't be cheap. The main advantage would be less weight overall and less parasitic power loss compared to a C6. But the C6 is already a damn tough unit to begin with and if it were me, I'd use the C6, modified to withstand your power level of course.
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Old 10-22-2007, 04:49 PM
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Go to fordmuscle.com they have info on the C4. A well built C4 will take about 900hp. They show all the mod's for improving the trans. including doing a roller conversion. TF
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Old 10-22-2007, 05:53 PM
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i would go with the c-6 make sure to get a p-code servo or an aftermarket servo and get the 5 clutch direct/reverse drum with the heavier tranny that just means you need more power
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