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I am in the process of doing a 1978 King Cobra Restomod project. I know nobody likes the Mustang II. :( Anyway I started this project almost 2 years ago. I have a 347 stroker ready to go in. I purchased a rebuilt C4 set up to handle big HP for it about 2 years ago. Since the project was on hold for a long time I have forgotten all the specs on the C4. I thought I remember it as having a standard automatic valve body. However I took it off the shelf yesterday to get it bolted up to the motor and discovered a couple of things that make me wonder. There is no kickdown lever installed and the vacuum modulator hole is plugged with a freeze plug. This all makes me believe that is has a reverse manual valve body. Is my assumption correct? There is no way a C4 can shift automatically with out a VM, correct? If my assumptions are correct, what are your guys opinions of street driving a manual VB? Any input would be greatly appreciated.
 

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This is not my area of expertise but without the modulator you are going to have very high line pressure all the time and yes it would definitely be a full manual valvebody. With the modulator you would have low line pressure at light load or cruise. Not a good combo for a street car. I would change the valvebody, knock out the freeze plug and add a modulator and buy the lokar kickdown cable set up. Or if you replace the trans get one from BTE, They usually have a good price on the c-4
 
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