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Old 01-31-2006, 01:29 AM
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Modulator Valve - '65 Mustang C4

Can anyone give me a detailed description of removal and installation of a modulator valve for a C4 tranny? I figured it wouldn't just be back the old one out, and screw the new one in... Thanks!

~Stanger

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Old 01-31-2006, 05:44 PM
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You're pretty close with screwing one out and the new one in. You have to be sure that the activator pin is still in the tranny and insert it into the modulator. Most modulators can be adjusted through the vacuum fitting with a little screw driver if you want to alter the shift "feel".
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Old 01-31-2006, 08:14 PM
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Alright I got it installed, the pin is in there, everything's good, but it's still not shifting right. (Or at all, really) When it gets to the point where it should shift, it feels like the engine is pulling towards the radiator, and the car starts to slow down. I shortened up on the kick-down so that it would kick easier, but still nothing. Also, I didn't wait for the transmission oil to completely drain after I took the old modulator valve out, I just pushed it in to stop the leak, was that a bad idea?
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Old 01-31-2006, 10:29 PM
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what is the history on this trans?

mileage, rebuild recently, if you know.

Could this be a poor running engine problem?
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Old 01-31-2006, 10:32 PM
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Just replaced the engine =) I don't actually know the history of the tranny, but from what I know about hte guy I bought it from, he didn't do much to it. I'm going to take it to a tranny shop and have them give me a free diagnosis, and if I can fix it myself I will. It shouldn't be too hard. I have the shop manual so that pretty much tells me everything that's going on. Should I have drained the transmission before installing that modulator valve?
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