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Old Jul 10, 2009 | 09:52 PM
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Woodsman_30350's Avatar
Woodsman_30350
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From: Comfort, TX
C4 Modulator Question

I have a C4 tranny on my 351W that I installed in my 1950 F-1. After four years I finally got it on the road and the tranny shifts fine but the shift points are way too high. I took in into a good tranny shop and the owner pointed out that I had a non-adjustable modulator (push-in) but it has a side entry port for the vacuum hose.

We want to change it to a adjustable modulator but the hose enters in the rear. Does anyone know where I could find the bracket that holds this type of modulator in place?
 
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Old Jul 10, 2009 | 10:05 PM
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Woodsman_30350
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From: Comfort, TX
Sorry, wrong forum.
 
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Old Jul 10, 2009 | 11:10 PM
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NumberDummy
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Originally Posted by Woodsman_30350
I have a C4 tranny on my 351W that I installed in my 1950 F-1. After four years I finally got it on the road and the tranny shifts fine but the shift points are way too high. I took in into a good tranny shop and the owner pointed out that I had a non-adjustable modulator (push-in) but it has a side entry port for the vacuum hose.

We want to change it to a adjustable modulator but the hose enters in the rear. Does anyone know where I could find the bracket that holds this type of modulator in place?
Since you have a 1950, I'd say you are not in the wrong forum.

Did you buy the engine and trans as a unit?

Most 351W's did not use the C4.

What did use a 351W/C4 combo was 1973/76 Torino's, not something you may be able to find today in a junkyard.

I looked for a modulator valve bracket in the parts catalog for this application, there isn't one listed.

On the left side of the case, near the servo cover is a tag that has the FoMoCo trans code on it...is it still there?

If so, post the code. I can then tell you what the trans is from, what mod valve it uses, and etc.

btw: Inside the modulator valve is a replaceable rod. There is more than one length, which varies the shift points.

Did the trans shop point that out?
 
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