Correct Color Stripe For My C4 Modulator Valve? - Vintage Mustang Forums
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Old 11-01-2011, 05:22 PM   #1 (permalink)
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Default Correct Color Stripe For My C4 Modulator Valve?

'68 Mustang convert w/'69 351 & auto trans. Went to the parts store to get a new modulator valve and they have 4 different valves, each with 4 different color stripes. Any idea which is the one I need? Thanks
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Old 11-01-2011, 07:41 PM   #2 (permalink)
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Assuming your trans is a 68, it should be the white stripe, screw-in one.
Hope this helps.
- Chris
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1967 Ford Mustang Coupe SS(Sports Sprint), 289 "C" Code, PA C4 Auto Trans, Fully Restored, Sauterne Gold w/ Black Vinyl Roof and Black Interior w/ Console, Edelbrock Performer 500 cfm carb, Pioneer radio,
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Old 11-01-2011, 10:32 PM   #3 (permalink)
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Quote:
Originally Posted by 67Mustang Coupe View Post
Assuming your trans is a 68, it should be the white stripe, screw-in one.
Hope this helps.
- Chris
Hi Chris-I was told that the modulators come in 4 different striped colors:

White
Red
Black
Green

It was also explained to me that a 'screw-in' style modulator will have a white stripe, while a modulator that is held in by a 'fork-type' bracket will be a green stripe.

Having said that, what are the differences between the white & green and the red & black modulators? Shifting points?

If I find that my C4 doesn't have the white/screw-in style modulator (as found on a '68), but instead has the fork-type, what year/era would that make my tranny?

Thanks again.
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Old 11-02-2011, 12:17 AM   #4 (permalink)
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Ok here's what I know:
white stripe - screw style for 67- 72 c4 & c6
Green stripe - screw style for 69 - 73 fmx
Blue stripe - Screw style for 69 - 73 fmx
Purple stripe - Push-in style for 73 c6
Green stripe - push-in style for 73 c6
Red stripe - dual diaphragm push-in style for 73- 76 c4
Green stripe - push-in style for 73 - 86 c4 & c5
No stripe - Dual diaphragm push-in style for 74 -76 c3
There's more info for late 70's transmissions but I would find the casting number on the transmission as that will tell you exactly what you have.
- Chris
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1967 Ford Mustang Coupe SS(Sports Sprint), 289 "C" Code, PA C4 Auto Trans, Fully Restored, Sauterne Gold w/ Black Vinyl Roof and Black Interior w/ Console, Edelbrock Performer 500 cfm carb, Pioneer radio,
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Old 04-24-2012, 03:26 PM   #5 (permalink)
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Quote:
Originally Posted by 67Mustang Coupe View Post
Ok here's what I know:
white stripe - screw style for 67- 72 c4 & c6
Green stripe - screw style for 69 - 73 fmx
Blue stripe - Screw style for 69 - 73 fmx
Purple stripe - Push-in style for 73 c6
Green stripe - push-in style for 73 c6
Red stripe - dual diaphragm push-in style for 73- 76 c4
Green stripe - push-in style for 73 - 86 c4 & c5
No stripe - Dual diaphragm push-in style for 74 -76 c3
There's more info for late 70's transmissions but I would find the casting number on the transmission as that will tell you exactly what you have.
- Chris

Where should I look for the casting number?
Thanks
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