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  1. #1

    Default C3 auto trans modulator. Which one?

    I want to replace the vacuum modulator on my transmission (1986 Capri 2.3L, C3 auto), but it appears that there are several different calibrations- denoted by colored stripes on the modulators. The problem- my modulator is completely rusty, so if there was a stripe on it, it's gone! So what do I do? Looking in my Ford dealership manuals and spec books, they still list a few different types. Is there an adjustable modulator available for the C3 so I can tune it?
    86 Mercury Capri GS 2.3L
    11 Ford Ranger XL 2.3L
    10 Ford Focus SE 2.0L




    19 Years of Foureyedpride.com

  2. #2
    FEP Super Member webestang's Avatar
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    I am curious as I have a C3 in my 85 2.3. Found this list, looks like it should have a black stripe.

    http://www.rostratransmission.com/tr...on-listing.php

    Scotty
    1985 Fox Notch 4-banger Ranger tube header Eastwood Royal Blue
    1988 Fox LX 5.0 AOD Vert BBK 170mph speedo Candy Apple Red
    1999 Mustang Coupe V6 Auto Chrome Yellow -Daily Driver.
    Past Pony's.....
    68 Coupe Inline-6 3-Speed-Man. Primer
    78 II Hatch 302 3-Speed-Auto Sunroof Black
    81 4-Eye Coupe 4-Banger 4-Speed-Man. White

  3. #3

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    That's a good question. My Ford shop manual lists "Yellow/Olive", "Yellow/Yellow", and "Olive/Silver" for the Single Area Diaphragm modulators and "Black/Olive", "Black/Yellow", and "Black/Silver" as the High Altitude Diaphragm modulators.
    86 Mercury Capri GS 2.3L
    11 Ford Ranger XL 2.3L
    10 Ford Focus SE 2.0L




    19 Years of Foureyedpride.com

  4. #4
    FEP Super Member webestang's Avatar
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    Hmmmmm, Rockauto lists about 10 of them and Autozone list only 1.......?

    Scotty
    1985 Fox Notch 4-banger Ranger tube header Eastwood Royal Blue
    1988 Fox LX 5.0 AOD Vert BBK 170mph speedo Candy Apple Red
    1999 Mustang Coupe V6 Auto Chrome Yellow -Daily Driver.
    Past Pony's.....
    68 Coupe Inline-6 3-Speed-Man. Primer
    78 II Hatch 302 3-Speed-Auto Sunroof Black
    81 4-Eye Coupe 4-Banger 4-Speed-Man. White

  5. #5

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    Yea. Napa also lists one too. But I don't trust that at all. Rockauto seems to use the shotgun approach- "It could be any of these!"

    I'd like to find an adjustable one and play with it to see if I could get nice firm shifts out of it consistently.
    86 Mercury Capri GS 2.3L
    11 Ford Ranger XL 2.3L
    10 Ford Focus SE 2.0L




    19 Years of Foureyedpride.com

  6. #6
    FEP Super Member webestang's Avatar
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    Curious to see what you can find and I hope mine last long enough for an engine swap.

    Scotty
    1985 Fox Notch 4-banger Ranger tube header Eastwood Royal Blue
    1988 Fox LX 5.0 AOD Vert BBK 170mph speedo Candy Apple Red
    1999 Mustang Coupe V6 Auto Chrome Yellow -Daily Driver.
    Past Pony's.....
    68 Coupe Inline-6 3-Speed-Man. Primer
    78 II Hatch 302 3-Speed-Auto Sunroof Black
    81 4-Eye Coupe 4-Banger 4-Speed-Man. White

  7. #7

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    Went out to the garage today to take a second look at the modulator. After doing some cleaning with some Brakleen, I can see some faint numbers on it. When it gets warmer, I'll put it up on stands and crawl under to see if I can read the numbers.
    86 Mercury Capri GS 2.3L
    11 Ford Ranger XL 2.3L
    10 Ford Focus SE 2.0L




    19 Years of Foureyedpride.com

  8. #8

    Default

    Well, I got ambitious and put the car up on jackstands.With the assistance of my wife, we were able to make out the numbers on it. 83DT-7A377-C1B. In my repair manuals, there is an 83DT-7A377-C2B, so I would assume that's it. The only other one that would be close would be a ...-D2B, but it's definitely a C and not a D on my modulator. That makes it either an olive or yellow/olive type modulator.
    86 Mercury Capri GS 2.3L
    11 Ford Ranger XL 2.3L
    10 Ford Focus SE 2.0L




    19 Years of Foureyedpride.com

  9. #9
    FEP Super Member webestang's Avatar
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    You have me curious about mine now if it's the same as yours.....I might have to go under the 85 and check it out.

    Scotty
    1985 Fox Notch 4-banger Ranger tube header Eastwood Royal Blue
    1988 Fox LX 5.0 AOD Vert BBK 170mph speedo Candy Apple Red
    1999 Mustang Coupe V6 Auto Chrome Yellow -Daily Driver.
    Past Pony's.....
    68 Coupe Inline-6 3-Speed-Man. Primer
    78 II Hatch 302 3-Speed-Auto Sunroof Black
    81 4-Eye Coupe 4-Banger 4-Speed-Man. White

  10. #10

    Default

    I would be curious to know as well.
    86 Mercury Capri GS 2.3L
    11 Ford Ranger XL 2.3L
    10 Ford Focus SE 2.0L




    19 Years of Foureyedpride.com

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