ford C6 Modulator valve & modulator valve pin questions.

[Adam89]

So i have a 1980 c6 transmission that was leaking oil around the modulator valve (Bad O-ring) the stripe had long since worn off so i just bought one with a black stripe cause i had always been told that the stripe didn't matter cause they're all adjustable and the black stripe was most common. Is this true? And if so how to i adjust it and where? i'm guessing its the ***** where the rubber hose connects to the valve but i'm not sure. Also the its been apart for a couple on days and when i went to put it back together i went looking for the modulator valve pin and there it was, GONE, and i can't find it, i know they come in different lengths so can i just put a different pin in it and adjust the modulator valve till it shifts right? Thanks.

 

[miesk5]

Yo Adam,

Welcome!

Correct;

Vacuum Modulator, Diagnosis & Replacement"...The different color bands indicate the diameter of the rubber diaphragm inside the modulator. The two COMMON colors from auto parts suppliers are PURPLE and GREEN. These are for CARS. TRUCKS like OURS REQUIRE the BLACK banded modulator, likely from a transmission shop or dealer. This is reguarding the mid/late 80's models, maybe more... Id venture to say any C6 with a slip in modulator. Again, PURPLE and GREEN are NOT the correct units to use, BLACK is the intended modulator as was designed for TRUCKS..."

Source: by MyFullSize (Andrew)

Vacuum Modulator Adjustment; "...Most modulator diaphragms have an adjustment ***** through the vacuum tube hole. ***** clockwise for later/firmer shifts and counterclockwise for earlier/softer shifts. However if more than two or three turns don’t get what you want, you may have other problems."..

Source: by Kenneth C at Bad Shoe Productions badshoeproductions.com

Vacuum Modulator Adjustment; "...Stock factory modulators are pre-set and most are sealed. TCI® StreetFighter® modulator-type transmissions are all equipped with adjustable modulators. By turning the adjusting ***** (found in the vacuum ******) counterclockwise, you will lower the spring pre-load. This will cause earlier shifts. By turning the adjusting ***** clockwise and raising the spring pre-load, the shift points will go up. The range of adjustability is only a few mph either way..."

Source: by tciauto.com

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C6 Description & Operation, Adjustments, Diagnosis & Testing (partial), Disassembly & Assembly, Parts Break-Out Diagram, Hydraulic Control System Diagram, Removal & Installation & Specifications @

http://web.archive.org/web/20090529064029/http://www.thedieselfiles.com/Ford/C6%20Automatic%20tranny.pdf

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1980 Bronco Brochure by Ford via Josh B. @ http://www.supermotors.net/registry/6264/22004-2

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GL!

Al