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It's been over 40 years since I worked in a transmission shop, so I don't remember what the color codes are. For some reason I'm thinking black is the lowest spring rating, but don't hold me to that. What I can tell you is what the color code refers to. It's the spring tension in the modulator. The stiffer the spring the more vacuum required for the shift and the lighter the spring the less vacuum required. But regardless the spring rate the adjustment works the same way on all. There is another spring behind the adjustment screw, so backing the screw out lowers the required vacuum and turning it in raises the required vacuum for the shift.
 
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