Yes, the little black cap on the modulator itself. Trust me, you only want to change the modulator as a last resort. It has to be adjusted, determined by transmission pump pressures, the model of car, and at a certain speed range. You will likely need to replace the pin that needs to go with it as well. It's best to clear up all of the related vacuum leaks, including the ACC system, beforehand.

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Sam

84 300SD 350K+ miles ( Blue Belle )