As previously noted, there definately is a modulator on this tranmission. Its a colored plastic vacuum cell about the size of a silver dollar, The vacuum line goes directly to the intake manifold. If you pull off the hose connector at the valve and fluid is apparent then you've got your culprit. The new modulator is probably different than the original and requires some multiple part replacement, The new "pin" should come with the part. Don't completely snap the new lid back on the modulator until you are happy with its adjustment. Its designed to be left on and has an externally adjustable cover that allows a 0.4 bar pressure adjustment without removing the cover. Good Luck!