I have a C4 transmission in a custom show truck. Doesnt shift right


Asked by Jun 20, 2016 at 12:37 PM about the 1965 Ford Mustang

Question type: Maintenance & Repair

The Modulator started leaking so I changed it,  Now it shifts into 2nd gear very sluggishly at low rpm.  higher rpm delays shift point very little.  it will not shift into 3rd gear at all.  I changed vacuum hose also.  What way should I try to adjust the modulator or is there another problem

1 Answer


Did you loose the pin that goes in the end of the modulator? Are you sure you are getting vacuum to the modulator. Some modulators can be adjusted by the set screw that is located where the vacuum line attaches, there should have been instructions on a base setting. I don't know if you have one of those or not. You can also purchase different length rods for the modulator from most tranny shops, the longer the rod the higher the shift point and the firmer the shift. So it's a trial and error when changing the little rods.

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