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Powerglide shifts too soon: '66 SS

3517 Views 10 Replies 6 Participants Last post by  Cam
I have a '66 SS. 396, 360HP, 2 speed powerglide. I am not certain of the rear end ratio (probably whatever was stock).
It shifts at approx 23 mph. This seems very soon. When should it shift? A friend said to adjust the modulator. I have attempted to do so, but have been unable to. Maybe I am trying wrong. Is this correct advice? Could the problem be that the modulator is malfunctioning all together and needs replacement? Where should I go from here?


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I'm not too sure about powerglides, but TH350/400's usually don't have stock adjustable modulators. Aftermarket ones are though. Not too expensive.


Member #232
66 Malibu, 454, Th400
Gatineau, Quebec
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