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Author Topic: Transmission modulator valve/ vacuum question  (Read 897 times)

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Offline pinto bismol

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Transmission modulator valve/ vacuum question
« on: September 26, 2015, 11:26:32 PM »
I'm wanting to put a new one on my 76 2.3 automatic, but napa has one with a red stripe a yellow stripe and a green stripe. The one on my car now has NO stripe.....wha t gives??
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Offline pinto_one

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Re: Transmission modulator valve/ vacuum question
« Reply #1 on: September 27, 2015, 06:31:04 AM »
The one you have may be adjustable, look on the very end and see if you have a small screw half sticking out , the stripes are for different shift points due to different reared ratios,those are non adjustable  , (engine loading =high or low manifold vacuum)  if you use the wrong one you may end up with a early or late up shift , they have a calibrated spring inside , stiff spring late shift , soft spring early shift



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Offline 74 PintoWagon

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Re: Transmission modulator valve/ vacuum question
« Reply #2 on: September 27, 2015, 08:24:03 AM »
Also check the pin they come different lengths, 1 1/2 to 1 5/8", short pin early shifts, long pin later shifts, you can make them out of 8D nails and experiment with them. If you have a screw in Mod I believe the min length is 1 5/8 and max is 1 3/4", if my feeble mind remember right..
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