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Old 01-25-2012, 11:15 PM
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Modulator valve

Hello. I have a Turbo 400 transmission and 350 SBC. Transmission has not been used for months. I took it out today and found that it was not shifting. Properly. It seems to be stuck in 1st of second. If I put it in 2nd and then slip it into 1st I can feel a downshift but then if I shift from 1st to 2nd or drive I feel in shift. Can anyone tell me where the Modulator valve vacuum line should hook to in the engine compartment? At present I have it running into the vacuum port on the intake manifold. Also, I read an old post here that said that inside the vacuum tubing on the modulator valve there is a small flat head screw that is to adjust when the transmission shift. Have you heard of this? Thank you for your help.

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Old 01-26-2012, 03:50 PM
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As long as it's hooked to a full vacuum source.

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Originally Posted by rustman
Hello. I have a Turbo 400 transmission and 350 SBC. Transmission has not been used for months. I took it out today and found that it was not shifting. Properly. It seems to be stuck in 1st of second. If I put it in 2nd and then slip it into 1st I can feel a downshift but then if I shift from 1st to 2nd or drive I feel in shift. Can anyone tell me where the Modulator valve vacuum line should hook to in the engine compartment? At present I have it running into the vacuum port on the intake manifold. Also, I read an old post here that said that inside the vacuum tubing on the modulator valve there is a small flat head screw that is to adjust when the transmission shift. Have you heard of this? Thank you for your help.
You should be fine hooked to the intake that is /should be full manifold vacuum, and yes it's true there is a adjustment in most of the modulator valves, and a flat head screwdriver is the tool most use to adjust it. JMO



Cole
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Old 01-26-2012, 08:06 PM
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Shifting is controlled by the govenor under the round cover. You can change weights and springs to adjust shifts , much better. Takes 10 minutes, if done before.

Themodulator has a stright slot adjuster down the nipple barrel.
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