Steve G Posted January 6, 2023 Share Posted January 6, 2023 Hello everyone, my th350 has a vacuum line that goes from the intake to the rear of the transmission. The factory line is 5/16 but is reduced to about 1/16 on each end. What will happen if I just run 5/16 or do I need to add a restrictor? thank you. Quote Link to comment Share on other sites More sharing options...
MC1of80 Posted January 6, 2023 Share Posted January 6, 2023 You can run a hose. No restriction needed or wanted for that. 2 Quote Link to comment Share on other sites More sharing options...
Scott S. Posted January 6, 2023 Share Posted January 6, 2023 As long as you have a good seal at each end, it should be O.K. Quote Link to comment Share on other sites More sharing options...
NavyCPO Posted July 20, 2023 Share Posted July 20, 2023 That line goes to the Vacuum Modulator on the rear of the transmission. Agree with the other 2 fella's above, should not be a problem. If you lose vacuum in that line it will be a problem and you'll run around in first gear because it will not UP SHIFT. The Modulator controls the shift points. There is also a tiny straight slot screw head inside the port on the modulator that you can adjust in or out to adjust when your car upshifts. If you feel it is shifting too soon and you want it to wind out a little bit longer, or shifting too late and you want it to shift sooner, that is where you can adjust that. Quote Link to comment Share on other sites More sharing options...
cny first gen 71 Posted July 20, 2023 Share Posted July 20, 2023 I'm not sure all modulators have that adjustment screw but I could be wrong. I don't remember the oe modulators having it. 2 Quote Link to comment Share on other sites More sharing options...
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