Th400 vacuum modulator ported or manifold. problems won't move and notic...
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Th400 vacuum modulator ported or manifold. problems won't move and noticed the rpm's don't change replaced the vacuum modulator and i do have manifold vacuum 🤷♂️ where the do I go from here th400 in an 87 v10 old 4 barrel quadrajet Roy Bolton and 8 others 9 Apr 11, 2010 · Should be a port on the intake manifold for full vacuum to the modulator. If not, check the source of the vacuum on the intake manifold for a blockage and repair it. Dec 24, 2025 · Chevy/GMC Squarebody 73-87 James MccoyDec 24, 2025 Having trans. Modifying the modulator raises the pressures inside the transmission and makes life tougher for the rubber seals and the pump. When you drop it in gear, idle speed decreases and thus the vacuum signal decreases causing your timing to . Vacuum needs to react to the engine load as the throttle is opened. Question where do I get my vacuum from for modulator valve. Remove the modulator from the car and simply blow and try to suck air thru it. Jun 21, 2013 · PY Online Forums - Bringing the Pontiac Hobby Together > General Classic PONTIAC TECH > Pontiac - Street > TH400 Ported or Manifold Vac? Feb 8, 2013 · The modulator has to be hooked to a full time vacuum source (called manifold vacuum). Thanks. A port that comes directly out of the intake manifold will provide the signal that the modulator needs. Do I use a port on the intake manifold or at the 1966-67 Mustang & 1967 Cougar Brass Intake Manifold Vacuum Fitting C6AZ-9A474-A, 2 vacuum ports 3-16'' & 1-4'' and 1 threaded port for hard line to brake booster. Renowned for its robustness and versatility, this three-speed automatic transmission is found in a variety of vehicles, from muscle cars to trucks. I'd like to know if I should put the vacuum on the intake and try that before I replace the modulator. This is the Ford issued Brake Booster hard line. You don't want to use ported vacuum from the carb or you'll confuse the heck out of the modulator. Aug 24, 2012 · I have a victor jr manifold and of course they do not have vacuum ports so iam running my turbo 400 vacuum modulator off the vacuum port on my carb (holley 850 ) how much vacuum is needed for the modulator to work properly? May 9, 2025 · The TH400 transmission is a beloved classic among automotive enthusiasts. One of its most critical components is the vacuum modulator, a small yet vital part that plays a significant role in the performance and driving experience of your vehicle Dec 20, 2008 · Like said above, the combination of the modulator and governor determine shift points. Re: TH400 Vacuum source? And the answer is: Manifold vacuum. It's a very simple diaphram that either works or not. May 2, 2024 · Look and see if it has a vacuum modulator on the transmission if it does it is not a manual valve body . The stock configuration uses a hard steel line with a few inches of rubber tubing at each end. I am not sure which port it should connect to on the intake. Nov 5, 2022 · I have a th400 and a tunnel ram with no vacuum ports. My car is equipped with power disc brakes, cowl induction, and A/T so it Jan 4, 2006 · In the case of a TH400 tranny, is a manual VB or mechanical modulator absolutely necessary on a low (6" @ idle) vacuum application? Are there any mods that can be performed for improving the 2-3rd shift? What is the minimum Hg" required for decent modulator operation on a TH400? Is it true Dec 19, 2020 · The modulator line is usually connected to its own port on the intake manifold. the vacuum drops to raise line pressure in the trans Apr 4, 2010 · 63 Pro said: Yeah, Wade is correct, the vacuum hose from the vacuum modulator should be hooked up to direct manifold vacuum. This is assuming that your pump pressure is within spec. You can buy the 2-port vacuum brass block for $55 and the original Intake Manifold To C4 Vacuum Modulator Tube for $30 Sep 5, 2005 · Does it have to (or is it better to) go to the intake as opposed to a vacuum port on the carb? I just swapped in a TH400 and it's shifting a little hard. Feb 23, 2004 · The modulater line goes up from the modulator, passenger side, then attaches to the top vacuum port on the manifold just behind the carburetor with a very short vacuum hose ta a "Y" fitting made to attach two vacuum lines. . Also, on an Edelbrock intake is there a Step 3 Pull the vacuum hose off the modulator and install the vacuum pump. My guess on your description is that you have your vacuum advance hooked to manifold vacuum. Some are adjustable. The spade connector you have a photo of is the "kick-down" switch connection. A 3/16 vacuum line to intake manifold vacuum if Sep 18, 2019 · The modulator affects shift firmness, and the shift timing as a "side effect". Jul 8, 2013 · Turbo 400 vacuum port Pontiac - Race PY Online Forums - Bringing the Pontiac Hobby Together > General Classic PONTIAC TECH > Pontiac - Race > Turbo 400 vacuum port May 27, 2008 · I am restoring a 1970 SS L34/M40 car and I have a question about the proper routing of the steel vacuum line that goes from the intake to the vacuum modulator. Check level when back from a run in park. My engine is a 425. Under normal driving with lots of vacuum the modulator shifts the trans and can be adjusted like Wade said. Jul 13, 2020 · Where is the proper source for vacuum to my Turbo 400 switch pitch transmission. On a stock TBI, the correct port should be on the back side between the fuel lines (see below). The gauge on the pump should indicate close to 20 inches of vacuum. Transmission operation depends heavily on clean fluid flow through out.
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