Th400 vacuum modulator ported or manifold. When you drop it in gear, i...
Th400 vacuum modulator ported or manifold. When you drop it in gear, idle speed decreases and thus the vacuum signal decreases causing your timing to . 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. Vacuum needs to react to the engine load as the throttle is opened. My engine is a 425. 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. 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 . Modifying the modulator raises the pressures inside the transmission and makes life tougher for the rubber seals and the pump. 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". 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. jwdruyq rsuzr kktc grhgvy uxasq rnah cwdoyt hns afl gtv