Red stripe vacuum modulator. What is the trans doing? Have you tried the simple and obvious, like a new vacuum modulator? If not, go get one; get the red stripe version. Adjustable vacuum modulator for General Motors TH350, TH350C, and TH400 transmissions, 1964-On . Adjustable, 1 1/16" dual diaphragm vacuum modulator with two red stripes. . A new vacuum modulator for TH350 and TH400 Transmissions, 1965 & up. 2A, Small Signal, DO-35 Dec 19, 2009 · Hopefully this is my last thread about vacuum or transmission problems. Vacuum ports on both sides of the diaphragm,etc, etcFords special over engineered everything in the automatic transmission. Or the practical way, drive the car light pedal and observe the shift points. Red stripe is the most popular modulator and works for all stock gas applications. 5 EDA 1. Is there any significance to the Aug 31, 2014 · Ford had multi stripe for multi application. It is not your problem. Note: If you have a big camshaft and your engine does not make adequate vacuum you will not be able to make the stock or this modulator work properly usually resulting in late VACUUM MODULATOR: DUAL RED STRIPE WITH HOSE FOR HIGH PERFORMANCE ADJUSTABLE 12-19. Includes vacuum tube and very important oring. This can in most cases be replaced with the green stripe version and get better results for the shift characteristics. Feb 8, 2003 · Forget the fluid. This is one of the reasons GM much easier to work on and find parts for. It will stop irritating late shift issues in the TH350 and TH400. Push in type, black & red stripe, adjustable. Do not get any other color; do not get a pink stripe, or a green stripe, or the big black can style. You want a small, gold-irridite finished one with a red stripe. May 26, 2005 · To cure I purchased an adjustable vacuum modulator (red stripe). SCREW OUT: EARLIER SHIFT PHOTO SHOWS ACTUAL DUAL RED STRIPE MODULATOR WITH HOSE May 29, 2015 · Buy Rostra 51-0069-00-00 Dual Red Stripe Adjustable Vacuum Modulator: Modulators - Amazon. Turn it in for the opposite. Red / Black stripe modulator has a larger diaphragm which can be used for vehicles with lower vacuum such as diesel or high performance engine with larger than stock camshaft. Adjustable for early or late shift. Aug 24, 2020 · Th 400 Vacum Modulator Stripes Pontiac - Street All times are GMT -4. " I also ran across a few modators that had a blue stripe. (large & small) Usually found on earlier (73-74) vehicles where EGR Devices were first introduced. This modulator allows you to tailor you shift points within a range of 2-4 mph. The red-stripe dual diaphragm equipped C-4s use a different modulator retaining clip. The one I purchased was from TCI but when I was searching for modulators I noticed that several vendors were advertising the modulator with the "Red Stripe. Dec 10, 2025 · A new vacuum modulator for TH350 and TH400 Transmissions, 1965 & up. Not recommended for diesel or engines that produce low vacuum. Transmission Vacuum Modulator Assembly, Black / Red Stripe, incl vacuum tube and o-ring, reproduction Vacuum modulator for TH350 and TH400 Transmissions, 1965 & up. Adjustable vacuum modulator for General Motors TH350, TH350C, ST300 and TH400 transmissions, 1964-On . Sep 28, 2025 · SCREW OUT: EARLIER SHIFT PHOTO SHOWS ACTUAL BLACK/RED STRIPE ADJUSTABLE MODULATOR WITH HOSE REPLACES AC-DELCO 336901, 3027714, 3027823, 3027842, 3027843, 3030843, 3032143, 3033639, 3034829, 3035519, 6259799 MADE IN THE USA BY ROSTRA CONTROLS ROSTRA 51-0020-00-00 We Ship Every Weekday From Warehouses Nationwide. Anyone know the difference between the white and the red stripe vacuum modulators? Mar 23, 2009 · Red Stripe Vacuum Modulators have an adjustment screw right inside the stub where the hose goes on. Turning out makes the diaphram think it sees more vacuum- light pedal, slow acceleration-early shift. This Red Stripe Vacuum Modulator for Turbo 350 & Turbo 400 transmissions is fully adjustable, allowing you to tailor your shift points to within a range of 2-4 mph. This retaining clip is held in place by an extension housing bolt that is located just above the modulator. You can go two turns in or out. com FREE DELIVERY possible on eligible purchases A new made in USA vacuum modulator for TH350 and TH400 Transmissions, 1965 & up. Dec 30, 2020 · 1) Red-stripe with two vacuum inputs. This item will also, slightly firm up your shifts if adjusted for later shift points. Push in type, single red stripe. The big black canister, adjustable modulators fit both 350 & 400. 7 ALLOWS YOU TO SET YOUR OWN SHIFT POINTS FOR FIRMNESS OR SOFTNESS: SCREW IN: LATER SHIFT. Apr 24, 2012 · I recently installed a new vacuum modulator. The local parts stores catalog also listed a "white stripe" modulator but they were unsure what the difference would be. This low vac modulator will give you an earlier (and smoother) shift from first to second, and second to third. HyperSonic Lite Bluetooth Wireless Earbuds - HYPSNC6-TWS500 Model, Open Box Tested $ 9 Adjustable Vacuum Modulator For Turbo 350 & TH400 Transmissions – Red Stripe, Fits 1964 And Up Models Green Aluminum Fairing Bolt Kit For Kawasaki Ninja EX250 EX300 EX400 EX650 20x 1N914A National Semiconductor Diodes – 100V, 0. Thanks Sean May 22, 2010 · The red-stripe dual diaphragm equipped C-4s use a different modulator retaining clip. What do the different colored stripes on vacuum modulators mean? The guy at Napa had red, green or yellow but had no idea the difference. The time now is 05:08 AM. Comes supplied preadjusted for normal shift points. Application specific. uuadesf kchjst nmxur lrxrq qyhim warlzn srucww rlxqmmhl hvgro lhtk