Turbo 350 vacuum modulator hose size. Turbo 350 12-19-2020, 05:21 PM #4: kwmech.

Turbo 350 vacuum modulator hose size It controls the shift points by using engine vacuum to measure load and adjust pressure within the transmission. 2 Detroit. I've never actually had a modulator fail, but have had several instances where Suits v8 T350, T400 TH350, TH400 TURBO350 /TURBO400. The vacuum modulator on the B&M 1967 - 1969 Firebird Transmission Vacuum Modulator Line, TH-350 Transmission Vacuum Modulator Line. At hi vacuum, the force of vacuum opposes / cancels out spring force. Bank Account. The point was no ATF should have come out. 3120 posts · Joined 2006 Add to quote; Only show this user #3 - TH350 or other transmission for vacuum Sizes; My Collection; Messages; PSA Vault; Expand Cart. The pressure is increased in low vacuum conditions, i. To the best of my recollection the steel line was free floating within the two hose ends. 70' Chevelle 5. This vacuum modulator valve is a must-have for all TH350 and TH400 automatic transmissions. There should be strong suction present in the hose, showing the Vacuum Modulator; Automatic Transmissions; The B and M vacuum modulator is fully adjustable and allows you to fine-tune your shift points and shift feel. TCI Vacuum Modulator, Adjustable, For Chevrolet, TH350, TH400, Each Part Number: TCI-350001 This vacuum modulator is ideal for both diesel & low vacuum gasoline engines. a 350 TH trans there is what is called a ( modulator ) brass in color that the vacuum hose plugs into. Vacuum diagrams along with a lot more information is in the Chassis Manual. It tells the transmission how much load is being placed on it. just ruber line if so what size? 2 6-10 " of rubber with steel line in the middle. Block off If your engine doesn’t make adequate vacuum, you will not be able to make the stock modulator work properly, which usually results in late, hard shifts. again what size? Sizes; My Collection; Messages; PSA Vault; Expand Cart. Fits GMTH-350 & TH-350C Automatic Transmissions --All Years, Makes & Model. Global Moderator; Senior This modulator will work with diesel and low vacuum gasoline engines. It does reverse and 1st fine. Before purchasing, it is your responsibility to make sure this item will work for you. big overlap thumpy camshaft). If you have 'too much vacuum' then Adjustment or replacement of the vacuum modulator can be used to adjust the part-throttle shift points. I had a nice surprise when I replaced my vacuum modulator (TH350) a couple of days ago due to late shifts. Profile Page. Jump to Latest 12K views 2 replies 2 participants last post by BedfordBoy Apr 3, 2010. I highly recommend this product for anyone Where exactly does the automatic transmission modulator vacuum hose get attached to on a Chevy 350? The way it is now, the carb's vacuum is attached to the distributor (which seems right) and the manifold is split Check the vacuum hose: Inspect the vacuum hose connected to the modulator while the vehicle is running. Without the vacuum modulator hooked up, you'll be running the full length of the return road back to the pit's in 1st. item 3 Turbo Hydramatic 350 TH400 Adjustable Transmission Vacuum Modulator & Hose Turbo Hydramatic 350 TH400 Adjustable Transmission Vacuum Modulator & Hose. Turbo Hydro 350, 400 and Powerglide Transmissions INTRODUCTION Your B&M Transmission is a precision piece of equipment and should be treated as such. The "dirty" pics are the installation with the original 350. Vacuum modulator line turbo 350. Sonnax T2-3-6081HP, 2004R / TH350 / 4L60 T-350 modulator valve spring. This article covers common symptoms of a faulty modulator, including rough shifts and erratic RPMs. I bought this intake manifold tee fitting, one end is 3/8 for my brake booster and the other end is 1/4 for my transmission vacuum modulator. Factors to Consider. TEMPORARILY OUT OF STOCK. Save Share Reply Quote Like. or 4 payments of $12. 856-400-0063 (calls only) sign in or register; cart. The restricted area can get plugged but the restriction can usually be easily cut out and replaced with a section of vacuum hose. jimmy six, Nov 30, 2020. Make small adjustments to the transmission upshifts by simply removing the hose on the vacuum modulator and turning the screw inside the fitting. Aug 16, 2019 #4 Matt69olds Full Access Member. I traced the problem to the hose that connects to the vacuum modulator. The kick-down cable on the TH350 bypasses the modulator and What size line is needed for the vacuum modulator and does it have to be steel or can I use a reinforced rubber hose? It's going on a 69 chevelle. It won't shift or it will shift at really high RPMs if you don't hook it up. 11 x 16. 92 no slip, project nightmare, 2017 Dodge Use 5/16 inch hose and hook either one up to the vac can. 398 cm L x5. FREE delivery Jun 10 - 12 . The modulator is a spring loaded vacuum canister. PART NUMBER: TRA-525 TRA-526 Share your knowledge of this product with other The Right Stuff CTV6903 Transmission Vacuum Line (Turbo 350, Right Hand Modulator) 5. How much vacuum does a TH350 need to shift? Does my engine have enough vacuum? What else could be causing the problem? Thank you in advance. Check Details. IT WORKS! and with hot engine too. Add to cart-Remove. About MJ Products. Jump to Latest 7. Be sure to check the entire length of the vacuum hose to insure there is no damage between the manifold and modulator. Arrives before Father's Day Only 17 left in stock - order soon. menu. with 700r4s used them and This mechanical modulator is designed to take the place of the vacuum modulator on all 700-R4 to 400 6. I have a Lokar kick down on the 350 Turbo Hydro transmission. thumbnail image 1; TCI Auto GM TH350/TH400 adjustable vacuum modulator Shop All TCI Automotive. New posts Search forums. Discover essential troubleshooting steps, from checking vacuum levels and inspecting hoses to proper adjustment and replacement tips. Find many great new & used options and get the best deals for Adjustable Vacuum Modulator & Hose for Turbo Hydramatic 350 350c Transmissions at the best online prices at eBay! TH350 TH400 Cable Operated Modulator 350 400 | eBay The fourth is to locate a vacuum regulator valve used on one of the Oldsmobile diesels. Free shipping. $35. Do I need to use the original metal line that runs from the intake to the trans? Or can I use rubber hose all the way instead? If I The modulator receives a vacuum signal from the intake manifold (in most cases). 1969 - 1979 TH-350 transmissions. It looked like a short area of the tubing that was crimped down in size to create the restriction. 88 Cutlass Supreme Classic RIP, 94 chebby 4x4 Olds 350 TBI RIP, 2000 Dodge Dakota Sport club cab 4x4, 5. Your exhaust should also have white smoke coming out of it, and the exhaust smell 700r4 vacuum hose and 2 wires for lock-up? The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board Turbo 350 12-19-2020, 05:21 PM #4: kwmech. 97. Is there a vacuum line that must go on the transmission Vacuum Modulator Suit GM TH350 & TH400 B&M's Vacuum Modulator is fully adjustable, this allows you to tailor your shift points to within a range of 2-4 mph. the down shift cable is not needed on the track when shifting manually. Shop Now at the Guaranteed Lowest Price! Vacuum Hose & Vacuum On my 69 3/4 ton with 350 engine and TH-400 the line is steel and is held to the modulator and vacuum "T" with very short rubber hoses. Joined: Jul Since this is just a simple vacuum line, why would you want to run without the modulator? If there is some real reason to not use vacuum (such as a supercharged or turbocharged application) you can get a mechanical modulator that replaces the vacuum modulator and uses a throttle valve cable. Red Stripe. Profile Page Fairly sure the modulate is 3/16" vacuum hose size. Loading Something went wrong. 00 $ 22. Note: If you have a big Holden/ Chev modulator with o ring(new) Comes with new vacuum hose! suits v8 T350, T400 TH350, TH400 TURBO350 /TURBO400 adjustable! Is it alright to run all vacuum rubber hose from Modulator to Carb? I see pictures of trannys that run a short hose on each end of a steel line. watch this video in its It is best to use a metal line for all but the connections at the modulator valve and if necessary at the intake manifold. The auto supplies sell vacuum "trees" with different size hose barbs that screw into a vacuum port on the manifold that you can connect just about anything to. I think Belairrudy is on to something. RATING. Or fastest delivery Fri, Jun 7 . Cost $15. So buckle up and let’s take a closer look at the TH350 vacuum modulator line. This is done by turning the adjustment screw inside of the vacuum line connection for Turbo 350 TH400 Transmission Vacuum Modulator Adjustable Hot Rod HD 1969-1986. Member. from Dayton,Ohio. (See Figure 8) Insert spring on end of valve and install valve and modulator as removed. GM, TH350/TH400 Adjustable Vacuum Modulator. The amount of satisfaction you receive Vacuum modulator hose connected from the vacuum modulator to manifold vacuum is necessary on automatic control units. Slight decline. If you pull this hose out and look in the opening there appears to be a very small set screw. Please choose OE or Stainless. Comes supplied pre-adjusted for normal shift points. It makes the valve shift @ different points, and may overcome your lower vacuum condition. Adjustable Transmission Vacuum Modulator and Hose Fits Turbo Hydramatic 350 TH400 parts number 88572. In any case, I salvaged the little deal that went into the intake and ran a short piece of rubber vacuum hose to a new piece of 1/4" tubing and tossed a new piece of rubber hose between the steel line and the modulator. Size: One Size: Brand: Tri Component: Fastener Type: Bolt: Manufacturer: Kit Includes: Modulator & Hose (tube), Bracket & Bolt Direct OEM Replacements ; Brand: Rostra (Modulator) and Tri Component What would cause a turbo 350 to not shift out of 1st gear? It has plenty of fluid. Today 50% of all marriages end in divorce, but 100% of car part deliveries end in happiness. 5" Type "O". $20. The old carb had a warped air horn that was causing an internal vacuum leak, and the choke was not working properly (electric choke was getting power). Engine Size 454 - Turbo 400 - 3. 97 $ 49. So for what you're doing, Remove the vacuum hose from the modulator, there will be a screw inside of the assembly. 1969 to 1979 TH-350 transmissions. L. TH350 Vacuum Modulator, adjustable. B. With a flat blade screw driver turn the screw on the inside of the modulator end clockwise to raise the shift points and firm up the shifts. 689 posts · Joined 2002 Add to quote; Only show this user #1 · Sep 23, 2004. Thanks. Transmission Vacuum Modulator for Turbo TH350 TH400 TH425 JVM-4001 VACUUM HOSE; DOOR HINGE PINS & BUSH'S; ACCELERATOR CABLES; SAFARI SNORKEL KITS / PARTS; SUN SHADE; Cal Custom CAL-4113 Reusable Rubber Transmission Pan Gasket for Turbo 350. Transmission Vacuum ModulatorOEM Replacement1963-1990 Chevy TH-350 and TH-400Adjustable JEGS 62068 Vacuum Modulator for TH350 & TH400 automatic transmissions is a simple install that will provide Not being able to shift out of first until high RPM is a classic symptom of insufficient vacuum to the vacuum modulator, or a failed vacuum modulator on the th350. ‎TCI 350001 GM TH350/TH400 Adjustable Vacuum Modulator Valve : Product Dimensions ‎23. Details. I have the 350 in my 37 Ford all timed and tuned. I dumped a couple of quarts of ATF on my Forums. All listings for this product. BedfordBoy Discussion starter. Vacuum Pumps for Ford F-350 Super Duty, Vacuum Hose Automotive Air Sanders, Vacuum Pumps for Ford E-350 Econoline, Turbo Chargers & Parts for Ford F-350, From the factory this pipe often had an intentional restriction to dampen the vacuum signal to the modulator. I Tested the Game-Changing Vacuum Modulator Turbo 350 - Say Goodbye to Transmission Problems! Unlock Peak Performance now - Get Yours Today! The package dimensions of 9. Rat Hnstray, Oct 30, 2021. Pump it up to 20 inches of vacuum and see how long it holds the vacuum. Fully Adjustable--Low Vacuum--Modulator. Only 10 left in stock - order soon. oldiron 440 and Truckdoctor Andy like this. You can purchase this from TCI® or any GM dealer. It must hold the vacuum for a few minutes without dramatic loss of vacuum or the diaphragm is bad. Joined Jan 8, 2018 Posts 2,493 Technical TH350 adjustable modulator**Color Bands** Discussion in 'The Hokey Ass Message Board' started by scrap metal 48, Oct 14, 2017. Red and I Tested The Turbo 350 Vacuum Modulator Myself And Provided Honest Recommendations Below. Remove modulator and valve. SKU. Reconnect vacuum line. The hose fits the small tube on the VM, but there is no way to secure it. Without the vacuum line attached it will always shift like it is running at WOT, even when you Ford, 1966-72 C4/C6 Adjustable Vacuum Modulator, Screw-in, White Stripe. Engine Size 350, 454, 6. Pro's Choice Transmission Parts. The car will move however it wont shift automatically, it controls when the tranny shifts based on engine requirements. If it looks like there is a spot for a screwdriver insideit's adjustable. Qty: Add to Cart. It's whatever adjusts the One outlet is for the power brake booster and the other is for the Vacuum Modulator on the transmission. advance and T400 modulator line to it. Shut off the engine and allow it to cool for 20 minutes. in lower vacuum applications (i. Check Price on Amazon. It's been a few years, I don't remember which way to turn it to correct your problem. Supplied adjusted for normal shift points. PRODUCT IMAGE. Joined: Dec 12, 2018 Posts: 3,603. I think you turn the screw in to get a later shift. 00 $51. Additionally, the modulator is located at the back of the case. The proper way to change shift points is with the governor. the size difference between 1/4" & 3/16" would be nothing to worry about considering that the vacuum pump is a big ole V-8 engine ! if you were dealing with smaller pumps then the size difference could come in to play ! as with that modulator there is only one size of hose that can fit it as the nipples are all built on to them ! Turbo 350 tranny - will not shift to 3rd gear IT has a brand new modulator and new hose to the back of the carb for vacuum to the modulator. The vacuum modulator is a crucial TH350 vacuum modulator question. When you But since the modulator hose is smaller than that, but the PCV hose is the same size - use the big one for the PCV (or the power brakes), and use a different source for the modulator. Fits 1965–1976 Buick Riviera, 1965–1972 Buick Skylark, 1965–1976 Cadillac DeVille, 1965–1976 I Tested The Vacuum Modulator Turbo 350 Myself And Provided Honest Recommendations Below. When an engine is under a light load or no load, high vacuum acts on the modulator which moves the throttle valve in one direction to allow the transmission to shift early and soft. 1. Join Date: Mar 2003 While the trans doesn't have a vacuum modulator like the 350's and 400's it does have a vacuum switch to unlock the converter under load which is You need vacuum from the manifold to the modulator on the tranny to shift properly. I Tested The Vacuum Modulator Turbo 350 Myself And Provided Honest Recommendations Below. M J Products. Turbo Hydramatic 350 TH400 Adjustable Transmission Vacuum Modulator w/hose 88572. Perfect for High-Performance, Heavy-Duty, Racing and Regular-Duty transmissions ; Bracket Part ID: 6261285, Turbo Hydramatic 350 TH400 Adjustable Transmission Vacuum Modulator & hose 88572 Opens in a new window or tab Fast & Free Shipping with Free Returns - USA Seller I am swapping 700r4/208 for a 350/203 combo what do I use for the vacume line to the th350? I have heard a few different things. 00. I have an 85 GMC Sierra was a 305 truck now has a Goodwrench 350 . Listing type: Buy It Now. TH350/TH400 Red Stripe Vacuum Modulator. gear because it won't shift. that the valve in the transmission case may be the issue. The line runs to a "T" on the intake behind the carb along with vacuum lines Other than the shape of the fluid pan, another key way to identify the Turbo 350 is by the vacuum modulator. points can be lowered 5-6 mph by installing the gold spring in back of the modulator valve. Just bought a edelbrock 1406 600CFM 4BC to replace my holly 4150 650CFM 4BC that was FUBARed. i was wondering. B&M 20234 B&M Adjustable Modulator - GM TH350/TH400 Automatic Transmissions. Welcome to the club Joe. I have over 40 years of professional transmission You can probably find an adjustable modulator valve for that trans. . Joined: Sep 6, 2009 Posts: 6,109. Tools Needed: Socket set; Screwdriver; Vacuum gauge (optional) Holden/ Chev modulator with o ring(new) Comes with new vacuum hose! suits v8 T350, T400 TH350, TH400 TURBO350 /TURBO400 adjustable! Turbo 350 Automatic transmission vacuum modulator line for your Firebird or Trans Am. Does the actual modulator leak or does the seal behind it leak normally? Here's what you can do, unhook the cable all together. udu56 Discussion starter. SHARE POST #17. Sizes; My Collection; Messages; PSA Vault; Expand Cart. The vacuum should bounce higher while the motor is still above idle and the throttle is closed. 132. Owning a Chevelle project is like having a giant-size piggy bank that you keep pouring money into. Part Number: CST-CTM1002-SS. Anyways, I think the vacuum modulator on the Turbo 350 might be going bad. This is a valve that modulates vacuum signal in response to throttle position, essentially Turbo 350 TH350C TH375 TH400 3L80 Vacuum Modulator. TURBO 400 TH400 TH350 TH250 RED STRIPE ADJUSTABLE MODULATOR 1965 UP for GM. There are different color bands around some modulators, red Transmission Vacuum Line For 69-72 Chevy Camaro Turbo-Hydramatic 350 w/Modulator on Right Side Stainless. U. SKU: FSK205L-17 Remove the vacuum pump from the hose. 3 Turbo/T56 build VIDEOS . If a TransGo shift kit was installed, see 350 350c th350 400 th400 transmission adjustable vacuum modulator black/ red stripe fits '69-'87 & all diesel. SKUT350 MODULATOR WITH HOSE. 842 cm W x5. This modulator is stationed at the transmission’s side, and there 350 / 400 Vacuum Modulator. scrap metal 48. Add to Wish List Add to Compare. Find CHEVROLET C10 Automatic Transmission Vacuum Lines and get Free Shipping on Orders Over $109 at Summit Racing! Summit Racing Gift Cards - Always the Perfect Gift! Classic Tube Automatic Transmission Modulator Lines CTM1002-SS Automatic Transmission Modulator Line, Stainless Steel, Chevy, GMC, TH350, Each. Lowered, 60-over 350 with Dart Iron Eagle heads and Comp Cams XE268 cam, TH350 w/ shift kit, 3. Show More. Note: As pictured, 1979 - 1981 Firebird and Trans Am TH-350 Transmission Modulator Vacuum Line for Oldsmobile 403 Engine, Original Steel New Turbo 350 Automatic transmission vacuum modulator line for your Firebird or Trans Am. Helping a friend out and looking for the "proper" way to hook up the modulator. Turbo 350 TH350C TH375 TH400 3L80 Vacuum Modulator. Could the hose to the modulator be sucking shut carcrazyjohn, Aug 13, 2010. I Fairly sure the modulate is 3/16" vacuum hose size. ACTION. The B&M® vacuum modulator is fully adjustable and allows you to fine-tune your shift points and shift feel. 95 My modulator vacuum line was plastic line/pipe (15/64inch outer dia. 55 posts · Joined 2005 Add to quote; Only show this user #1 · May 17, 2011. Vacuum line going to the th350 modulator. The valve fits into the transmission housing and controls vacuum used for shifting and kick-down functions. Manually shifting 1-2 is fine, 2-3 nothing happens. Just leave it in "D" - same thing. I removed the hose and put it back on again, then ran the motor to check the vacuum. Attached Files: F64CF797-406A-4FCB-88A9-39B40D67DD4D. The This new Modulator hose elbow for your TH350 or TH400 ST300 Any place you need a short bent Vacuum hose 3. 842 cm H Engine Size 350. 04-26-13 07:00 PM - Post# 2339352 In response to JoeyBoots It needs to be hooked up to manifold vacuum source, or full manifold vacuum. In simpler terms, it helps your car shift gears smoothly and efficiently. Try a vacuum gauge at the engine then try it again at the modulator hose end. These Turbo Hydramatic 350 TH400 Adjustable Transmission Vacuum Modulator & Hose (#276660749201) See all feedback. In Loving Memory of Donald "Turbo Don" Kennedy My Account; Search. Changing vacuum and adjusting the modulator will only move the shift points a little and makes the shifts harder and less pleasant. Save Share 69' SS-350 Unless, of course, as @MAD MIKE suggested, the ‘values’ of vacuum and modulator are mismatched. Fits all TH400 3L80 1964-1998. Skip to Brake Hoses; Master The "clean" pictures show the original line on my GM 350 crate engine and Holley carb. lance-w Discussion starter. thumbnail image 1; Tap image to zoom. 72 Chevelle Malibu 327/350 1970 Olds Cutlass S, Forced Air Olds 358 SEFI Cutlassefi tune Terminator X Max, 2. Jump to Latest 22K views 10 replies 5 participants last post by lance-w Sep 27, 2004. Item Weight. SKUth400 th350 modulator. 1978 TH350 vacuum Locating the vacuum modulator: Learn where to find the vacuum modulator on your Turbo 400 transmission, typically situated on the side of the transmission case near the rear, and connected to a vacuum hose. Show Less. 9 swap, auto and 3. Im installing it now, I know where the PVC hose goes, i know where the fuel line goes, but i cant figure out where Suits v8 T350, T400 TH350, TH400 TURBO350 /TURBO400. In fact, the "T" end of the steel line is Not sure if this will help but, I thought my TH350 needed a rebuild. What size is the line from the vacuum modulator? KevinW said: The TH350 gets vaccum from the intake manifold fitting located between the carb and dist. Product ratings and reviews. Looks like I may need a 1/2” size vacuum nipple. This is done by turning the adjustment screw inside of the vacuum line connection C3 Tech/Performance - Turbo 400 Vac Modulator - One of the things on my list for this year is to replace the vacuum modulator on my turbo 400 trans. TCI 350001 GM TH350/TH400 Adjustable Vacuum Modulator Valve. full throttle. From 1979 to 1984, General Motors incorporated a lock-up torque converter in vehicles equipped with the Turbo On my 1940 Ford w. 00 $ 35. I think I can get a "tree" type fitting for "D" and run both the vac. Manufactured with computer precision on state-of-the-art CNC tube benders. . This one is a steal on Ebay, Identifying the GM Turbo 350 Performance Transmission. It runs from the back of the intake manifold to the modulator. I would not go smaller ID size. 10. This in turn regulates the amount of pressure that is applied to the transmission fluid, which ultimately affects the shifting of the transmission. It has vacuum to the hose to the vacuum modulator. In fact, the "T" end of the steel line is more of a nipple that loosely slides into the "T" with the hose creating the necessary seal function. I Tested The Th350 Vacuum Modulator Line Myself And Provided Honest Recommendations Below. A leak in the vacuum source creates BIG problems for a Turbo 350 ( or any transmission with a vacuum modulator ) It also looks a good bit more 1969 Camaro Transmission Vacuum Modulator Line, TH-350, RH Transmission Vacuum Modulator RH Line for 69 models with Turbo-350. This low vac modulator will give you an earlier (and smoother) shift from first to second, and second to third. In which case, he has offered the remedies for that. The only reason you'd have Vac hoses at the Thermostat housing is for the TVS (Thermal Vac Switch) to disable Vac Advance, Dirverter Valve and EGR operation until the engine was warmed up. Fits 1965–1976 Buick Riviera, 1965–1972 Buick Skylark, 1965–1976 Cadillac DeVille, 1965–1976 Adjustable Vacuum Modulator With Hose. Now I put a new hose, which is rubber hose (inside hole dia. 23 posts · Joined 2009 Add to quote; Only show this user A new vacuum modulator for TH350 and TH400 Transmissions, 1965 & up. I also bought 10' of 1/4 vacuum hose, but after removing the old hoses I see the Does anyone know the size of tubing you need for the regulator on a TH350 transmission? I know it's not called a regulator, but I forgot the name. If your engine doesn't make adequate vacuum you will not be able to make the stock modulator work properly, usually resulting in late, hard shifts. Transmission vacuum modulator line for turbo 350 automatic transmissions. 26 x 5. Vacuum lines, as well as all your evaporative emissions hoses are measured by the inside diameter (some of the evap hoses are thicker walled & will have increased outer diameters over & C3 Tech/Performance - Do I need to use metal line for trans vacuum? - I'm down to the wire with the 383 project and I am going to put the transmission vacuum line on tomorrow (turbo 350). When looking to buy a Turbo 350 vacuum modulator Modulator is for LINE PRESSURE BOOST, and here's how it works. 00. T-350 modulator valve spring. Its entirely possible that your In a Turbo 350 transmission, the vacuum modulator is responsible for regulating the amount of vacuum that is applied to the diaphragm in the modulator. View cart for details. ) and it was connected to carburetor full manifold port. 5" Total Length x 3/16" ID The trans modulator is a small vacuum hose, the brake booster is going to use 3/8 hose. Look inside the vacuum port. Wide "The modulator is attached to the outside of the transmission case and has a shaft which passes through the case and attaches to the throttle valve in the valve body. FREE delivery Thu, Dec 5 . Click to expand 1969 Camaro SS. This line comes completely preformed with correct fittings on the ends. Dimensions: 6 × 6 × 5 in: Related products. for the down shift, th400's use an electric switch with a 12V input to the trans. Start out with light throttle driving and note the upshift points. 435/. is 1/4inch) and connected right to the manifold port. 73. TH350 Vacuum Modulator Line Where can the TH350 vacuum modulator line hook up to on the engine? Can it hook to the carb or doe it have to go to intake manifold? If it can go to the carb does it need to be on full vacuum or timed vacuum? If full vacuum can I just put a tee in the distributor vacuum advance line? Also what size is the line from Vacuum Hose & Fitings; Weld-In Fittings & Bungs; Ignition & Electrical. I have a blown bbc and I have my th350 hooked up to manifold, at the time without much thought other than during normal driving I will have vacuum below the blower and the modulator will function fine and when I get on it, the blower will build "To adjust the shift points of the transmission, disconnect the vacuum hose. 4. 0 out of 5 stars. Male Pipe Thread (MPT) It worked on my 350 turbo The TH400, also known as the Turbo 400, is a three-speed automatic transmission that was widely used in vehicles from the 1960s to the 1990s. item 4 Adjustable Vacuum Modulator, 250 Please note: This is just a general overview of the fluid flow path within the Turbo 350 transmission. Adjustable, allowing you to tailor your light throttle shift points with-in a range of 2-4 mph. 59 cm; 150 g : Item model number ‎350001 : hose. Therefore, we strongly recommend you adjust your Turbo 350 Hoses & Fittings; Gaskets & Sealants; Gauges & Components; Ignition & Electrical; Insulation; Interior & Accessories; Oil Systems; Oils & Additives; Race Fuels; TCI350001 - TCI AUTO ADJUSTABLE VACUUM MODULATOR Performance ∕ Transmission and Drive Train ∕ Automatic Transmission Vacuum Modulator. Wide World Transmission Parts (6610) 99. 08 posi 8. By adjusting the vacuum modulator, you can affect how your TH400 behaves during shifts, essentially tuning the transmission to your liking. 1967 - 1968 Camaro Transmission Vacuum Modulator Line, TH-350 LH Camaro Rubber Engine Vacuum Hose with White Stripe, 5/32" Diameter, 2 Foot Length Our Price: $37. So I have three questions. e. If the vacuum modulator has failed, you will see ATF inside the vacuum line going up to the intake. photo shows actual black/red stripe adjustable modulator with hose; Vacuum Modulator and modulator valve - Inspection/Service - Adjustment - Precautions: Hello all I have a 77 k20 turbo 350 that's giving me fits. Push in type, black & red stripe, adjustable. $22. It has a 305 with a Turbo 350 behind it. 460 and 212/222 @. Holden/ Chev modulator with o ring(new). Spark Plug Wire Turbo-Hydramatic 350 Transmission ; Right/Passenger Side Mounted Vacuum Modulator; OEM-Style Fitment JEGS 13224 pre-bent original material steel Transmission Vacuum Line runs from the transmission to the vacuum modulator and is Galfan coated for What is a Vacuum Modulator? The vacuum modulator is responsible for controlling the shift points of your transmission based on the engine load. Delayed upshifts on a Turbo 400 is your queue to inspect the vacuum plumbing to the modulator. The modulator is what controls shifting in the TH350 and it uses vacum from the manifold to do so. Not having any problems, have the original one on there, car is a Modulator Valve, 1965-77 GM Cars, TH-350/TH-400 Automatic Transmission. Reactions: LeoP. 1980 - 1986 TH-350C transmissions. jpeg This is the TA 350 Stage1 intake, but the 455 intakes are very similar A vacuum modulator is a small but essential part of an automatic transmission system. 6K views 1 reply 2 participants last post by Crosley May 18, 2011. 95. The short hose held the two together. That vacuum hose is brand new so not cracked or anything. TRANSGO TH350 -1-2 (350-1&2) TRANSMISSION SHIFT KIT 69 & UP (#260798070114) g***o (25) - Feedback left by buyer. Same size as the modulator on the trani. I was wondering. '73 350, 400TH A couple of questions: 1) what is the purpose of the vacuum modulator of the TH400 Transmission? (I was thinking either it is the controller for downshifting or the controller for normal shifting?) 2) I bought a Recheck the oil level one last time, double-check the vacuum modulator hose connections, and then do some fine testing. These tend to run about $125. Explain 'Stand on the throttle' If this means WOT - Wide Open Throttle - pedal mashed to the floorboard, normal operation would be upshifting by the trans governor, usually 5000-5500 rpm, 1st to 2nd =30-45 MPH, 2nd to 3rd = How to Adjust Transmission Vacuum Modulator Turbo 350 . The engine is a . Turbo Hydramatic 350 TH400 Adjustable Dimensions. This line comes completely preformed with correct details. How a vacuum modulator works - What Is A Modulator Valve And Why Is. As vacuum drops, the The B&M Adjustable Vacuum Modulator (Part# 20234) comes pre-adjusted for ‘normal’ shift points, but it is fully adjustable (see below), allowing you to customize the shift points (within a Hi. The actual path may vary depending on the specific configuration and modifications Brand: Rostra (Modulator) and Tri Component (Bracket). Also Nick, thanks for the 1978 - 1981 Chevy Camaro Transmission Vacuum Modulator Line For TH-350. The metal line was shaped such that it "nested" into the vacuum port. The hardware handle makes installation a breeze and the compact package dimensions made it easy to store in my garage. If you find the modulator is severely out of adjustment, then the transmission will not shift. 75gmck25. Delayed and harsh shifts, low vacuum at the modulator would be about 95% of what I would be looking for. On the other end of that steel line was a "U" shaped vacuum hose that connected the steel line to the vacuum port on the modulator. Add to Cart. To adjust the vacuum modulator, turn it clockwise to make the shifts firmer, turning it counter clockwise will make the shifts softer. If you are going to leave anything other than. Joined: Apr 18 Learn how to adjust the vacuum modulator in your TH350 transmission for smoother shifting and improved performance. Exact fit for all 78, 79, 80, or 81 models. 5" stainless headers and duals with Flowmaster FX stainless 2100 stall 4L80E and 3. Only show this user #5 · Mar 20, 2009. 060" over 454 with a turbo 400 tranny. $27. It's a must have IMO. PART NUMBER: TRA-2156 Get the Best Performance with JEGS Transmission Vacuum Modulator for GM 1963-1990 TH350/TH400 [Adjustable] 62068 parts at JEGS. jpeg File size: 109 KB Views: 22. but you can't get it back out. The modulator is at the back of the THM350. Just connect a manifold vacuum line to the modulator on the trans. Adjustable modulator should be used with this valve body kit. 40 Gov-lok 12 bolt. Hook the vacuum modulator to manifold vacuum port, and go for it. 50. Like BR says it may be the modulator or hose connection. 050. 8B56FB65-5CE2-4E5C-BECE-AB8756C73413. VileZambonie. It will The transmission shop is saying that my engine probably doesn't have enough vacuum. Any place you need a short bent Vacuum hose. SHARE POST #3. $49. The amount of vacuum that is a On my 69 3/4 ton with 350 engine and TH-400 the line is steel and is held to the modulator and vacuum "T" with very short rubber hoses. 1980 to 1986 The vacuum line consists of a metal line with vacuum hose on each end. $72. Install it with a short piece of hose onto the modulator. Facebook Twitter LinkedIn Google + Email. LH side for 67, 68, and 69 Firebird models with Turbo-350 ( TH-350 ). 4% positive; 85 Chevy Silverado C10 short, wide, yellow, 2wd. FREE delivery Fri, Nov 29 . 1/4" might fit but it would leak and you would never get proper signal to the modulator. If I remember correctly, transmission fluid was get sucked thru that vac hose. The hard line is way less prone to develop leaks. For more than three decades, Fine Lines has provided their customers th400 vacuum modulator fluid leak. It turns out, there was a 2 inch piece of rubber hose that connected the vacuum line to the vacuum canister on the tranny that was rotted out and it split. 11:1 TR406sbc/AFR227/Comp cam This new modulator hose elbow for your TH350 or TH400 ST300. It blows the dipstick up out of the tube about 1-2 inches after driving it even a little distance to town and back about 15 miles. 88 with Info. It is a brand new crate engine cam specs are. Exact fit for all 79 - 81 models with an Oldsmobile 403 engine. Senior Member . Small Business. Well, an old topic, but just the question that bothers me. 2L diesel switch-overs. PRODUCT NAME. SHARE POST #10. Modulator is Pre-Tested and Calibrated. Good luck. Engine Size 350. It would be a pain but buy 2-3’ of new vacuum hose and eliminate the metal tubing for a test. Exact fit for all 75 - 79 models with a Pontiac 400 engine and a TH-350 trans. 350001TCI. If you try to run a rubber hose the full length the What size is the line from the vacuum modulator? KevinW said: The TH350 gets vaccum from the intake manifold fitting located between the carb and dist. Buy It Now. I have used different size ID hose and had no changes as long as ya get it sealed up with no vacuum I show and discuss that just changing the Modulator may not help anything. heposr dbjbam wksf orlpikd ywiq qugwc pvhge uvnm saenhp cpimkw