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Every transmission rebuild should include a new vacuum modulator. Our Summit Racing™ Adjustable Vacuum Modulators allow you to tailor the shift points up or down a few hundred RPM and dial in your GM turbo Hydramatic transmission to shift right where you want it.
( 33 )
$21.99
On Sale
B&M adjustable vacuum modulators let you adjust your shift points within a range of 2 to 4 mph. With a gold cadmium finish and an O-ring seal to stop leaks, they will look as good as they work.
( 28 )
$48.35
$43.52
When your classic isn't shifting properly, Scott Drake vacuum modulators could help. These automatic transmission pieces are a vital component that tells the transmission what kind of load is being put on it, allowing it to react with the proper line pressures and shift points. They are offered to fit directly in the factory location of the current throttle valve in many Ford classics. Improve the performance of your transmission with new Scott Drake vacuum modulators.
( 4 )
$35.65
Too much line pressure can cause damage to various parts under the hood of your vehicle. TransGo vacuum bypass kits will run vacuum to the transmission, even set to full manual. Not doing so will put excessive strain on your pump, seals, and engine thrust bearing. Bypass units are for use on engines with a vacuum modulator that are supercharged or turbocharged—to prevent increased boost from causing runaway line pressure.
( 7 )
$23.14
If your transmission is sending up smoke signals, then there could be a problem with your modulator. Replace old factory preset models with TCI adjustable vacuum modulators. These transmission modulators are available for several applications and allow you to fine-tune your shift points and shift feel. Simply adjust the screw inside of the vacuum nipple for more or less diaphragm preload. Your transmission relies on the vacuum modulator to function properly, and you can rely on TCI and their adjustable vacuum modulators for renewed performance and the ability to slightly raise or lower part throttle shift points and line pressures.
( 13 )
$33.95
Vacuum modulators are designed to tell your transmission what kind of load is being put on it and react with the proper line pressures and shift points. Over time, these modulators can develop leaks or get damaged, causing driving issues and even premature transmission failure. TCI solves this dilemma with these adjustable modulators. Not only do these modulators renew performance, but you will also have the ability to slightly raise/lower part throttle shift points and line pressures. Simply adjust the screw inside of the vacuum nipple for more or less diaphragm preload.
( 9 )
$23.95
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$35.95
Summit Bucks
When building a racing Powerglide, it's necessary to plug the hole left by the vacuum modulator. Sonnax vacuum modulator plugs for the GM Powerglide transmission are made from anodized aluminum, and the gasket is included.
( 1 )
$20.10
Improve slow, sloppy shifts with the addition of ATP automatic transmission modulator valves. These valves will keep your transmission shifting on cue, according to load. ATP adjustable replacements allow you to optimize shift points to meet vacuum load and improve gas mileage and performance. A bad modulator valve can be bad news for your transmission. Get control of your transmission for proper shifting of increased or decreased engine vacuum loads. Replace improper working valves with ATP automatic transmission modulator valves.
( 47 )
$21.99
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$44.99
Summit Bucks
The feed limit low valve in listed GM transmissions limits line pressure feed to the default disable solenoid and control valves. Feed limit low pressure is also connected to the boost ball system for "A" and "B" clutch control. This feed limit low valve is subject to significant side-load force, resulting in severe wear and pressure loss to the default disable solenoid and connected control valves. Such pressure loss can put the vehicle into default mode at high speeds, resulting in momentary wheel lockup, sudden downshift to 2nd gear, harsh shifts or a P0747 code. The feed limit low valve can wear out in as little as 30,000 miles, with many vehicles requiring service by 35,000 miles. A national recall from GM includes installing updated software that monitors valve performance and wear, then triggers a check engine light and reduced propulsion message 10,000 miles before failure. Vehicles are then limited to 5th gear, commonly referred to as limp mode, until the valve body is serviced to address the failed valve. Sonnax patented this drop-in feed limit low valve kit to overcome bore wear, restoring proper valve function immediately without the need or expense of replacing the entire valve body. The valve reroutes the balance circuit through an internal passage, significantly reducing the side-load force, while upgraded materials prevent future wear. * The kit overcomes drivability issues related to the GM 10-speed wheel lockup recall * Patented valve and sleeve combination overcomes bore wear and significantly reduces future side loading of the valve * Hardcoat anodized aluminum valve and wear-resistant sleeve combat premature wear * Drop-in Zip Valve parts install quickly and easily * Kit contents: -- Valve -- Sleeve -- Spring -- Retainer -- Drill -- Rivet (Note: The OE feed limit low valve is susceptible to premature wear and therefore a critical failure point. Replacing the valve is recommended even if the transmission isn't exhibiting problems and the valve passes a vacuum test.)
Not Yet Reviewed
$26.86
ATP Automotive now offers the widest product offering of automatic transmission control products for the vast majority of import and domestic vehicles. ATP has the best coverage, as well as the highest-quality solenoids, pressure and speed sensors, pressure switches, wire harnesses, and vacuum modulators. ATP automatic transmission shift control solenoids are exact-fit, no-compromise replacement parts. They are manufactured to meet or exceed OEM specifications.
Not Yet Reviewed
$32.99
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