Transmission & Drivetrain
Availability
Building awesome horsepower is only part of the story. You need to deliver all that power to your car or truck’s wheels! We’ve got torque-hungry high performance automatic...
Building awesome horsepower is only part of the story. You need to deliver all that power to your car or truck’s wheels! We’ve got torque-hungry high performance automatic and manual transmissions for street and strip applications, torque converters and clutch sets, flexplates and flywheels, plus limited-slip differentials, spools, lockers, ring and pinion sets, driveshafts, U-joints, axles, bearings, C-clip eliminator kits, transfer cases, shift kits, and rebuild kits. We also have a wide selection of trans-brakes, shifters, cables, and accessories—everything you need to put the power to the ground, Summit style.
Building awesome horsepower is only part of the story. You need to deliver all that power to your car or truck’s wheels! We’ve got torque-hungry high performance automatic and manual transmissions for street and strip applications, torque converters and clutch sets, flexplates and flywheels, plus limited-slip differentials, spools, lockers, ring and pinion sets, driveshafts, U-joints, axles, bearings, C-clip eliminator kits, transfer cases, shift kits, and rebuild kits. We also have a wide selection of trans-brakes, shifters, cables, and accessories—everything you need to put the power to the ground, Summit style.
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.
( 31 )
$21.99
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.
( 27 )
$48.35
These Lokar indicator control modules are designed to control the LED indicator display. They are made of billet aluminum and include all necessary mounting hardware. They are available for a dash mount or shifter boot mount, and the LED display is sold separately.
( 7 )
$277.95
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.
( 6 )
$23.95
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$35.95
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
American Powertrain reverse lockout modules are safety devices to save your transmission by preventing shifting into reverse on the freeway. These control solenoids communicate with the vehicle speed sensor in the transmission to let them know you are at zero mph so you can safely shift into reverse, rather than using a signal from the brake pedal.
( 3 )
$135.45
ICT Billet modulator delete plugs allow you to retain the factory modulator valve and lock it into place. They're designed to be used with manual valve bodies. Made from strong billet aluminum, these plugs will not leak or have problems lasting the life of the transmission. Order the model recommended for your transmission make and type.
( 1 )
$11.99
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.
( 46 )
$16.99
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$69.99
Dorman transmission control modules have been thoroughly tested to offer the same function and performance as the stock component, electronically controlling the vehicle's automatic shifting for far less than replacements at the dealer.
( 2 )
$104.95
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$662.99
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.
( 12 )
$33.95
Great for transplants! TransGo Automatic transmission modulator conversion kits provide a more aggressive and tunable pressure boost curve with engine vacuum instead of the vehicle PCM controlling PCS/EPC solenoid. TransGo modulator conversion kits include everything needed to add the internal modulator system with the oil pan off the transmission. From the outside of the transmission, you will need to connect it to an intake manifold vacuum source, however hardware is not provided for this. The kits do come with an oil pan-based resistor to pacify the control module for the missing EPC solenoid in applications where the computer will still manage the gear changes. TransGo includes: * Pressure regulator valve spring and snap ring * Brass fitting * Vacuum modulator, pin, valve, and bushing * Hold-down bracket * Elbow vacuum hose and spring * Four short zip ties * Five long zip ties * Vacuum tee * Resistor
( 2 )
$123.57
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$135.14
FTI Performance billet modulator plugs block off modulator vacuum supply. An O-ring or gasket is included with each plug. Order the model recommended for your transmission application.
( 2 )
$12.29
ATI modulator plug hold-down clamps replace the OEM clamps on your T400. You no longer have to reuse or spend time trying to find these commonly worn-out parts for your build. ATI modulator plug clamps are exact or better-than OE-style replacements, and they will mate perfectly with other OE parts and competition-type shifters without modifying the case. Don't let an old small part ruin your new racing transmission. ATI has exactly what you need for a successful build.
( 2 )
$4.50
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 )
$19.89
These Standard Motor automatic transmission modulators are designed to replace faulty factory units and help restore your factory shift points. They are available for a variety of applications.
Not Yet Reviewed
$4.99
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$85.99
ATI modulator plugs are designed to replace the vacuum modulators. These aluminum plugs are used with manual valve bodies and include O-rings. Order the model recommended for your automatic transmission application.
( 2 )
$17.99
Sonnax offers vacuum modulator plug gaskets for a variety of applications, including GM Powerglide automatic transmissions. These replacement seals are manufactured from factory materials and specifications to ensure proper fitment and long-lasting performance. Sold in sets of 5.
Not Yet Reviewed
$6.53
Know what gear you are in with Classic Instruments gear selector sending unit kits. These kits include a transmission-mounted sensor and interface module that works with Classic Instruments' gear selector gauges or individual LED indicator lights. Features: * Kit includes mounting hardware * Works with most 3- and 4-speed automatic transmissions * Easy push-button calibration * Also works as backup light trigger or neutral safety switch
( 4 )
$178.95
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
Pacific Performance Engineering EPC blockers solve a big problem with the 2011-19 Allison 1000 transmission ... low mainline pressure. Mainline pressure is created by the transmission's oil pump, directed by the valve body to the applied pistons, and creates clamping force on the clutch packs, allowing them to clamp quickly and completely. Reduced or not having enough mainline pressure at the right time means reduced clamping force—not enough to hold the torque of the engine, and when clutch packs slip, they generate excessive heat, destroying the clutch pack material. The stock EPC functions to modulate line pressure. During a shift, the transmission control module commands the EPC to vary mainline pressure. The pressure will rise from 80 up to 230 psi, then after the shift, the pressure drops back down to 80 psi, and at 80 psi the clutch packs don't hold the torque of the engine. Towing heavy loads or adding aftermarket upgrades adds even more stress on the clutch packs. PPE's EPC blocker kits quickly install between the EPC solenoid and the valve body. There is no need to remove the valve body, just drain the transmission fluid, remove the oil pan, and install the EPC blocker. Once installed, the EPC blocker will allow all the available mainline pressure, up to 230 psi, to always reach the applied pistons and clutch packs. An easy alternative to transmission line pressure tuning, you can improve shift quality and increase the ability to hold more horsepower with Pacific Performance Engineering EPC blockers.
Not Yet Reviewed
$49.49
BD Diesel ProTect 68 Trans Pressure Control kits deliver 150 percent of the torque-holding force to stock transmissions like no others can. The industry-leading exclusive custom valve body separator plate and gaskets substantially reduce cross leaks compared to stock and other applications, even with much higher line pressures. An Electronic Pressure Control module delivers up to 250 psi clutch-apply pressure at full throttle, providing 150 percent of the holding force to prevent clutch slippage. All of this without modifying the transmission pump or removing the transmission. These controllers dynamically adjust the hydraulic-apply pressures, based on turbo boost/engine load. No tuning is required. Installation takes 2 to 3 hours to complete without having to do a full transmission relearn—since no internal tolerances have changed. A "fresh" stock transmission will have the ability to handle up to 500 hp. For higher power or demands, a complete BD 68RFE transmission with additional clutches and new designed components is recommended. Order the kit tailored to your vehicle. Product features: * 56 percent more theoretical holding power * Custom bonded gasket valve body separator plate increases line pressure while stopping internal cross leaks * Heavy-duty accumulator plate to prevent blowout * Dynamically adjusts hydraulic-apply pressures based on turbo boost/engine load * Dynamic control ramps up the much larger sweep * Prevents clutch slippage * No full transmission relearn required; quick relearn suggested * Warranty on parts: 12-month/24,000 miles
Not Yet Reviewed
$424.95
A faulty transmission control module can leave you stranded in a hurry—but ACDelco has a direct replacement for your vehicle application. Each module has been thoroughly tested to offer the same function and performance as the OEM parte. Restore smooth shifting with a new transmission control module from ACDelco.
( 1 )
$72.99
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$535.99
These transmission vacuum modulators are built in Fram's innovative facilities and are enhanced by their years of automotive knowledge. Fram has the dependable, high-quality transmission vacuum modulators you need.
Not Yet Reviewed
$19.99
Motorcraft transfer case control modules help you shift your good ol' 4WD in an instant. They give you the ability to use your vehicle's 2WD or 4WD with just the flick of a few buttons. It's useful technology that lets you harness the full potential of your vehicle.
( 1 )
$116.99
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$136.99
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