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.
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
Dorman 4WD vacuum delete wheel end couplers provide an OE Fix to these high-failure prone parts. Dorman patented replacement wheel couplers are designed for long-lasting durability and trouble-free performance, plus they come as a complete kits, including all required components for a complete repair. These direct replacements are made of corrosion-resistant high-quality materials, and will deliver a proper fit every time.
( 3 )
$134.95
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
Summit Bucks
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
$6.60
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
Motorcraft 4WD vacuum regulator valves help restore the 4-wheel drive functionality of your vehicle. They allow the engagement and disengagement of your front wheels as required. They are manufactured to OE standards for fit, form, and function. Motorcraft vacuum regulators will get your 4WD working again.
Not Yet Reviewed
$50.99
These converter lockup kits from Painless give you an inexpensive way to automatically lock up the torque converter in 4th gear, when retrofitting a GM 700R4 transmission into an early non-computer controlled vehicle. The kits include everything you need for an easy installation, and you don't even need a speed sensor! Kit includes: * Vacuum switch * 4th gear pressure switch * Brake switch * Torque converter lock-up solenoid * Wire harness * New transmission pan gasket * Mounting hardware
( 21 )
$209.99
Van Steel has been serving the Corvette community for over 40 years, providing parts that are as good as or, in many cases, better than factory. They are ready to help your Corvette ride, drive, and handle to the best of its ability, along with looking and driving the way you want it to. Van Steel wheel hub assemblies come complete with Timken USA bearings and races and a corrosive-resistant coating. In these front hubs, the races will be installed along with new stock size wheel studs, and a new castle nut, cotter pin, washer, and grease cap are included. Each hub is inspected after the races are installed for proper run-out spec to ensure optimal braking performance and no pad knock. Choose the kit specified for your Corvette.
( 2 )
$316.99
How can you take the guess work out of the hardest part of rebuilding your bearing assemblies? Van Steel loaded bearing supports allow you to rebuild your trailing arms without purchasing a bearing setup tool. Available in left hand and right hand versions, these reproductions of the originals contain Timken bearings, SKF seals, and a new dust shield, plus the spacer and shim are set to Van Steel specs. Reduce your rebuild time and utilize Van Steel's bearing specs with their loaded bearing supports.
( 2 )
$241.99
Van Steel offers X-Tracker wheel bearing and hub assemblies for a variety of vehicles—including Chevrolet Corvette applications from 2010 and up. These replacement units are manufactured to precision specifications using premium heat-treated high-carbon steel for superior strength and problem-free performance. Order the front or rear model recommended for your vehicle.
Not Yet Reviewed
$399.99
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$409.99
Van Steel has been serving the Corvette community for over 40 years, providing parts that are as good as or, in many cases, better than factory. They are ready to help your Corvette ride, drive, and handle to the best of its ability, along with looking and driving the way you want it to. Van Steel front wheel bearing and spindle rebuild kits contain top-quality components needed for the job—just add backing plates to complete your spindle rebuild. Choose the proper kit for your Corvette year. Kits include: * Timken bearings * SKF seals * Grease caps * Castle nuts * Cotter pins * Spindle washers * Spindle gaskets * Lug studs * Steering arm hardware
Not Yet Reviewed
$131.99
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$174.99
Clearance
Van Steel offers half shafts for a variety of applications, including Chevrolet Corvette models from the 1960s, '70s, and '80s. Half shafts are, essentially, a drive axle that spans roughly half the car, from the wheel to the transaxle or differential. They take power from the vehicle's transmission and differential—and transfer it to the wheels, allowing the vehicle to drive forward. Most kits include two 2.5 in. or 3 in. new shafts, new solid Neapco U-joints, and new flanges. The components have a protective silver paint coating. Order the replacement half shafts recommended for your vehicle.
Not Yet Reviewed
$709.99
$560.50
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$799.99
Installation of these TCI 2004R/700R4 lockup wiring kits makes retrofits into non-ECM 700R4 or 2004R vehicles a snap. They allow automatic operation of the TCC in 4th gear under stable engine operation, and disengage the clutch when accelerating or downshifting. A manual override option is also provided. These TCI torque converter lockup wiring kits are constructed from OEM connectors and oil-resistant wire.
( 61 )
$159.95
ATI torsional input shafts work like a torsional spring bar--twisting and returning to totally eliminate breakage, while reducing shock loads to the gear train. They are manufactured from top-quality 300M or Vasco for maximum durability. Available for GM Powerglide or TH400 splines, these ATI torsional input shafts will add some reliability to your drivetrain.
( 11 )
$189.95
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$860.99
The Jeep NP231 is one of the most popular transfer cases, but it creates an extremely short rear driveshaft. These fixed yoke kits from Advance Adapters add 3 to 4 in. to the rear driveline length on a YJ, and up to 6 in. on a TJ. This results in a better driveshaft angle, eliminated driveline vibrations, and a transfer case that's ideal for trail use.
( 62 )
$258.76
Summit Racing™ torque converter lockup kits are a simple way to control converter clutch lockup in 4th gear when swapping a GM 700R4 or 200-4R transmission in an early non-computer controlled vehicle. The adjustable vacuum switch will hold the clutch on during steady state cruising and disengage when accelerating or downshifting. Summit Racing™ torque converter lockup kits are available in automatic (+12V applied via vacuum switch) and manual (+12V applied via toggle switch) versions. Choose the one preferred for your application.
( 6 )
$89.99
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$149.99
FTI Performance offers options for Powerglide input shafts. Their selection allows you to choose the strength and pricing to fit your horsepower and budget. From forged 4340 steel to forged 300M to CNC-machined ER100 that is virtually unbreakable, FTI Performance delivers the level of performance you want and need with their variety of Powerglide input shafts.
( 7 )
$189.00
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$219.00
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 )
$10.99
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$63.99
In late 1980s to mid 90s, Jeep used a vacuum actuator to shift the transfer case and corresponding front axles in and out of 2WD, and high or low 4WD. Crown Automotive 4WD front axle actuators will replace faulty vacuum switches to improve your vehicle's get-up-and-go, no matter the terrain.
( 8 )
$33.99
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$174.99
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
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