Automatic Transmission Valve Bodies
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- Mopar®Automatic Transmission Valve Body Channel PlateAutomatic Transmission Valve Body Channel Plate by Mopar®. Designed utilizing the latest technology, this product by Mopar features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$26.64 - $1,096.38
- Mopar®Automatic Transmission Valve Body Check BallAutomatic Transmission Valve Body Check Ball by Mopar®. Designed utilizing the latest technology, this product by Mopar features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$2.34 - $57.26
- Mopar®Automatic Transmission Valve Body Sealing SleeveAutomatic Transmission Valve Body Sealing Sleeve by Mopar®. Designed utilizing the latest technology, this product by Mopar features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is...$21.19 - $21.98
- Mahle®Automatic Transmission Valve Body GasketAutomatic Transmission Valve Body Gasket by Mahle®. Designed utilizing the latest technology, this product features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$9.57 - $10.81
- ATS Diesel Performance®Trim Valve KitTrim Valve Kit by ATS Diesel Performance®. The control center of a transmission is the valve body. It controls transmission operation, torque converter control, shift feel and ultimately, transmission reliability. ATS used a pro-active...Increased Transmission LubricationConverts Electrical Signals into Hydraulic Actions$165.91
- BD Diesel Performance®Automatic Transmission Torque Converter Lock-Up ControlAutomatic Transmission Torque Converter Lock-Up Control by BD Diesel Performance®. Designed utilizing the latest technology, this product by BD Diesel Performance features premium quality and will perform better than advertised. Perfect...Includes New On/Off Valve assembly to replace OEM PWM valve assembly in pumpConverts long soft pulse (PWM) lock-up to short crisp On/Off lockup, with longer converter life$115.95
- BD Diesel Performance®Automatic Transmission Valve Body Accumulator KitAutomatic Transmission Valve Body Accumulator Kit by BD Diesel Performance®. BD's exchange valve bodies are modified, tuned and tested to provide optimum performance in towing and performance applications. The end result is improved...Modified, tuned and tested to provide optimum performanceRevised valve design$452.95
- BD Diesel Performance®ProTect68 Automatic Transmission Separator Plate & Gasket KitProTect68 Automatic Transmission Separator Plate & Gasket Kit by BD Diesel Performance®. Designed utilizing the latest technology, this product by BD Diesel Performance features premium quality and will perform better than advertised....Allows for the removal of the problematic OEM cooler bypass tube assemblyHandy preventative maintenance item when installing transmissions, coolers and filter kits, or, performing general service work$235.95
- California Pony Cars®Servo Piston and Cover KitServo Piston and Cover Kit by California Pony Cars®. C Servo Piston & Cover Kit to fit automatic transmission. This is the transmission that came in the factory equipped and other Hi-Po cars. Kits comes complete with all gaskets and...Perfect blend of leading innovations and superior workmanshipManufactured to offer high value and everlasting reliability$169.99
- J.W. Performance®Billet Dual O-Ring Servo PistonBillet Dual O-Ring Servo Piston by J.W. Performance®. Accumulator Piston Material: Aluminum. Billet Aluminum Dual O-Ring Provides positive low band apply. Features iclude dual o-ring seals, and increased volume.Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$36.40
- J.W. Performance®Billet Servo CoverBillet Servo Cover by J.W. Performance®. Billet Aluminum Servo Cover Provides increased rigidity to minimize leaks at the servo cover. Designed utilizing the latest technology, this product by J.W. Performance features premium quality...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$39.30 - $74.25
- Sonnax®High Performance Automatic Transmission Accumulator Piston KitHigh Performance Automatic Transmission Accumulator Piston Kit by Sonnax®. Enhance drivetrain strength, performance, and durability and keep your transmission performing at its best with the industry’s best automotive components from...Designed to improve your vehicle’s performance for more enjoyable ridesManufactured from premium materials to offer a long-lasting service life$34.31 - $107.41
- Sonnax®High Performance Automatic Transmission Line Pressure Booster KitHigh Performance Automatic Transmission Line Pressure Booster Kit by Sonnax®. Sonnax hydraulic line pressure booster kits contain stronger pressure regulator springs and large ratio boost valves designed to work together to provide...Achieve shorter shifts and increased torque capacity without creating low-speed harshnessImproved band and clutch holding capacity for increased durability$17.61 - $97.32
- Sonnax®High Performance Automatic Transmission Servo Return Spring KitHigh Performance Automatic Transmission Servo Return Spring Kit by Sonnax®. Race-Calibrated. Mystery band failures in OE transmissions are a common result of using inconsistent aftermarket servo return springs and weak OE springs prone...Designed to improve your vehicle’s performance for more enjoyable ridesManufactured from premium materials to offer a long-lasting service life$16.17
- Sonnax®High Performance Automatic Transmission Valve Body Recalibration KitHigh Performance Automatic Transmission Valve Body Recalibration Kit by Sonnax®. The Sonnax Performance Pack is a must-have for any heavy-duty vehicle and the very best foundation for high-performance racing. All components work...Consistent, firmer shifts under load without sacrificing low-speed drivability or guessing on calibrationFaster pressure increase and higher overall pressure for greater clutch/band holding power$187.15 - $218.22
- Sonnax®High Performance Extreme Heavy Duty Automatic Transmission Line Pressure Modulator Plunger Valve KitHigh Performance Extreme Heavy Duty Automatic Transmission Line Pressure Modulator Plunger Valve Kit by Sonnax®. Enhance drivetrain strength, performance, and durability and keep your transmission performing at its best with the...Designed to improve your vehicle’s performance for more enjoyable ridesManufactured from premium materials to offer a long-lasting service life$29.64
- Sonnax®High Performance Heavy Duty Automatic Transmission Shift ValveHigh Performance Heavy Duty Automatic Transmission Shift Valve by Sonnax®. Enhance drivetrain strength, performance, and durability and keep your transmission performing at its best with the industry’s best automotive components from...Improves input sprag and Forward clutch durabilityCritical upgrade for all heavy-duty and performance vehicles$37.13
- Sonnax®High Performance High Performance Automatic Transmission Pressure Regulator SpringHigh Performance High Performance Automatic Transmission Pressure Regulator Spring by Sonnax®. Enhance drivetrain strength, performance, and durability and keep your transmission performing at its best with the industry’s best...Designed to improve your vehicle’s performance for more enjoyable ridesManufactured from premium materials to offer a long-lasting service life$8.44
- Sonnax®Zip Kit™ Valve Body Repair KitZip Kit™ Valve Body Repair Kit by Sonnax®. The kit contains uniquely designed parts to prevent the loss of pressures within the main line, clutch apply control and lockup control circuits. The kit also seals multiple circuits known to...No reaming requiredInstalls quickly with no special tools required$103.55 - $278.23
- Transtar Industries®Automatic Transmission Clutch Accumulator PistonAutomatic Transmission Clutch Accumulator Piston by Transtar Industries®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of...Superior in durability and wear resistanceSuperior proprietary coating for maximum durability$8.64
- Transtar Industries®Automatic Transmission Clutch Accumulator Piston & Seal KitAutomatic Transmission Clutch Accumulator Piston & Seal Kit by Transtar Industries®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of...Superior in durability and wear resistanceSuperior proprietary coating for maximum durability$8.64
- ACDelco®Genuine GM Parts™ Automatic Transmission Band Servo Piston and Cover Seal KitGenuine GM Parts™ Automatic Transmission Band Servo Piston and Cover Seal Kit by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$5.64
- Mopar®Automatic Transmission Solenoid KitAutomatic Transmission Solenoid Kit by Mopar®. Designed utilizing the latest technology, this product by Mopar features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$28.72 - $343.42
- ACDelco®GM Genuine Parts Automatic Transmission Clutch Pack Piston Return SpringGM Genuine Parts Automatic Transmission Clutch Pack Piston Return Spring by ACDelco®. GM Genuine Parts Automatic Transmission Clutch Pack Piston Return Springs are designed, engineered, and tested to rigorous standards, and are backed...Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors$21.73 - $33.83
- ACDelco®GM Genuine Parts Automatic Transmission Valve Body Separator PlateGM Genuine Parts Automatic Transmission Valve Body Separator Plate by ACDelco®. GM Genuine Parts Automatic Transmission Valve Body Separator Plates are designed, engineered, and tested to rigorous standards, and are backed by General...Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors$10.87 - $24.58
- ACDelco®Genuine GM Parts™ Automatic Transmission Torque Converter Clutch Pressure PlateGenuine GM Parts™ Automatic Transmission Torque Converter Clutch Pressure Plate by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$45.65
- Mopar®Automatic Transmission Accumulator Piston Pin Retaining RingAutomatic Transmission Accumulator Piston Pin Retaining Ring by Mopar®. Designed utilizing the latest technology, this product by Mopar features premium quality and will perform better than advertised. Perfect for your vehicle and...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$17.19
- Mopar®Automatic Transmission Brake BandAutomatic Transmission Brake Band by Mopar®. Designed utilizing the latest technology, this product by Mopar features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$3.53 - $21.82
- Mopar®Automatic Transmission Fluid Pipe RetainerAutomatic Transmission Fluid Pipe Retainer by Mopar®. Designed utilizing the latest technology, this product by Mopar features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$2.74 - $6.17
- Mopar®Transmission Regulator Valve ScreenTransmission Regulator Valve Screen by Mopar®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Carefully crafted from premium materialsExcellent corrosion and wear resistance$2.69
The valve body is the automatic transmission’s hydraulic control center. Automatic transmissions use planetary gearsets for all forward gears and reverse. Clutches and bands, applied by hydraulic pressure, are the components used to control the planetary members – the sun gear, outer ring gear, and the planetary gears in between – to shift gears. Transmission fluid that is pressurized by the transmission oil pump flows to the valve body and the pressurized fluid is then directed by the valve body to the appropriate clutches and bands. The valve body in your transmission or related valve body components may be failing if you’re experiencing delayed shifts, hard shifts, improper shift timing, shift flares, or noise. If one or more parts prove faulty, we have the OE quality replacement valve bodies & components to restore transmission performance.
The valve body is a structure containing valves and numerous fluid passageways that is bolted to the underside of the transmission case, just above the fluid pan. It may have multiple sections and is usually installed to the transmission with a separator plate and gasket. Several types of valves are used in valve bodies including check balls, poppet valves and spool valves. Check balls seat on the valve body and separator plate where they allow or block fluid flow. Poppet valves are balls or flat discs with stems that guide opening and closing, and like check balls they also allow or block fluid flow. Spool valves are the most familiar type of valve. Spool valves consist of a stem with large circular sections called lands that fit into bores in the valve body, separated by stemmed areas called valleys. When the spool valve is activated by fluid pressure, spring pressure or linkage, the lands block fluid flow and the valleys allow it.
A typical valve body has a manual valve and valves for enacting specific gear changes, as well as pressure control valves, and depending on model year application may also have other valves including a throttle valve, and a valve for the TCC (Torque Converter Clutch). The manual valve is controlled by the driver via the shift lever and directs fluid pressure to the appropriate clutches and bands when the transmission is placed in Park, Drive, Neutral or Reverse. For example, when the transmission is placed in Drive, fluid is directed to the clutch that controls first gear. For an automatic transmission to shift at the proper time and with the necessary firmness, the load on the engine must be communicated to the transmission. On modern computer controlled vehicles, the transfer of engine load information takes place electronically, but on older vehicles a vacuum modulator or TV (Throttle Valve) cable is used to signal engine load to a throttle valve, and the governor and throttle valve control hydraulic pressure in the transmission.
On older, non-electronically controlled transmissions, the transmission pump supplies fluid to the governor and throttle valve, which in turn direct fluid to the shift valves in the valve body. The transmission output shaft drives the governor, which builds pressure directly in relation to vehicle speed. Under light acceleration, the throttle valve does not have much effect on the shift valve and governor-controlled shifts are earlier and softer. Under hard acceleration, when engine load is high, the throttle valve will act against the shift valve to force governor pressure higher. This delays the shift and supplies higher pressure to the transmission bands and clutches, giving them the clamping power needed to control members of the transmission’s planetary gearset and enact firm, hard shifts. The throttle valve detects engine load via a vacuum modulator or TV cable.
On electronically controlled transmissions, shift timing and firmness are controlled by a computer. Depending on the vehicle, model year and system, the transmission may be controlled by a PCM (Powertrain Control Module), which controls both the engine and transmission, or by a dedicated TCM (Transmission Control Module). A network of engine and transmission sensors and switches provides input to the computer about operating conditions including engine load, temperature, and vehicle speed. The computer uses this input, along with internal programming, to manipulate fluid pressure and flow via electric solenoids in the valve body. There are pressure control solenoids, shift solenoids that direct fluid pressure to the appropriate clutches or bands, and a solenoid that directs fluid pressure to engage the TCC. A solenoid contains a coil of wire with an iron plunger inside. When current is applied to the solenoid it becomes an electromagnet and the plunger changes position. When the plunger moves it opens or closes a valve, allowing or preventing fluid flow.
When shift valves are actuated, pressurized fluid is sent to pistons in clutch packs or servos that apply bands to shift gears. Accumulators are devices in valve bodies that are designed to affect shift feel. An accumulator contains a piston and spring in a bore that is connected at both ends to fluid pressure. When fluid pressure from a shift valve is first applied to a clutch or band, the pressure forces the piston down against the spring, thereby absorbing some of the pressure and preventing a harsh shift. However, under hard acceleration, when there is greater engine torque and more pressure is needed to apply the clutch or band, throttle pressure acts on the opposite end of the piston, preventing easy accumulator piston movement and resulting in a firmer shift.
When the symptoms described in the first paragraph above are experienced on vehicles with computer controlled transmissions, they may be accompanied by a CHECK ENGINE or other malfunction indicator light illuminating on the dash. A scan tool should be connected to the vehicle’s diagnostic link connector to check for diagnostic trouble codes. The cause of the transmission problem may not be in the hydraulic circuits, but with a sensor, actuator, controller or some other part of the electronic control system. Pressure testing can reveal defects in the valves and valve body. If a valve body problem is suspected, it should be disassembled and all components thoroughly inspected for wear, which could be caused by extensive use, poor maintenance or a combination of the two. If the transmission fluid has not been changed regularly, or the transmission has overheated or there is a problem in another part of the transmission, the fluid could have reduced lubricating capabilities and there may be a buildup of varnish and contaminants in the fluid, which can cause sticking or worn valves.
No matter what you’re working on, we have the replacement automatic transmission valve body & components needed to restore long-lasting performance and durability to your transmission. You’ll also find performance components in our store. What can a performance automatic transmission valve body do to your vehicle that a stock one cannot? The main thing is that it quickens up gear changes and modifies the shift points when the gear shift happens. It also makes your driving much smoother with gear shifting that is crisper and more powerful. An upgraded valve body won't just improve your overall driving experience, it will also add more durability to your automatic transmission.
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