Sonnax Industries Parts | Summit Racing

Sonnax Zip Kits

Sonnax Zip kits are engineered to cure common problems associated with today's automatic transmissions. Sonnax Zip kits eliminate: * Burnt clutches * Line pressure instability * Loss of fuel economy * No line rise * Pressure loss * Shift concerns * TCC apply and release concerns * TCC codes * Pressure switch codes

4.78 out of 5 stars ( 9 )

$99.59

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$235.14

Sonnax Slip Yokes

Sonnax slip yokes are forged, not cast, for greater strength, and they undergo a precision-machining process to guarantee exceptional balance and minimal runout. They are 100 percent leak-tested, the seal plug is O.D. ground for superior seal, and yokes are air-tested to 40 psi. Sonnax slip yokes are available in different lengths and tooth counts to fit your specific transmission application.

4.85 out of 5 stars ( 106 )

$156.02

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$305.44

Sonnax Flanged Yokes

Sonnax flanged yokes will complete your driveshaft connection. These high performance 6061-T6 aluminum parts are precision-machined to be stronger than the original cast steel yokes, as well as being lighter in weight. Sonnax builds these yokes for exceptional balance and superior craftsmanship, for a show-quality driveline.

5.0 out of 5 stars ( 22 )

$45.50

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$282.02

Sonnax Input Carrier Kits

Sonnax input carrier kits transform OE wide-ratio automatic transmissions into a close ratio for game-changing acceleration on the track. Manufactured and engineered for outstanding durability, these kits keep your engine in the optimal power band, while allowing a longer pull in first and second gears, improving consistency and performance. The input carrier gears are precision-ground to OE standards and feature thrust washers with a highly wear-resistant, PTFE-coated material, plus a thicker captured bearing. Lube channels direct oil to the pinion pins, and the carrier can be disassembled for inspection and service. Stay in the power band with Sonnax input carrier kits.

5.0 out of 5 stars ( 3 )

$855.99

Sonnax Heavy-Duty One-Piece Input Shafts

No weak link! Sonnax heavy-duty one-piece input shafts are custom-forged from one solid piece of ultra-high-strength 300M steel. Much better than the weak OE 2-piece shaft/hub design, this single piece delivers a more robust build that will work hard longer. With durability and performance features which are second to none; your only choice should be Sonnax heavy-duty one-piece input shafts.

Not Yet Reviewed

$440.14

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$984.25

Sonnax Shift Improver Performance Packs

Sonnax shift improver performance packs combine innovative heavy-duty performance calibration for firmer shifts under load without sacrificing low-speed drivability. The precision components in these kits upgrade your transmission for maximum achievement and durability by recalibrating pressures, recalibrating shift accumulation, and including improved parts for areas that commonly wear. They are suitable for any heavy-duty application and are a critical foundation for other upgrades when modifying the transmission for high performance use. Sonnax shift improver performance packs additional facts and features: * Shorter shifts, which get progressively firmer with load * Faster pressure increase and higher overall pressure for greater clutch/band holding power * Three ultra-reliable, patented, billet pinless accumulator pistons * Unique 1-2 accumulator spring combination for shifts with character * Improved high rpm pressure * Third accumulator valve gets the 2-3 right the first time, every time * Consistent results, no guessing on calibration * Prevents worn accumulators and separator plate * Optional TCC on-off conversion prevents excess TCC pressure

5.0 out of 5 stars ( 6 )

$166.28

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$356.54

Sonnax Primary and Secondary Pressure Sensors

No one knows transmissions like Sonnax, which is why their primary and secondary pressure sensors work exactly like your OEM parts. Gearbox pressure sensors determine the hydraulic oil pressure in various applications and help to specify the shifting pressure more accurately. This type of sensor may fail to function under hostile conditions or simply wear over time. When that happens, help keep your drivetrain running optimally with the Sonnax primary and secondary pressure sensors designed for your application.

5.0 out of 5 stars ( 1 )

$93.90

Sonnax Servo Piston Kits

If you're looking for an easy upgrade to your automatic transmission, Sonnax Servo piston kits may be the answer. The improvement in shift quality is an immediate and noticeable value. These direct replacement kits will help to eliminate a bit of a "sloppy" gear performance caused by faulty OEM servo units. With all necessary rings and seals to prevent leakage and handle higher pressure, Sonnax servo pistons can be your link to greater band apply force. Choose the kit that matches your vehicle specs, then expect faster and firmer shifts!

4.76 out of 5 stars ( 29 )

$15.14

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$352.46

Sonnax Overrun Clutch Valve Kits

Sonnax Smart-Tech overrun clutch valve kits offer a hydraulic solution to this known mechanical problem. With unique rerouting of hydraulic fluid pressure, this patented kit keeps the overrun clutch applied at all times—except overdrive 4th gear—reinforcing the roller clutch to adequately support heavy loads. Order the model recommended for your transmission application.

5.0 out of 5 stars ( 1 )

$178.60

Sonnax 10-Clutch Drum Kits

Sonnax 10-clutch drum kits are optimized for Powerglide performance applications. Using the patented Sonnax 10-clutch drum system, the drum and piston accept 10 frictions and 10 Kolene steels, increasing lockup surface to allow significantly more torque than modified OE drums. The drum features a piston bore that is .060 in. deeper for greater piston travel. Kits include: * Complete 10-clutch drum kit with all related parts, including installed PTFE-coated bushing * Includes ten .060 in. frictions and ten .060 in. thick, 12-tooth Kolene steels * Excess material removed from high-strength, cast steel drum to reduce rotating mass * 6061 forged aluminum piston will not crack at high operating pressure like cast pistons * Forged chromoly steel clutch hub with lightening holes

5.0 out of 5 stars ( 1 )

$490.36

Sonnax Automatic Transmission Governors

A bad governor will result in a sudden loss of upshift. Sonnax automatic transmission governors will restore proper function on select automatic transmissions. Their governor gears are excellent replacement components and they are made of premium materials to provide a precise fit with OE quality and function for long-lasting performance.

4.4 out of 5 stars ( 20 )

$145.67

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$170.21

Sonnax Heavy-Duty Reaction Shaft Kits

Sonnax heavy-duty reaction shaft kits are universal to fit all years and all input carriers. Reaction shafts used in high-torque applications, and especially in heavy vehicles, suffer from two common issues that require replacement. The splines that engage the rear planet can twist and the splines that engage the ring gear wear. OE and other aftermarket versions are made from lower strength, plain carbon steel. Sonnax heavy-duty reaction shaft kits are made from high-strength chromoly steel alloy to eliminate spline twist and spline wear. Contents include: * Reaction shaft with bushings * Reaction shaft-to-shell bearing * Reaction shaft-to-front carrier bearing * Shim

5.0 out of 5 stars ( 4 )

$217.22

Sonnax Smart-Tech Direct Clutch Drum and Shaft Kits

Failure of the intermediate stub shaft and direct drum are almost inevitable when transmissions are pushed to the limit. To maximize durability and improve clutch capacity in heavy-duty/performance vehicles, Sonnax offers Smart-Tech direct clutch drum and shaft kits, the first upgrade to eliminate every critical weakness. Most failures in these units occur where the direct drum and stub shaft connect. Even other aftermarket upgrades that rely on a heavy-duty shaft will sheer in this area under extreme conditions. Unlike two-piece assemblies, the all-in-one Smart-Tech easily handles the highest horsepower/torque levels. The unique one-piece clutch drum with integrated stub shaft is precision machined from high-strength steel to guarantee there are no splines to strip from the drum or weaken the shaft. The shaft itself is significantly thicker and 2 times stronger than the original. Due to its larger diameter, the integrated shaft must be used with the kit's custom, heavy-duty sun gear. Insufficient holding power is another area where many transmissions fall short, but installing thinner aftermarket steels and backing plates to increase clutch capacity isn't ideal. Those components increase clutch pack flex and heat build-up, making them the primary cause of repeat burn-up. To improve both performance and long-term reliability, the Smart-Tech's custom drum and piston hold an OE backing plate and seven OE frictions for 17 percent more clutch capacity than the six-friction stack-up. Sonnax Smart-Tech direct clutch drum and shaft kits feature: * One-piece design that eliminates weak point where drum splines strip and shafts break * Rugged shaft is 50 percent thicker and twice as strong as OE * Custom drum and piston deliver 17 percent more clutch capacity with optimum protection against burn-up * High-strength drum and shaft are precision-machined from hardened 8620 steel * Unique sun gear is precision-machined from 9310, heat-treated steel

5.0 out of 5 stars ( 1 )

$754.00

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$770.64

Sonnax Clutch Apply Piston Kits

Sonnax clutch apply piston kits drastically reduce the likelihood of clutch plate distortion. Due to OE design shortcomings, flexing and bowing of the backing plate is common in some GM transmissions, often causing them to suffer failure of the 4-5-6 clutch assembly. These kits increase the piston-to-plate apply ring surface area to strengthen and reinforce the assembly, along with a more rigid backing plate design that outperforms OE and aftermarket components. Sonnax clutch apply piston kits easily tackle these common weaknesses. Kits include: * Apply piston * Apply ring * Piston dam * Backing plate

4.75 out of 5 stars ( 4 )

$162.50

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$228.71

Sonnax Heavy-Duty Automatic Transmission Output Shafts

Sonnax heavy-duty automatic transmission output shafts allow energy to be absorbed via their torsional design, reducing peak power loads to critical areas. This, in turn, prevents shaft failure common in certain GM units. These steel output shafts are precision engineered and manufactured for unbeatable performance in high-horsepower street and strip builds. They're available in various lengths, and feature many unique refinements available only from Sonnax.

5.0 out of 5 stars ( 2 )

$710.03

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$774.01

Sonnax Mustang Flanged Yokes

Sonnax Mustang flanged yokes are for the builders of Mustang driveshafts who want to upgrade from a 1330 U-joint. Those builders have long had to make due with purchasing an extra adapter flange to allow installation of a 1350 flange yoke. Now, with Sonnax flange yokes, the days of sourcing an extra adapter are over. Sonnax yokes are forged and precision-machined to accept a 1350 U-joint while maintaining compatibility with the OE 3.5 in. bolt circle.

4.75 out of 5 stars ( 4 )

$137.91

Sonnax Billet Forward Clutch Pistons

These Sonnax billet forward clutch pistons improve forward clutch piston strength and durability by using billet aluminum—and they're made with additional contours at points of high stress. These rebuild components can be used individually or with Sonnax input housing reinforcement sleeve kits. No alterations or fabrication is needed to use them in conjunction with aluminum overrun pistons. Sonnax billet forward clutch pistons can be used in both early and late model automatic transmissions, as noted in the application.

2.0 out of 5 stars ( 1 )

$96.28

Sonnax Automatic Transmission Electro-Hydraulic Control Modules

The GM 6L80 and 6L90 TEHCM houses the transmission control module (TCM), or computer. The eight solenoids are connected to the TCM via a lead frame, all of which are over-molded in the plastic housing and not accessible or serviceable separately. Component fails and circuit faults in the GM 6L80 and 6L90 TEHCM are common, and result in drivability complaints and trouble codes which can only be remedied with a replacement unit. These automatic transmission electro-hydraulic control modules by Sonnax serve as a durable, reliable OE performance solution at a significant savings over OE replacement. Each Sonnax TEHCM GM6L-TEHCM-C6 unit goes through a rigorous cleaning and inspection process where all failed components are replaced. Electro-hydraulic testing in a simulated drive test ensures full functional performance consistent with a new OE TEHCM. A vehicle VIN remains on the Sonnax remanufactured TEHCM and will be overwritten by a transmission shop technician with the new vehicle VIN during the reprogramming process. After installation, the TEHCM must be reprogrammed on the vehicle using a J2534 device in order to function correctly. The fully tested TEHCM is serialized, and the test data stored and packaged in Mylar bag with a protective connector cover to prevent inadvertent static discharge issues during the shipping, handling and receiving processes. Part information details: * Ultrasonically cleaned and thorough flushing of solenoids to remove all dirt and debris—no matter how hidden * New pressure switches installed * New filter plate/screen included * Fully electro-hydraulically tested to comply with OE performance * Must be reprogrammed after installation using a J2534 device for proper function

3.0 out of 5 stars ( 1 )

$218.67

Sonnax Lube Regulated Pressure Regulator Valves

The OE pressure regulator valve design prevents adequate cooler flow at low rpm and high-pressure conditions, which can create overheating. Additionally, in 1999 and later vehicles, the factory EPC pressure was set high at idle, resulting in engine surge conditions in GM 4L80-E and 4L85-E units. Sonnax lube-regulated pressure regulator valves provide a significant increase in cooler flow under low rpm and high-pressure conditions that benefits all vehicles—and eliminates the need for reprogramming 1999 and later vehicles with high EPC pressure at idle.

4.89 out of 5 stars ( 18 )

$17.40

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$84.84

Sonnax Heavy-Duty Intermediate Overrun Outer Races

Sonnax heavy-duty intermediate overrun clutch outer races eliminate weak points. Race failure is a chronic problem with high-torque loads causing race fractures at two stress points: the radial lube holes and the sharp inside corners at the base of the outer splines. Sonnax outer races are engineered with offset lube holes so rollers never travel directly over the holes, and they are spaced so only one roller is ever positioned near a hole, radically reducing the risk of fracture. Other design improvements to the splines, plus upgraded material and a custom manufacturing process, further improve durability, doubling the torque capacity over any OE or other aftermarket races. Sonnax heavy-duty intermediate overrun clutch outer races are direct replacements offering unrivaled reliability at any power level.

5.0 out of 5 stars ( 2 )

$101.10

Sonnax Clutch Backing Plates

GM 6L80 and 6L90 transmissions often suffer failure of the 4-5-6 clutch assembly due to flexing and bowing of the backing plate (coning)—especially when your clutch-apply pressures exceed OE specifications. Sonnax clutch backing plates are designed to minimize flexing/bowing when the clutch is applied, drastically reducing the likelihood of clutch plate distortion. Their stiffer backing plate design outperforms OE and aftermarket plates.

5.0 out of 5 stars ( 7 )

$50.44

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$132.87

Sonnax Input Housing Sleeve Kits

Input housing failure at the shaft and forward piston areas is common in high-torque 4L60, 4L60-E, 4L65-E, and 4L70-E transmissions. Also, the input drum assembly is known to crack and strip out splines where the input shaft is pressed into it (where the overrun piston rides). Sonnax input housing sleeve kits—forward sleeve kits and overrun sleeve kits—when used in combination with each other, greatly increase the maximum strength of the housing for additional torque capacity and can prevent these failures. Sonnax input housing overrun and forward sleeve kits are offered separately. Both sleeves feature high-strength, chromoly construction that increases housing torque capacity by protecting the shaft and either the forward piston or overrun piston areas. Each kit will include piston, reinforcement sleeve, and outer and inner piston seal.

5.0 out of 5 stars ( 1 )

$100.36

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$229.75

Sonnax Case Saver Retainers

Sonnax case saver retainers are designed for 1999 and later GM 4L80-E units—and are the only intermediate clutch retaining ring case saver that allows the intermediate band to be retained. The case savers fit over the intermediate band anchor lug inside the case and extends rearward to support the intermediate clutch backing plate retaining ring, preventing case lug blow-out. Over the years there have been a variety of case saver designs, however, all required eliminating the intermediate band, as is often done in drag racing trans-brake applications. Only Sonnax case saver retainers support the intermediate clutch retaining ring yet are thin enough to allow the intermediate band to be installed to provide case lug protection in all applications.

4.4 out of 5 stars ( 5 )

$35.60

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$35.99

Sonnax Heavy-Duty Remanufactured Valve Bodies

Sonnax heavy-duty remanufactured valve bodies are built to overcome chronic shift and converter clutch apply complaints. It provides firmer shifts and a moderately increased pressure curve to improve performance, especially in truck and towing applications. Numerous Sonnax valve upgrades are included to restore hydraulic clearances that lead to shift complaints, clutch distress, converter complaints and codes, solenoid issues and pressure problems. Line pressure rise has been moderately increased to overcome shift complaints, delayed engagements, and to increase holding power to the clutches. To guarantee the highest level of operational performance, this remanufactured valve body is tested on state-of-the art equipment to verify that solenoid feed, clutch, converter, and line pressures match or exceed OE specifications. Choose your preferred kit packaged for your transmission. The valve body includes the following: * Oversized TCC regulator valve and sleeve, and limit valve spring for firmer TCC application * O-ringed bore plugs and abuse plugs * New accumulator control valve and sleeve with spring * Oversized AFL line up * New forward accumulator piston and seal * New pressure switch manifold * New EPC solenoid * New TCC PWM solenoid Kit contents: * Remanufactured valve body * Separator plate * Upper case gasket plate * Lower valve body gasket plate * 1-2, 3-4 accumulator springs * EPC solenoid harness adapter for 2003 to later units * Sonnax line pressure booster kit

4.5 out of 5 stars ( 2 )

$372.32

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$582.46

Sonnax Transmission Parts