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Sonnax Externally Adjustable Low/Reverse Servo Kits

Sonnax externally adjustable low/reverse servo kits make band maintenance quick and easy. They offer an ideal way to improve reliability and make staging more consistent and predictable. Checking L/R band adjustment after repeated use is good practice. Unfortunately, OE servos with steel covers are difficult to adjust in a vehicle, so a quick check with such a servo installed is impractical for most racers. Sonnax externally adjustable servos provides an improved design that makes checks and adjustment of the L/R servo easy. There is no cover or access plug to remove because the adjuster itself extends through the cover. A quick check is done simply by pushing on the end of the adjuster and observing the movement of the piston relative to the servo cover. Select the kit designed for your transmission. Features: * Quickly check and adjust the low/reverse band to prevent trans-brake malfunction * Unique servo cover and adjuster design makes in-vehicle band service easy * Works with or without OE 1-2 accumulator piston Included: * 6061 Anodized billet aluminum cover * Piston * Pin * Jam nut * Cover seals -- Two PTFE, one extra * Piston seal * Cover O-ring * Pin O-ring Kit for TH400 will also include: * Cover flange O-ring * Bolts (6) * Washers (6)

Not Yet Reviewed

$353.26

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Sonnax Feed Limit Low Valve Kits

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

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Sonnax Low/Reverse Sprag Rebuild Kits

In some transmissions, the low/reverse sprag elements, end caps, and retainer plates are prone to wear, while the race is often unaffected, resulting in a bind-up going into 2nd gear or a 1-2 flare. Sonnax low/reverse sprag rebuild kits allow replacement of the caps, elements, and retainer plate without the expense of buying a full sprag assembly. Select the kit designed for your transmission. Contents: * Sprag clutch element without race * End caps (2) * Retainer plate * Snap ring

Not Yet Reviewed

$65.32

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Sonnax Low Sprag Race and Bearing Kits

Sonnax low sprag race and bearing kits are ideal replacements for lost or damaged components. They feature a thrust bearing, inner race, and 1.013 in. thickness. If you're looking for parts for your one-way clutch from an industry leader in cutting edge design, a Sonnax low sprag race and bearing kit fits the bill.

4.0 out of 5 stars ( 1 )

$29.76

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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!

4.77 out of 5 stars ( 30 )

$78.01

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$352.46

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Sonnax Adjustable Rear Servo Pin Kits

The Sonnax adjustable rear servo pin kit 34912-01K replaces GM TH400 and '95-earlier 4L80-E servo pins. OE pins have seven different lengths to allow for adjustment of the Low/Reverse band—but are no longer available from GM. The Sonnax pin kit has an adjustment range that covers the five longest OE pins to allow for accurate setting of the Low/Reverse servo piston travel. The pin features an O-ring groove to prevent leakage of line pressure past the case pin bore. Kit contents: * Servo Pin * Screw * (4) Small washers * (1) Large washer * (2) O-Rings

3.0 out of 5 stars ( 2 )

$31.29

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Sonnax Automatic Transmission Servo Pistons

Maintaining your transmission can save you from costly replacement bills. Sonnax automatic transmission replacement servo pistons feature a dual-seal design and can be used with one or two PTFE or OEM-style cast seals. Accompanying replacement components are also available from Sonnax.

Not Yet Reviewed

$62.58

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Sonnax Master Servo Piston Kits

Sonnax master servo piston kits replace your piston and cover with no modifications needed to the case. These direct-fit kits are stronger to handle higher pressure and feature a no-leak, dual O-ring billet aluminum servo for superior sealing.

Not Yet Reviewed

$78.74

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Sonnax Valve Body Detent Ball and Sleeve Kits

The detent ball in the valve body in listed Chrysler automatic transmissions (see Applications tab) wears into the aluminum bore due to continuous movement and vibration of the linkage. This creates excessive looseness in the manual valve lever and allows the manual valve to move out of alignment. No start or being stuck in Park can occur from the manual valve being out of position due to extra clearance. This condition often requires that the valve body be replaced. Sonnax valve body detent ball and sleeve kits allow the valve body to be salvaged. The bore must be oversized using the self-guiding bench reamer included in Sonnax tool kit 22771-TL12. A .096 in. diameter drill bit is also included to allow the retaining pin hole to be redrilled for use with the OE pin. Sonnax detent spring 22771-36 is also available. Additional notes: * Precision steel sleeve restores worn valve body and properly supports the detent ball * Precision-ground steel ball included for optimal fit with the replacement sleeve * Self-guiding bench-style reamer allows casting to be oversized quickly and accurately without specialized equipment * Kit is designed to fit both the short and long OE detent bore designs

Not Yet Reviewed

$16.80

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$17.65

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Sonnax Line Pressure Booster Kits

Sonnax Line pressure booster kits allow you to shift aggressively and then feel the tranny grab the clutches with more power when it changes gear. The larger boost valves and matching regulator springs raise line pressure progressively as higher pressure is commanded. These kits modify the sensor signal, which causes the computer to create a pressure increase. They're installed between the pressure sensor and vehicle harness using OE-style sealed connectors; no modifications are needed to the transmission.

4.43 out of 5 stars ( 14 )

$36.53

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Sonnax Clutch Hubs

Many Sonnax clutch hubs are designed for the extra-duty requirements of drag racing with Powerglide and other GM transmissions, for instance. Machined from a high-quality medium carbon steel forging, most hubs will accept five friction discs for the added load capacity needed in high horsepower race cars. All splines and thrust surfaces are precision-machined to exacting tolerances, and the unique lube hole pattern is designed to reduce drag on the friction discs in low gear. Sonnax clutch hubs are also available with or without lightening holes to reduce rotational weight.

4.63 out of 5 stars ( 16 )

$32.24

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$135.23

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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 )

$166.99

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$356.54

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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.

4.9 out of 5 stars ( 20 )

$17.40

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$84.84

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Sonnax Heavy-Duty Forward Drums

The ideal GM TH400 upgrade for any power level, Sonnax heavy-duty forward drums (34554-01) feature a unique combination of high-strength, light weight, and a cutting-edge design to optimize transmission performance. Racing applications quickly push the heavy, cast-iron OE drum over its limits, with failure most common at the weak point where the shaft and drum connect. The problem can be addressed with a larger spline and lighter-weight aftermarket aluminum drum—but durability becomes a huge issue with wear of the clutch splines, shaft spline connection, and seal ring bore. To dramatically reduce weight and deliver the ultimate in reliability, the Sonnax high-strength, chromoly steel drum is custom-engineered with several lightening features for a low rotating mass. It weighs 3 lbs. less than the OE drum and is just 3 oz. heavier than a common aluminum drum. Weight is reduced carefully, without compromising strength, by ribbing the front of the drum, adding clutch splines (28 vs. 14) and lightening holes, plus reducing the diameter inner section of the drum at the middle seal ring area. This versatile drum upgrade has an oversized 28-tooth shaft-to-drum spline and can be used with a variety of input shaft styles. This includes Sonnax 1 in. diameter, 30-spline heavy-duty input shaft 30280-02, Sonnax 1 1/8 in. diameter, 35-spline big input shaft 35280-02, and other aftermarket shafts with 28-spline connection between shaft and drum: * Ultra-modern drum delivers both high-strength and light weight for unrivaled performance at any power level * Compatible with Sonnax and other aftermarket 28-spline input shafts * Optimized for use with rubber clutch separators for applications with clean neutral setups * Clutch spline major diameter is reduced slightly, and two sets of full-length clutch splines added to back up clutch separators * Lightening holes correspond to input speed sensor locations in aftermarket cases for more accurate converter and shift data * Middle seal is eliminated—an aluminum clutch volume spacer kit 34554-11K is available separately for applications in which clutch fill/drain time may be a concern * Sonnax high-RPM checkball capsule 57510-01 is installed to eliminate pressure drop at high (5500+) RPM, a common problem with OE and other aftermarket checkballs

Not Yet Reviewed

$358.80

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Sonnax Signal Accumulator Pistons

GM 8L45 and 8L90 transmissions often suffer burnt clutches, shift concerns, low line pressure and/or converter apply complaints—due to excess wear in the signal accumulator piston bores in the control solenoid valve body casting. This wear allows valuable VFS signal pressure to exhaust, preventing proper shift control, line pressure regulation, and/or converter clutch apply. Sonnax drop-in signal accumulator piston kits allow bores to be reconditioned quickly and easily with no reaming required. The hydraulic integrity of the VFS signal pressure circuits are re-established, and future wear prevented with positive sealing and wear-resistant components. Features include: * Hardcoat anodized aluminum piston combats premature wear * Annular grooves to reduce wear rate * Highly wear-resistant sleeve to prevent future wear * Positive sealing O-ringed plug prevents leakage in already worn bores * Mating spring to re-establish OE dampening action * Drop-in Zip Valve parts install quickly and easily * Available for a variety of Chevrolet, GMC, and Cadillac transmission applications Kit contents: -- Sleeves (4) -- Pistons (4) -- Springs (4) -- O-rings (6), 2 extra -- End plugs (4)

5.0 out of 5 stars ( 1 )

$47.48

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Sonnax Forward and Reverse Abuse Bore Plugs

If your GM transmission is showing wear of the bore plug in the forward and reverse abuse valve bores that can allow valuable oil pressure to exhaust, Sonnax forward and reverse abuse bore plugs are the solution. They feature a drop-in design with an increased diameter that restores proper clearance in the valve body and no tools are required for installation. These plugs are used in two locations in the valve body: separating the forward abuse and low overrun valves and separating the reverse abuse and 3-2 downshift valves. Put an end to unnecessary oil loss with Sonnax forward & reverse abuse bore plugs. These products are designed to help resolve: * Delayed reverse * Burned 3-4 clutch and bind-up * Burnt low/reverse clutch * Burned 2-4 band

5.0 out of 5 stars ( 1 )

$8.34

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Sonnax Line Pressure Modulator Plunger Valve Kits

Transmissions showing symptoms of soft shifts from 1-2 or 2-3, periodic harsh shifts, or low line rise may be able to correct the problems with one of these Sonnax Line Pressure Modulator Plunger Valve kits. When sleeves become worn, electronic pressure control (EPC) oil can leak past the valve to cause the soft shifts; valves will also stick or hang up through wear, leading to the rough shift issue. Sonnax kits include a replacement modulator sleeve made from carbon steel to combat extreme wear, along with a durable plunger valve crafted from hardened alloy steel. The O-ring helps to prevent EPC oil loss. Sonnax Line Pressure Modulator Plunger Valve kits are produced for fitment on a variety of transmissions, including 6 and small 8-cylinder applications. Select the kit that's tailored to your vehicle.

5.0 out of 5 stars ( 2 )

$28.04

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$42.14

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Sonnax Reverse Boost Valve Kits

Vehicles with GM 200-4R and 4L60 transmissions often have problems with poor reverse boost or upshifts in manual low. These are generally caused by a worn reverse boost valve sleeve or wear at the pump body. Sonnax offers a larger ratio (.283 in.) reverse boost valve kit to restore the hydraulic integrity of the assembly. Due to the differences in the thermal expansion rate of steel and aluminum when the transmission approaches operating temperature, the sleeve has been allowed excessive clearance and scrubs the bore. Additional details: * Sleeve O-rings seal the reverse boost circuit and prevent leakage from the pump body bore * Sleeve and valve are made from hardened steel for increased wear resistance * Sleeve lands have been lengthened to add better sealing and stabilizing capabilities to prevent bore wear * Reverse boost valve spool lands have been lengthened to aid in maintaining hydraulic integrity * Drop-in Zip Valve parts install quickly and easily

Not Yet Reviewed

$22.79

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Sonnax Pressure Regulator and Shuttle Valve Kits

Vehicles with a GM 8L45 or 8L90 automatic transmission may exhibit high or low line pressure that results in harsh/soft shifts, burnt clutches, loss of cooler and lube flow, and overheating of the transmission and converter. These problems may be caused by wear of the pressure regulator bore casting at the VFS signal port area and/or at the shuttle valve sleeve. Wear at the inboard port of the pressure regulator bore allows VFS (throttle) signal pressure to leak, preventing proper action of the pressure regulator valve and potentially allowing it to remain in the low line pressure position. Wear of the shuttle sleeve due to continuous oscillation of the shuttle valve creates a path for balance line pressure at the pressure regulator valve to exhaust, resulting in excessive low line pressure. Sonnax drop-in pressure regulator and shuttle valve kits restore hydraulic integrity to the lineup by addressing wear that subjects the transmission to either excessively high or low line pressure with upgraded materials and unique designs. The pressure regulator valve has been designed with a lengthened spring pocket spool at the VFS signal port area, which provides over double the sealing capability to this critical end of the valve and allows it to operate in unworn portions of the bore. The length of the critical shuttle valve diameter has been significantly lengthened to provide better sealing and durability of the assembly. Additional details: * Hardcoat anodized aluminum valves and highly wear-resistant billet aluminum sleeve combat premature wear * Pressure regulator valve VFS signal spool 200 percent longer than OE and operates in unworn area of the bore * Critical shuttle valve spool made 30 percent longer than OE for added sealing and durability * Drop-in Zip Valve parts install quickly and easily Kit contents: * Pressure regulator valve * Spring * Shuttle valve * Shuttle sleeve

Not Yet Reviewed

$65.06

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Sonnax Pump Slide Pivot Pins

Sonnax pump slide pivot pins are designed as direct replacements for your worn-out components. They're made from through-hardened steel to prevent excessive wear. A worn-out pump slide pivot pin can allow oil to leak past it, resulting in low or high line pressure. These pins help you to overcome that problem, and are available in solid-, grooved-, or punch-styles. Restore the hydraulic integrity of your transmission with the Sonnax pump slide pivot pin designed for your application.

Not Yet Reviewed

$8.11

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Sonnax Intermediate Servo Sleeve Kits

In GM TH350 and TH350C units, the intermediate servo bore becomes scored from repeated cycling. The spring side of the piston has line pressure present in R, N, D. Excess leakage at the servo piston results in low line pressure and delayed engagements. During forward speeds, oil loss affects shift quality and reduces clutch life. To salvage cases, install a Sonnax intermediate servo sleeve kit (35709-01K). * Contains an aluminum sleeve and a replacement piston with a PTFE seal * Drop-in solution requires no machining of the transmission case * Contents: Sleeve, servo piston, and Seal PTFE

Not Yet Reviewed

$29.63

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Sonnax Hydraulic Line Pressure Booster Kits

Sonnax hydraulic line pressure booster kits contain stronger pressure regulator springs and large ratio boost valves designed to work together, providing progressive pressure increases as driving conditions become more demanding. Their springs are approximately 10 percent stronger than OEM and more conservative in impact than other aftermarket kit springs. Large ratio boost valves provide higher pressure incrementally and when it's needed the most. The combination of these springs and valves in the Sonnax hydraulic line pressure booster kits gives you the best of both worlds--a modest pressure increase at the low-end, with a high-end pressure that's equal to or greater than that of other aftermarket kit springs.

4.95 out of 5 stars ( 20 )

$12.53

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$101.03

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Sonnax Automatic Transmission Reverse Servo Spacers

The Sonnax automatic transmission reverse servo spacers provide a simple, low-cost way to add durability to the GM 4L80-E and 4L85-E transmissions and eliminates the need to retrofit early design reverse servo pistons into late units. Due to a design change in 1996, it had been found that the reverse servo piston commonly breaks because it is stressed more than early servos. Installation of Sonnax reverse servo spacers reduce piston stress by increasing the contact area between the aluminum piston and spacer and incorporating a cushion spring washer. The new contact area is over two times the original and the pressure between the piston and the spacer is reduced by 60 percent. The reverse servo spacer kits easily install during assembly and does not require machining or other modifications. Excessively high line pressure in 'Reverse' is directly related to boost valve wear and cross-leaks into the EPC oil circuit. For maximum durability, inspect and replace the boost valve with one of the Sonnax 4L80-E boost valve kits (sold separately). Product features and benefits: * Increased contact area reduces pressure between apply pin and piston by 60 percent * Added Belleville spring washer reduces shock on piston * No machining necessary, drop-in components * Maximum durability for minimal cost

Not Yet Reviewed

$12.91

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Fine Lines Power Steering Hard Lines

Fine Lines offers replacement power steering hard lines for a variety of applications, including numerous classic Chevrolet vehicles from the 1970s. These low-pressure steel lines include fittings and are designed to fit and perform like the originals.

Not Yet Reviewed

$46.98

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$49.65