Wear at the multiple accumulator bores on these various units is very common. This wear allows component apply oil to exhaust, resulting in delayed engagements, slipping or flare shifts and burned clutches. Drop-in-place Sonnax accumulator piston kit 57917E-19K incorporates an O-ring for positive sealing, even in worn bores.

• No machining or special tools required
• O-Ring provides positive seal even in worn bores
• O-Ringed piston fits multiple locations

In listed Toyota/Lexus units, the continuous oscillation of the secondary regulator valve wears the valve spools and valve body bore at the contacting surfaces. Such wear results in TCC pressure irregularities and valve instability. If pressure is high, harsh lockup clutch engagement can result. If the pressure is too low, the TC clutch cannot achieve complete lockup. Continuous clutch slippage will lead to burned clutch material and converter. Under these conditions loss of mileage and poor drive-ability are to be expected. Reconditioning the bore and installing Sonnax oversized secondary pressure regulator valve kit 57917E-16K restores proper hydraulic function.

• Hardcoat anodized aluminum valve combats premature wear
• Oversized valve and included matched spring restore OE regulated pressure specifications
• Kit allows salvage of previously non-repairable valve bodies and avoids searching for, and purchase of, expensive replacement valve bodies

In Toyota/Lexus U140E, U140F, U240E and U241E units, the steel OE solenoid modulator valve is prone to side-loading in the bore. This side-loading action, combined with repeated oscillation of the valve, prematurely wears the cast aluminum bore causing shift and TCC concerns. Sonnax solenoid modulator valve kit 57917E-13K restores normal solenoid supply pressures.

• High-grade aluminum sleeve resists wear and provides porting to prevent valve side-loading
• Hardcoat anodized aluminum valve combats premature wear, incorporates annular grooves to prevent side-loading
• Replacement spring resets regulated pressure to OE specification

Toyota/Lexus vehicles with U140E, U140F, U240E and U241E transmissions may exhibit insufficient line rise in the drive ranges, excessively high pressures in Reverse and shift issues. This may be caused by continuous oscillation of the pressure regulator valve and boost valves causing severe wear. Sonnax oversized pressure regulator and boost valve kit 57917E-08K has upgraded materials to prevent wear and minimal clearances to restore proper hydraulic control.

• A new spring is included to work with the oversized valve and re-establish OE regulated pressure specifications
• Kit includes an increased ratio boost valve assembly specially designed to work with the oversized regulator valve

The noted Toyota transmissions may exhibit poor shift quality due to wear in the clutch apply control plunger sleeve. As the OE steel plunger valve oscillates in the cast aluminum bore, wear occurs. This prevents proper control of the inboard clutch apply control valve, resulting in problems with sequencing of clutch apply and release, which may cause flares and binds on up or downshifts. Ultimately this can lead to clutch failure. Sonnax clutch apply control plunger valve kit 57917E-05K restores proper hydraulic clearances to ensure correct sequencing of clutch apply and release. Improved wear-resistant materials are used to provide durability and prevent future wear.

• Ssleeve is manufactured from highly wear-resistant billet aluminum
• Hardcoat anodized aluminum valve combats premature wear
• Annular grooves have been added to the valve to prevent sideloading related wear

Toyota/Lexus U140E, U140F, U151E, U151F, U240E, U241E and U250E transmissions use a lockup control plunger valve to appropriately position the lockup control valve for converter apply and release. Wear of this plunger sleeve can result in converter apply pressure exhausting, resulting in TCC apply & release concerns, TCC codes, and a burnt converter. Replacing the worn sleeve and plunger with Sonnax lockup control plunger valve kit 57917E-03K restores proper control at this location.

• Hardcoat anodized aluminum valve combats premature wear
• Annular grooves have been added to the valve to prevent sideloading-related wear

Toyota/Lexus vehicles with U140E, U140F, U240E and U241E transmissions may exhibit insufficient line rise in the drive ranges and excessive high pressures in Reverse. This may be caused by continuous oscillation of the steel boost valve within the cast-aluminum sleeve, creating excessive wear and a path for EPC and Reverse pressures to leak. Sonnax boost valve kit 57917E-01K has upgraded materials to prevent wear and to restore proper hydraulic control.

• Boost sleeve manufactured from highly wear-resistant billet aluminum to prevent the excessive wear exhibited by the cast OE sleeve
• Hardcoat anodized aluminum valve combats premature wear
• Restores proper line rise

Vehicles with Toyota/Lexus U760E and U760F transmissions may exhibit second and sixth gear shift timing concerns such as flares and bind-ups, slipping, or loss of second and sixth gear operation altogether. Burnt B1 brake clutches and loss of manual first may also result. These problems are often caused by persistent oscillation of the steel B1 apply boost valve within the aluminum boost sleeve, creating excess wear and a path for circuit pressure to exhaust, preventing proper clutch application. Installing Sonnax B1 apply boost valve kit 47740-40K re-establishes the hydraulic integrity of this circuit, restoring normal shift operation.

• Annular grooves help center valve in bore to reduce future side-load wear
• Hardcoat anodized aluminum valve combats premature wear
• Sleeve manufactured from highly wear-resistant aluminum for maximum life

Vehicles with Toyota/Lexus U760E and U760F transmissions may exhibit insufficient line rise in Reverse, delayed or slipping Reverse, and/or burned C3, B1, and B4 clutches. Continuous oscillation of OE steel boost valve within aluminum boost sleeve causes premature wear, creating a path for boost pressure to exhaust. Installing improved material Sonnax reverse boost valve kit 47740-38K restores the hydraulic integrity of the boost circuit to recover normal Reverse operation.

• Restores proper line rise
• Annular grooves help center valve in bore to reduce future side-load wear
• Hardcoat anodized aluminum valve combats premature wear
• Sleeve manufactured from highly wear-resistant aluminum to prevent excess wear and leakage

Toyota/Lexus vehicles equipped with U760E and U760F transmissions often exhibit several common concerns related to wear in the lockup control valve bore. Oscillation of the lockup control valve and stroking of the plunger valve in its sleeve results in wear that prevents full hydraulic control of the lockup circuit. TCC slip, RPM surge, harsh downshifts and/or slip codes can accompany the TCC apply/release concerns that develop in these cases. Sonnax oversized lockup control valve kit 47740-31K allows the bore to be refurbished, restoring normal TCC operation.

• Hardcoat anodized aluminum valves combat premature wear
• Annular grooves help center valves in bore and sleeve to reduce future side-load wear