• Repeated clutch failure
  • Soft upshifts
  • Delayed Reverse
  • High line pressure in Reverse


Severe wear of the boost valve assembly allows TV and Reverse boost oil leakage.


Sonnax closely toleranced, drop-in boost valve and sleeve restores hydraulic integrity and prevents oil leakage.

A130, A131, A140

Boost Valve Kit
Part No. 89010-01K

Low Ratio

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Toyota/Lexus vehicles equipped with an A130, A131 and A140 transaxle may exhibit insufficient line rise in the drive ranges and excessively high pressures in Reverse. This may be caused by extreme wear of the boost sleeve. Wear allows TV oil to exhaust through the manual valve in drive ranges and Reverse oil can enter the TV circuit, forcing the pressure regulator valve into a high pressure position. Sonnax boost valve kits 89010-01K and 89010-02K will restore the hydraulic integrity of these circuits by preventing cross leakage.

  • Sleeves are made from high-quality aluminum for better wear resistance
  • Hardcoat anodized aluminum valve combats premature wear
  • Drop-in Zip Valve™ parts install quickly and easily
Learn More About Zip Valve™ Drop-In Repairs
  • Sleeve
  • Valve
  • A130, A131, A140 Boost Valve Kit 89010-01K
  • A130, A131, A140 Boost Valve Kit 89010-01K