Wear in the pressure regulating bore and wear on the valve is a common issue occurring in Toyota/Lexus UA80E, UA80F, UB80E and UB80F FWD and AWD transmissions. This wear minimizes line pressure control, resulting in irregular line pressure readings and burnt transmission components.
Reconditioning the bore and installing Sonnax oversized pressure regulator valve kit 168740-06K eliminates crucial line pressure escaping the circuit and restores OE functionality and pressure specifications. The length of the major diameter outboard spool of the oversized Sonnax valve was increased by 27% to help prevent future side-loading wear. Annular grooves added on the critical diameters of the valve helps keep the valve centered in the bore as it fluctuates positions. The O-ringed end plug provides a positive seal and prevents critical line pressure from exhausting from the circuit. These Sonnax feautures ensure your units will have proper line pressure control throughout all drive ranges.