C1 Apply Boost Valve Kit 168740-01K Helps cure: Delayed engagement C1 Clutch burned Poor shift quality
C4 Apply Boost Valve Kit 168740-02K Helps cure: C4 Clutch burned 4th & 6th Gear shift concerns Poor shift quality
Forward/Reverse Accumulator Piston Kit 168740-05K Fits either of two locations. Helps cure: Slips in Forward & Reverse Delayed engagement Poor shift quality Harsh engagement
Modified Lube Flow Control Valve Kit 168740-16K Helps cure: Lube failures Overheated fluid Inadequate lubrication
O-Ringed End Plug Kit 168740-10K Helps cure: Poor shift quality Pressure loss Various concerns depending on location of leaking end plug
Oversized Cooler/Lube Flow Control Valve Kit 168740-08K Helps cure: Inadequate lubrication Lube failures due to lack of cooler flow Overheated fluid Tooling: F-168740-TL8 VB-FIX
Oversized Pressure Regulator Valve Kit 168740-06K Helps cure: Burnt clutches Low line pressure High line pressure Burnt transmission components Tooling: F-168740-TL6 VB-FIX
Solenoid Damper Kit 168740-12K Fits one of eight locations. Helps cure: Poor shift quality Burnt clutches Delayed engagement TCC apply & release concerns Low line pressure Loss of shift solenoid control pressure
TCCRV & TCCV Damper Kit 168740-11K Helps cure: Lube failures Overheated fluid Cooler drain back Overheated converter Delayed engagement
December 11, 2023 Understanding Lube Flow Control Valves in Toyota/Lexus UA80, UB80 Transmissions Jim Dial