Sonnax Toyota/Lexus UA80F Transmission

Valve Body (View Valve Body Layout Diagram)

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

End plug for 4-way checkball assembly location only replaces late-style, aluminum plugs.

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

Zip Kit® UA80E-UB80E-ZIP

End plug for 4-way checkball assembly location only replaces late-style, aluminum plugs.

Helps cure:

Delayed engagement
Poor shift quality
Pressure loss
Various shift concerns
Burnt clutches
Overheating
Low converter & lube flow
Loss of shift solenoid control pressure

Other

Tool Kit F-168740-TL6

Tooling:

VB-FIX

Tool Kit F-168740-TL8

Tooling:

VB-FIX

Tech Resources

FEATURED

November 08, 2023

Vacuum Test Guide

Toyota/Lexus UA80E, UA80F, UB80E, UB80F Vacuum Test Guide

March 28, 2024

Valve Body Layout

Toyota/Lexus UA80E/F, UB80E/F Valve Body Layout

December 11, 2023

Understanding Lube Flow Control Valves in Toyota/Lexus UA80, UB80 Transmissions

Jim Dial