September 30, 2005
Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits
Gregg Nader
Symptoms:
- TCC apply & release concerns
- Harsh downshifts
- RPM fluctuation
- TCC codes
Cause:
Wear at the lockup control valve results in the converter remaining applied and transferring shift shock. Loss of lube pressure and control timing also results in RPM fluctuation.Correction:
Sonnax oversized lockup control plunger valve kit corrects lost lube pressure and control timing issues caused by a worn OE plunger valve and sleeve.A750E, A750F, A761E, A960E, A960F
Oversized Lockup Control Valve Kit
Part No. 147741-16K
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Tooling:
- F-147741-TL16
- VB-FIX
You need this if... View Instructions Find a Distributor
Toyota/Lexus A750, A761 and A960 series transmissions can have harsh 2-3 and harsh coast downshift complaints associated with bore wear at the lockup control valve. This is due to the converter clutch remaning applied. When bore wear delays TCC apply, the vehicle RPM may surge or set gear ratio codes due to high slip rates. Installing Sonnax oversized lockup control valve kit 147741-16K can restore correct lube pressure and valve control timing.
- Restores correct lube pressure
- Re-establishes valve control timing
- Lockup Control Valve
- Plunger Valve
- Plunger Sleeve
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
Toyota/Lexus A760E/F/H, A761E, A960E/F, AB60 Valve Body Layout
Toyota/Lexus A750E/F Valve Body Layout
January 16, 2014
Toyota A750E-A761E Identification Guide
December 03, 2013
