September 30, 2005
Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits
Gregg Nader
Symptoms:
- Harsh downshifts
- TCC apply & release concerns
- TCC codes
- Cycling TCC RPM
- Overheated fluid
Cause:
Wear at the plunger/sleeve assembly results in the converter remaining applied and transferring shift shock. Loss of lube pressure and control timing also results in RPM fluctuation.Correction:
Sonnax drop-in 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
Lockup Control Plunger Valve Kit
Part No. 147741-37K
You need this if...
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Listed Toyota/Lexus transmissions can have complaints associated with a worn plunger valve and sleeve which includes harsh 2-3 and harsh coast downshifts. This is due to the converter clutch remaining applied. When the plunger valve and sleeve wear, this can delay TCC apply, the vehicle RPM may surge or set gear ratio codes due to high slip rates. Installing the Sonnax drop-in lockup control plunger valve kit 147741-37K can restore correct lube pressure and valve control timing when bore wear at the lockup clutch control valve is not an issue.
- Restores OE function
- Drop-in Zip Valve™ parts install quickly and easily
- No tools or reaming required
- Valve
- 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
