September 30, 2005
Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits
Gregg Nader
Symptoms:
- TCC codes
- TCC apply & release concerns
- RPM surge on coast
- Harsh downshifts
- Overheated fluid
Cause:
Bore wear at the TCC control valve and/or sleeve results in the converter remaining applied and transferring the shift shock. Loss of control also results in RPM fluctuation.Correction:
Sonnax lockup clutch control valve kit corrects lost lube pressure and unsynchronized control timing caused by worn components in the lockup clutch control valve train and/or bore.09D, TR-60SN
Lockup Clutch Control Valve Kit
Part No. 25741-29K
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Tooling:
- F-25741-TL29
- VB-FIX
You need this if... View Instructions Find a Distributor
Aisin AW TR-60SN and VW/Audi 09D transmission complaints associated with bore wear at the TCC lockup control valve include harsh 2-3 and harsh coast downshifts. This is due to the converter clutch remaining applied. When bore wear delays TCC apply, the vehicle RPM may surge or set gear ratio codes due to high slip rates. Installing Sonnax lockup clutch control valve kit 25741-29K will restore correct lube pressure and valve control timing.
- Salvages previously nonrepairable worn valve bodies and avoids expensive valve body replacement
- Highly wear-resistant sleeves provide additional support to the lockup and plunger valves
- Hardcoat anodized aluminum valves combat premature wear
- New spring maintains OE operating pressures and TCC timing
- Lockup Clutch Control Valve
- Lockup Clutch Control Sleeve
- Plunger Valve
- Plunger Sleeve
- Plunger Spring
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.
Aisin AW TR-60SN Valve Body Layout
January 26, 2015
