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Symptoms:

  • Low cooler flow
  • Shudder
  • Code 39, 740, 1870
  • Falls out of lockup when hot
  • Overheated converter

Cause:

Wear of the TCC apply valve bore allows leakage of TCC signal oil to exhaust and the apply valve to move into the TCC release position.

Correction:

Wear of the TCC apply valve bore allows leakage of TCC signal oil to exhaust and the apply valve to move into the TCC release position.

4T60-E

Oversized TCC Apply Valve Kit
Part No. 84754-97K

1997 & later with aluminum valve


View Instructions

The TCC apply valve acts as the switch valve for converter apply and release. The TCC regulator valve (84754-01K and 84754-08K) controls TCC apply pressure. Both the apply valve and the regulator valve can cause slip codes. When the apply valve is worn, it often returns to the unapply position even though the TCC apply solenoid remains energized. Generally the apply valve causes larger changes in slip RPM as the converter cycles from apply to full release. The regulator valve causes a more gradual load and heat-sensitive slip. Check for changes in slip RPM with a scanner or changes in cooler flow with the Sonnaflow® FM-01KA.

  • PTFE seal prevents loss of signal oil that strokes the valve
  • Oversized versions available to restore the valve body bore
  • Standard-size versions are drop-in replacements and do not require valve body removal
  • Tool kit services both early and late models
  • Valve
  • PTFE Seal
  • Spring

September 30, 2005

Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits

Gregg Nader

Topics: Diagnostics And Theory Transmission

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