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


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.


Install Sonnax drop-in TCC apply valve kit to restore hydraulic integrity.

4T60, 4T60-E

TCC Apply Valve Kit
Part No. 84754-22K

'96-Earlier with steel valve

You need this if... View Instructions Find a Distributor

In GM 4T60 and 4T60-E units, the TCC apply valve acts as the switch valve for converter apply and release. The TCC regulator valve 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. Installing Sonnax TCC apply valve kit 84754-16K restores hydraulic integrity.

  • PTFE seal prevents loss of signal oil that strokes the valve
  • Oversized versions available to restore the valve body bore
  • Tool kit services both early and late models
  • Drop-in Zip Valve™ parts install quickly and easily
Learn More About Zip Valve™ Drop-In Repairs
  • Valve
  • Seal PTFE
  • Spring
  • Material: Steel

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.

GM 4T60, 4T60-E Valve Body Layout

GM 4T60, 4T60-E Valve Body Layout

  • 4T60, 4T60-E TCC Apply Valve Kit 84754-22K
  • 4T60, 4T60-E TCC Apply Valve Kit 84754-22K
  • 4T60, 4T60-E TCC Apply Valve Kit 84754-22K details

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.

4T60, 4T60-E TCC Apply Valve Kit Vacuum Test Locations