Tool Required VB-FIX Required

Printpartsummary
Symptoms:
  • Excess TCC slip
  • Low converter & lube flow
  • Low cooler flow
  • Overheating
  • TCC apply & release concerns
  • TCC codes
  • TCC lining failure
Cause:

Wear of the TCC control valve bore due to continuous valve oscillation causes multiple TCC and lube/cooler circuit concerns.

Correction:

Recover hydraulic control and restore proper TCC apply/release and cooling circuit operation by installing Sonnax oversized TCC control valve kit.

Tool Required VB-FIX Required

6T40 (Gen. 1), 6T40 (Gen. 2), 6T45 (Gen.1), 6T45 (Gen. 2), 6T50 (Gen. 1), 6T50 (Gen. 2)

Oversized TCC Control Valve Kit

Part No.

144510-05K

Oversized TCC Control Valve Kit
  • 144510-05k_combo

  • Oversized TCC Control Valve Kit

Small_144510-05k_combo Small_144510-05k

6T40 (Gen. 1), 6T40 (Gen. 2), 6T45 (Gen.1), 6T45 (Gen. 2), 6T50 (Gen. 1), 6T50 (Gen. 2)

Oversized TCC Control Valve Kit

Part No. 144510-05K

  • Valve
  • Spring

Complaint:

  • Excess TCC slip
  • Low converter & lube flow
  • Low cooler flow
  • Overheating
  • TCC apply & release concerns
  • TCC codes
  • TCC lining failure

Cause:

Wear of the TCC control valve bore due to continuous valve oscillation causes multiple TCC and lube/cooler circuit concerns.


Correction:

Recover hydraulic control and restore proper TCC apply/release and cooling circuit operation by installing Sonnax oversized TCC control valve kit.

Common concerns associated with listed GM transmissions are TCC slip, TCC lining degradation, TCC slip codes, and converter apply or release issues. These problems are often caused by excess wear at the TCC control valve bore. In addition, converter/lube and cooler flow can be restricted, resulting in an overheat situation. Reconditioning the bore and installing Sonnax oversized TCC control valve kit 144510-05K restores hydraulic integrity for renewed TCC, lubrication and cooler operation.

Proper TCC control relies on correct line pressure; if line pressure problems are discovered, Sonnax offers oversized pressure regulator valve kit 144510-01K.

  • Hardcoat anodized aluminum valve combats premature wear
NOTE:

Prior to reaming TCC control valve bore, a 1/2" spacer plate must be inserted between pump and VB-FIX. See instructions for details.

Required Tools

Related Parts

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.

  • Test Locations

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Valve Body Layouts

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.

Valve Body Layout GM 6T40 (Gen. 1), 6T45 (Gen.1), 6T50 (Gen.1)

Related Tech Articles

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