Tool Required

Printpartsummary
Symptoms:
  • Code 39, 741
  • Overheated converter
  • TCC apply & release concerns
Cause:

Continuous oscillation of the converter regulator valve in the cast-aluminum bore causes bore wear, which results in apply oil leakage.

Correction:

The Sonnax kit provides more support for the valve during oscillation and restores hydraulic integrity.

Tool Required

4T80-E

TCC Regulator Valve Kit

Part No.

72854-03K

TCC Regulator Valve  Kit
  • 72854-03k_combo

  • TCC Regulator Valve  Kit

Small_72854-03k_combo Small_72854-03k

4T80-E

TCC Regulator Valve Kit

Part No. 72854-03K

  • Sleeve
  • Valve
  • Springs (3)
  • Washer
  • O-Ringed End Plug

Complaint:

  • Code 39, 741
  • Overheated converter
  • TCC apply & release concerns

Cause:

Continuous oscillation of the converter regulator valve in the cast-aluminum bore causes bore wear, which results in apply oil leakage.


Correction:

The Sonnax kit provides more support for the valve during oscillation and restores hydraulic integrity.

Continuous oscillation of the converter regulator valve in the cast-aluminum bore causes bore wear, which allows apply oil to leak to exhaust. Another area of concern is the valve bore end plug. The continuous movement of the regulator valve and spring causes the end plug to wiggle in the bore. This movement wears the plug and bore, resulting in balance regulated apply oil leaking to exhaust, which can prevent the converter clutch from applying and set codes.

  • The Sonnax sleeved TCC regulator valve kit contains an anodized valve with elongated spools and a highly wear-resistant aluminum sleeve to prevent bore wear
  • Kit re-establishes the hydraulic integrity of the valve-to-bore fit, and provides much more support for the stroking valve
  • An O-ringed end plug has also been added to the kit to better seal the balance port
  • Two replacement regulating springs are included in the kit so that the regulating pressure can be returned to the stock setting, or for a firmer apply with less slippage

Required Tools

You need this if...

A vacuumtest at either port indicated fails to hold 18" of vacuum or higher, or if visual wear is detected.

  • Test Locations

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Contact a Sonnax Distributor to purchase this part.