No one knows transmissions & torque converters like

Sonnax

No one knows transmissions & torque converters like 2008-sonnax-logo-white

Tool Required

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Symptoms:
  • Burnt clutches
  • Erratic line pressure
  • Low converter & lube flow
  • Overheating
  • Poor shift quality
  • TCC apply & release concerns
Cause:

Continuous oscillation of pressure regulator valve results in excess bore wear, causing erratic line pressure and/or restricting converter feed oil.

Correction:

Recover hydraulic control and renew line pressure performance by reconditioning the bore and installing Sonnax oversized pressure regulator valve kit.

Tool Required

Oversized Pressure Regulator Valve Kit

Part No.

84754-46K

4T60, 4T60-E, 4T65-E

  • 84754-46k_combo

  • Oversized Pressure Regulator Valve Kit

Small_84754-46k_combo Small_84754-46k

Oversized Pressure Regulator Valve Kit

Part No. 84754-46K

  • Valve
  • Outer Springs (3)

Complaint:

  • Burnt clutches
  • Erratic line pressure
  • Low converter & lube flow
  • Overheating
  • Poor shift quality
  • TCC apply & release concerns

Cause:

Continuous oscillation of pressure regulator valve results in excess bore wear, causing erratic line pressure and/or restricting converter feed oil.


Correction:

Recover hydraulic control and renew line pressure performance by reconditioning the bore and installing Sonnax oversized pressure regulator valve kit.

Vehicles with GM 4T60, 4T60-E and 4T65-E transmissions may exhibit multiple line pressure and converter-related problems due to excess wear in the main pressure regulator bore. Wear at the balance spool end allows critical fluid loss, resulting in high line pressure, harsh shifts, and overheating due to reduced cooler/converter flow. Wear at the outboard spool robs converter feed pressure and lowers line pressure, resulting in soft shifts and burnt clutches. Reconditioning the bore and installing Sonnax oversized pressure regulator valve kit 84754-46K restores hydraulic integrity for proper line pressure control and improved shifting in all ranges.

  • Case-hardened steel valve combats premature wear
  • Annular groove helps center valve in bore to reduce future side-load wear
NOTE:

OE outer spring varies from unit to unit. Appropriate replacement springs provided in kit; see instructions for details.

Required Tools

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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 4T65-E

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