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Symptoms:
  • Burnt clutches
  • Clutch slippage
  • Converter concerns
  • Harsh shifts
  • High line pressure
  • Low cooler flow
  • Low line pressure
  • No cooler flow
  • Overheated transmission
  • Soft shifts
Cause:

Continuous oscillation of pressure regulator valve results in excess bore wear, causing erratic line pressure and/or restricting cooler/lube flow.

Correction:

Recover hydraulic control and renew line pressue performance by installing Sonnax pressure regulator valve kit.

6L45, 6L50, 6L80, 6L90

Pressure Regulator Valve Kit

Part No.

104520-03K

Pressure Regulator Valve Kit
  • 104520-03k_combo

  • Pressure Regulator Valve Kit

  • 104520-03k_tools

Small_104520-03k_combo Small_104520-03k_valve Small_104520-03k_tools

6L45, 6L50, 6L80, 6L90

Pressure Regulator Valve Kit

Part No. 104520-03K

  • Valve
  • Drill Bit
  • Checkballs (2) 1 Extra

Complaint:

  • Burnt clutches
  • Clutch slippage
  • Converter concerns
  • Harsh shifts
  • High line pressure
  • Low cooler flow
  • Low line pressure
  • No cooler flow
  • Overheated transmission
  • Soft shifts

Cause:

Continuous oscillation of pressure regulator valve results in excess bore wear, causing erratic line pressure and/or restricting cooler/lube flow.


Correction:

Recover hydraulic control and renew line pressue performance by installing Sonnax pressure regulator valve kit.

GM 6L45, 6L50, 6L80 and 6L90 units may exhibit multiple line pressure and cooler/converter/lube flow problems due to excess wear in the pressure regulator bore. Deterioration 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. Installing Sonnax pressure regulator valve kit 104520-03K restores the hydraulic integrity of these circuits for proper line pressure control in all ranges.

  • Hardcoat anodized aluminum valve combats premature wear
  • Lengthened critical spools operate in non-worn portion of bore for added stability and wear prevention.
  • Annular grooves help center valve in bore to reduce future side-load wear
  • No reaming or special tools required
NOTE:

Pump must be removed to install kit.

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 6L45, 6L50, 6L80, 6L90

Related Tech Articles

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GM 6L45-6L90 Vacuum Test Guide

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