- Burnt clutches
- Clutch slippage
- Converter concerns
- Harsh shifts
- High line pressure
- Low cooler flow
- Low line pressure
- No cooler flow
- Overheated transmission
- Soft shifts
Continuous oscillation of pressure regulator valve results in excess bore wear, causing erratic line pressure and/or restricting cooler/lube flow.
Recover hydraulic control and renew line pressue performance by installing Sonnax pressure regulator valve kit.
Pressure Regulator Valve Kit
- Drill Bit
- Checkballs (2) 1 Extra
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
Pump must be removed to install kit.
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.
Click here to view PDF if instructions do not appear below.
Valve Body Layouts
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