Product Description
Fits: 6L45, 6L50, 6L80, 6L90
- Tooling:
- VB-06
- F-104520-TL7C
- VB-FIX
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.
Reconditioning the bore and installing Sonnax oversized pressure regulator and boost valve kit 104520-16K re-establishes the hydraulic integrity of these circuits for proper line pressure control in all ranges.
- Oversized pressure regulator valve and matched spring restore OE function
- Annular grooves help center valves in bore to reduce future side-load wear
- Hardcoat anodized aluminum valves combat premature wear
- No pump drilling required
Notes
Pump must be removed to install this kit. Use of the VB-06 is required with the VB-FIX reaming fixture for this installation unless the stator support shaft is removed from the pump body. This kit replaces the original Sonnax oversized pressure regulator and boost valve kit 104520-07K. If you have the discontinued kit and need instructions, you can find them here.
Symptoms
- Erratic line pressure
- High line pressure
- Low line pressure
- Clutch slippage
- Harsh shifts
- Low cooler flow
- Burnt clutches
- No cooler flow
- Overheated transmission
- Converter concerns
Cause
Continuous oscillation of pressure regulator valve results in excess bore wear, causing erratic line pressure and/or restricting cooler/lube flow. Wear at the boost sleeve causes Reverse issues.
Correction
Recover hydraulic control and renew line pressure performance by reconditioning the bore and installing Sonnax oversized pressure regulator and boost valve kit.
Contents
- Pressure Regulator Valve
- Spring
- Boost Valve
- Boost Sleeve
- Checkball
Valve Body Layout
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.
GM 6L45, 6L50, 6L80, 6L90 Valve Body Layout
