Sonnax 104520-15K Pressure Regulator Valve Kit for GM 6L45 6L50 6L80 6L90 Transmissions

The Sonnax 104520-15K Pressure Regulator Valve Kit is a drop-in replacement solution designed to restore proper hydraulic control in GM 6L45, 6L50, 6L80, and 6L90 automatic transmissions. This kit addresses common line pressure problems caused by excess wear in the pressure regulator bore that can lead to harsh shifts, soft shifts, overheating, and clutch failure.

Key Features:

• Hardcoat anodized aluminum valve construction resists premature wear
• Lengthened critical spools operate in non-worn portions of the bore for improved stability
• Annular grooves help center the valve to reduce future side-load wear
• Includes upgraded outer spring that provides a modest 5 PSI increase across the pressure curve
• Drop-in Zip Valve™ design requires no pump drilling for faster installation
• Includes valve, spring, and 1/8" aluminum checkball

Addresses Common Problems:

• High line pressure and harsh shifts due to balance spool end deterioration
• Low line pressure and soft shifts from outboard spool wear
• Reduced cooler and converter flow causing transmission overheating
• Burnt clutches from inadequate line pressure control

This kit replaces the discontinued Sonnax part number 104520-14K and offers the same effective repair without the additional step of pump drilling. The transmission and pump must be removed from the vehicle for installation. Compatible with various GM vehicles including Cadillac, Chevrolet, and GMC models equipped with 6L series transmissions.