Wear in the forward and reverse regulating bore and on the major spool areas of the regulating valve is common in the Subaru TR580 continuous variable transmission (CVT). This wear minimizes clutch output pressure control resulting in forward clutch failure, delayed Forward and delayed Reverse.

Reconditioning the bore and installing Sonnax oversized forward and reverse regulating valve kit 823740-05K eliminates the leakage of solenoid pressure fluid to exhaust. The incorporation of annular grooves on the outboard and inboard major diameter spools of the valve ensures the valve functions and operates in the center of the bore. The O-ringed end plug provides a positive seal and prevents critical solenoid pressure fluid from leaking. Both of these Sonnax features ensures your unit will have proper clutch output pressure through all drive ranges.

• O-Ringed end plug provides positive seal to prevent critical secondary pressure fluid from leaking to exhaust
• Hardened carburized steel valve combats premature wear
• Annular grooves help center the valve in the bore to reduce future side-load wear
• New spring restores OE pressure specifications