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• There are 2 OEM designs for the converter regulator valve in AXODE AX4S AX4N 4F50N transmissions. Continuous oscillation of either version of the valve in the cast-aluminum valve body bore results in bore wear and converter feed oil leakage to exhaust. The AXODE/AX4S and ’96 and earlier AX4N applications have a 4-spooled valve, while the ’97 and later AX4Ns have a 2-spooled valve. The 4-spooled version has a 4 pound spring, wears the bore, and then may stick in the bore, preventing regulation and restricting flow. The 2-spooled version has 33 pounds of spring force and less valve-to-bore contact, which makes it prone to accelerated bore wear. The Sonnax oversized converter regulator valve kit re-establishes the hydraulic integrity of the valve-to-bore fit, and prevents valuable converter feed oil leakage.

The 96201-23K kit replaces both the original 4-spooled converter regulator valve and the original 2-spooled version. Valve is manufactured from hard-coat anodized aluminum and incorporates four valve spools to provide better stability and prevent bore wear. Annular grooves have also been added to center the valve in the bore and prevent side loading that leads to bore wear.
Two replacement springs are included to compensate for the oversized valve, to reduce the excessive spring force that accelerates bore wear, and to work with either the original 2- or 4-spooled OEM design.
A reamer tool kit that works for all applications, 96201-TL3, is necessary to enlarge the bore to accept the oversized valves.