Vehicles equipped with ZF6HP19/21/32 (Gen. 1) transmissions often develop erratic or high line pressure due to excessive wear in the OE pressure regulator bore and/or sleeve. This wear allows critical oil loss, preventing proper line pressure regulation. Without correct oil pressure, the PR valve will be out of its desired position, resulting in line pressure instability and possibly restricting cooler and lube flow. Reconditioning the bore and installing Sonnax oversized pressure regulator valve kit 95740-78K renews pressure regulator action for revived line pressure control in all ranges.

Hardcoat anodized aluminum valve combats premature wear
Sleeve manufactured from highly wear-resistant aluminum

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