Tool Required VB-FIX Required
- Broken parts due to excessive line pressure
- Erratic line pressure
- Flare shifts
- Harsh shifts
- High line pressure
- Restricted converter/lube flow
- Soft shifts
- TCC slip
Excess pressure regulator bore/sleeve wear allows fluid loss and/or causes valve hang-up, preventing normal line pressure control.
Restore appropriate line pressure in all ranges by reconditioning the bore and installing Sonnax oversized pressure regulator valve kit.
Oversized Pressure Regulator Valve Kit
Fits units with 053 separator plate only. Verify OE valve & sleeve measurements before use.
OE valve name: SYS.DR-V
Vehicles equipped with ZF6HP19, ZF6HP26 and ZF6HP32 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
Kit is NOT compatible with ZF6HP21/28/34 (Gen.2) units. To differentiate between Gen. 1 and Gen. 2 valve bodies, see ZF Identification Guide.
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Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected. Valve must be positioned as shown to obtain an accurate vacuum test. A 6mm Allen socket and a screwdriver works well for this procedure. Screwdriver pushes sleeve outboard while the Allen socket positions the valve inboard. Vacuum test plate corner will fit snugly between screwdriver and socket to test outer port.
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Valve Body Layouts
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