Symptoms:

  • Erratic line pressure
  • Broken parts due to excessive line pressure
  • High line pressure
  • Restricted converter/lube flow

Cause:

Excessive valve and bore clearance allows critical line pressure balance fluid to cross-leak to exhaust, causing high pressure, broken parts and flow to the converter/lube circuit to be restricted.

Correction:

Sonnax drop-in, direct-replacement pressure regulator sleeve addresses sleeve wear and circuit integrity of line pressure balance in the pressure regulator circuit.

ZF6HP21, ZF6HP28, ZF6HP34

Pressure Regulator Sleeve
Part No. 95740-29K

You need this if... View Instructions Find a Distributor

The Sonnax pressure regulator sleeve 95740-29K addresses sleeve wear and circuit integrity of line pressure balance in the pressure regulator circuit.

  • Sleeve is highly wear-resistant to increase life
  • Direct replacement, no special tools required
  • Drop-in Zip Valve™ installs quickly and easily

Kit is NOT compatible with ZF6HP19/26/32 (Gen.1) units. To differentiate between Gen. 1 and Gen. 2 valve bodies, see ZF Identification Guide.

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

ZF6HP21/28/34 (Gen. 2) Valve Body Layout

ZF6HP21/28/34 (Gen. 2) Valve Body Layout
  • ZF6HP21, ZF6HP28, ZF6HP34 Pressure Regulator Sleeve 95740-29K
  • ZF6HP21, ZF6HP28, ZF6HP34 Pressure Regulator Sleeve 95740-29K
  • ZF6HP21, ZF6HP28, ZF6HP34 Pressure Regulator Sleeve 95740-29K details

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.

ZF6HP21, ZF6HP28, ZF6HP34 Pressure Regulator Sleeve Vacuum Test Locations