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:

The Sonnax 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 direct replacement pressure regulator sleeve 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

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 tests at the ports indicated fails to hold the recommended minimum of in-Hg

ZF6HP21, ZF6HP28, ZF6HP34 Pressure Regulator Sleeve Vacuum Test Locations