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.

Warning:

There are some small diameter and length differences that can cause fit and pressure issues if mismatched into the wrong application. It is recommended to measure the locations shown here to verify that the correct OE or replacement part is fit into the appropriate application during rebuild.

Application A B C D E F G
ZF6 Gen. 1, 6R60, 6R75, 6R80 ('09–'14) .645" .629" Dia. .495" Dia. .568" .378" .629" Dia. .550" Dia.
ZF6 Gen. 1 w/ 053 Separator Plate .725" .657" Dia. .511" Dia. .649" .378" .657" Dia. .586" Dia.
ZF6 Gen. 2 .804" .629" Dia. .511" Dia. .725" .418" .629" Dia. .562" Dia.
6R80 ('15-Later), 6R100 .645" .629" Dia. .511" Dia. .568" .378" .629" Dia. .550" Dia.

ZF6HP21, ZF6HP28, ZF6HP34

Pressure Regulator Sleeve
Part No. 95740-29K

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

Wear is commonly found in ZF6HP19/26/32 (Gen. 2) pressure regulator bores allowing 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. 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
Learn More About Zip Valve™ Drop-In Repairs

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
  • 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