Transmission Parts ZF ZF6HP21 ZF6HP28 ZF6HP34 Valve Body Valve / Sleeve

Symptoms:

5-4 Flare
5-4 Neutral
No 4-5
VFS 1/A solenoid control code
Delayed Forward
Harsh Forward

Cause:

OE boost sleeve wears prematurely, allowing critical pressure loss and/or seizure of valve within sleeve.

Correction:

Recover hydraulic control and renew shift performance by installing Sonnax drop-in clutch A & E control boost valve kit.

ZF6HP21, ZF6HP28, ZF6HP34

Clutch A & E Control Boost Valve Kit
Part No. 95740-28K

Sevices 2 bores

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ZF6HP21/28/34 (Gen. 2) transmissions are equipped with an aluminum sleeve for the clutch A and E control boost valve. This material is prone to wear from valve plunger reciprocation. Failure of this sleeve results in a variety of shift problems and solenoid codes. The Sonnax clutch A and E control boost valve kit 95740-28K will restore the correct hydraulic clearance and proper function of the assembly.

Hardcoat anodized aluminum valve combats premature wear
Sleeve is highly wear-resistant to increase service life
Drop-in Zip Valve™ parts install quickly and easily

Learn More About Zip Valve™ Drop-In Repairs

Note

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.

Contents

Valves (2)
Sleeves (2)

Valve Body Layout

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.