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Symptoms:

  • Coastdown Neutral
  • Flare shifts & bind-ups
  • Harsh downshifts
  • Pressure control out-of-range codes

Cause:

Excess wear at clutch A or E control bore allows critical pressure loss that prevents proper clutch action.

Correction:

The Sonnax oversized valve corrects circuit pressure loss and restores control timing of the clutch control valves.

ZF6HP21, ZF6HP28, ZF6HP34

Oversized Clutch A & Clutch E Control Valve Kit
Part No. 95740-66K

This kit will fit in either clutch A or E control bore locations in M-shift versions of ZF6HP21/28/34 (Generation 2) valve bodies only. For E-shift versions, Sonnax offers 95740-72K.


You need this if... View Instructions

Flare upshifts or downshift bind-ups are common problems in vehicles equipped with ZF6HP21/28/34 (Generation 2) transmissions. These problems can be accompanied by a coastdown neutral condition or pressure control out-of-range codes. The clutch control valves control clutch apply and release timing, and problems occur when the clutch control valves wear. Sonnax offers the oversized clutch A and clutch E control valve kit 95740-66K (M-shift version) to restore shift timing and vehicle drivability.

  • Valves are hardcoat anodized to reduce wear
  • Sleeve is made from highly wear-resistant aluminum
  • O-ringed end plug for better sealing

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.

  • Clutch Control Valve
  • Boost Valve
  • Boost Sleeve
  • O-Ringed End Plug
  • O-Rings (2) 1 Extra

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 (Generation 2) Valve Body Layout

Zf6hp21 28 34 gen 2

January 14, 2014

ZF6HP19/26/32 (Generation 1), Ford 6R60, 6R75, 6R80, ZF6HP21/28/34 (Generation 2) Identification Guide

Topics: Identification Guides Transmission Ford ZF ZF6HP19 Transmission ZF6HP26 Transmission ZF6HP32 Transmission ZF6HP21 Transmission ZF6HP28 Transmission ZF6HP34 Transmission 6R80 Transmission 6R60 Transmission

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December 21, 2012

ZF6HP21/28/34 (Gen. 2) Vacuum Test Guide

Topics: Vacuum Testing Vacuum Test Guides Transmission ZF ZF6HP21 Transmission ZF6HP28 Transmission ZF6HP34 Transmission

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  • 95740 66k

You need this if...

Vacuum tests at the ports indicated fail to hold the recommended minimum in-Hg.

  • 95740 66k test