Symptoms:

  • Shift concerns
  • A Clutch burned
  • B Clutch burned
  • E Clutch burned

Cause:

Bore wear caused by valve oscillation causes loss of solenoid command pressure and/or line pressure which can cause low apply fluid pressure at the A, B and E driving clutches.

Correction:

The oversized Sonnax position valve allows the bore to be refurbished to restore proper hydraulic clearances, eliminating loss of needed fluid pressure.

ZF6HP19, ZF6HP21, ZF6HP26, ZF6HP28, ZF6HP32, ZF6HP34

Oversized Position Valve Kit
Part No. 95740-75K

This kit fits E-shift versions only of the ZF6HP21/28/34 (Generation 2) and ZF6HP19/26/32 (Generation 1) valve bodies with an 053 separator plate.


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

In the noted units, the position valve, a two-valve train controlled by the MV2 solenoid, directs line pressure to the driving clutches (A, B, E) through their related clutch regulator valves. Wear of either valve’s spools or in the bore (depending on the wear location) can result in loss of command fluid pressure from the MV2 solenoid or reduced line pressure to the clutch regulator valves. In either case, the result is loss of apply fluid pressure to the driving clutches. Initial signs of this problem are shift issues leading to slipping in gear as the clutches burn and eventually disintegrate. Sonnax oversized position valve 95740-75K allows the worn bore to be refurbished, restoring proper hydraulic clearances and eliminating loss of necessary MV2 command fluid at the position valve or line pressure to the clutches.

  • Added annular grooves increase bore and valve spool lubrication
  • Valve is hardcoat anodized to reduce wear
  • O-Ringed end plug reduces or eliminates end plug leakage

This kit fits E-shift versions only of the ZF6HP21/28/34 (Generation 2) and ZF6HP19/26/32 (Generation 1) valve bodies with an 053 separator plate. To differentiate between Gen. 1 and Gen. 2 valve bodies, see ZF Identification Guide.

  • Spring
  • Valve Long Stem
  • Valve No Stem
  • 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 (Gen. 2) Valve Body Layout

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

ZF6HP19/26/32 (Gen. 1) with 053 Separator Plate Valve Body Layout

ZF6HP19/26/32 (Gen. 1) with 053 Separator Plate Valve Body Layout
  • ZF6HP19, ZF6HP21, ZF6HP26, ZF6HP28, ZF6HP32, ZF6HP34 Oversized Position Valve Kit 95740-75K

You need this if...

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

ZF6HP19, ZF6HP21, ZF6HP26, ZF6HP28, ZF6HP32, ZF6HP34 Oversized Position Valve Kit Vacuum Test Locations
ZF6HP19, ZF6HP21, ZF6HP26, ZF6HP28, ZF6HP32, ZF6HP34 Oversized Position Valve Kit Vacuum Test Locations