A & E cntl Valve kit OS 6HP21/28

This kit fits either clutch A or E control bore locations in E-shift versions of ZF6HP21/28/34 (Generation 2) valve bodies only. For M-shift versions use 95740-66K.

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 95740-72K (E-shift version) to restore shift timing and vehicle drivability.

Bypass Cl Cntrl V.kit OS, 6HP21/28/34

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.

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.

Shift valve 3 kit OS 6HP21/28

This kit fits M-shift versions of ZF6HP21/28/34 (Generation 2) valve bodies only.

Harsh reverse engagement, slippage in reverse or a burned D1 brake can indicate a worn shift valve 3 in vehicles equipped with ZF6HP21/28/34 (Gen. 2) units. In Reverse, the valve uses reverse pressure to regulate line pressure into the D1 brake control circuit. The valve moves under the combined influence of the spring and orificed reverse pressure inboard, which are opposed by reverse pressure outboard.

Wear at the inboard spool can reduce apply pressure, causing the D1 brake to slip and burn. Outboard wear lessens the valve's ability to regulate line pressure leading to a harsh D1 apply. Sonnax oversized shift valve 3 kit 95740-74K allows the worn bore to be refurbished, restoring proper hydraulic clearances and eliminating loss of valuable line, reverse and D1 brake control circuit fluid pressures.

O-Ringed End Plug Kit

Part No. 95740-81K

Fits ZF6HP19/26/32 (Gen. 1) units with 053 separator plate code only.

• Valves, springs and pressurized fluid repeatedly push on end plugs causing them to deform and wear.

• As a result, critical pressure is lost due to excessive clearance between the plug and bore.

Sonnax O-ringed end plug kit 95740-81K for ZF6HP19/26/32 (Gen. 1) units with a 053 separator plate code replaces the damaged OE end plugs, and restores pressure containment to the valve bore.

Prevents loss of critical pressure Single O-ring sealed end plugs replace all 11 of the 13mm and 17mm dia. end plugs

Clutch A & E Control Boost Valve Kit

Sevices 2 bores

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.

Contents

"Y" Shaped Valve Retainer

Part No. 95740-04K

Package Quantity: 10

For:

6R100, 6R60, 6R75, 6R80 (2009-2014), 6R80 (2015-Later), 845RE, 

ZF6HP19, ZF6HP21, ZF6HP26, ZF6HP28, ZF6HP32, ZF6HP34, ZF8HP45, ZF8HP50, ZF8HP55, ZF8HP70, ZF8HP75