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Symptoms:

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

Cause:

The OE boost valve and sleeve seizes or becomes damaged. The OE boost sleeve is made of plastic, which can easily be cracked or broken when the sleeve is being removed from the valve body

Correction:

The Sonnax replacement boost sleeve is made of wear resistant aluminum to increase durability. The boost valve is designed to maintain OE pressures when used with the OE clutch A control valve.

6R60, 6R75, 6R80, ZF6HP19, ZF6HP26, ZF6HP32

Clutch A Control Boost Valve Kit
Part No. 95740-21K

You need this if... View Instructions

ZF6HP19/26/32 (Gen. 1) and Ford 6R60, 6R80 transmissions are equipped with a plastic sleeve for the clutch A control boost valve. This material is prone to damage, especially during removal. Failure of this sleeve results in delayed or harsh forward engagement, flare 5-4 downshifts and no 4-5 upshift. The Sonnax clutch A control boost valve and sleeve kit 95740-21K will restore the 4-5 downshift function, correct the missing 4-5 upshift as well as correct forward engagement problems. The Sonnax boost valve and sleeve kit can also be used to replace an OE boost assembly that was damaged during disassembly and must be used with the OE clutch A control valve.

  • Hard-coat anodized aluminum boost valve resists wear
  • Aluminum boost sleeve is highly wear resistant to increase life
  • Direct replacement boost assembly works in the OE bore, with the OE clutch control valve, to maintain OE system pressures
  • No special tools required

Kit is NOT compatible with ZF6HP21/28/34 (Gen.2) units. To differentiate between Gen. 1 and Gen. 2 valve bodies, see ZF Identification Guide.

  • Valve
  • Sleeve

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.

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

Zf6hp 053 vbl thumb

ZF6HP19, ZF6HP26, ZF6HP32 (Generation 1) Valve Body Layout

Zf6hp19 vbl thumb

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  • 95740 21k

You need this if...

A vacuum test at the outer port fails to hold 16 in-hg of vacuum, but the inner port does hold 18 in-hg. If the inner port does not hold 18 in-hg vacuum, you must use the oversized clutch A control valve kit [95740-09K] to repair the valve body.

  • 95740 21k test