- 5-4 Flare
- 5-4 Neutral
- Delayed Forward
- Harsh Forward
- No 4-5
- VFS 1/A solenoid control code
OE boost sleeve wears prematurely, allowing critical pressure loss and/or seizure of valve within sleeve.
Recover hydraulic control and renew shift performance by installing Sonnax clutch A & E control boost valve kit.
Clutch A & E Control Boost Valve Kit
- Valves (2)
- Sleeves (2)
Sevices 2 bores
ZF6HP21/28/34 (Generation 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
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.
You need this if...
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.
Click here to view PDF if instructions do not appear below.
Valve Body Layouts
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