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  • Excess release pressure
  • Cycling TCC RPM
  • Excess TCC slip
  • TCC apply & release concerns


Wear at the damper clutch control valve bore allows solenoid modulator pressure leakage, preventing the valve from staying in the applied position.


The Sonnax replacement damper clutch control valve and sleeve provides slightly longer spool engagement at the critical locations, is oversized to restore hydraulic sealing in a refurbished bore, and includes annular grooves to help prevent future wear.


Required tool kit F-84741-TL13 is no longer in production. Check with your distributor for availability.

A4CF1, A4CF2

Oversized Damper Clutch Control Valve Kit
Part No. 84741-13K

You need this if... View Instructions

The damper clutch control valve in Hyundai/Kia A4CF1, A4CF2 transmissions controls fluid pressure to the apply and release side of the converter clutch as well as to the cooler and lube circuits based upon the valve position. Solenoid modulator pressure works on the outboard valve spool diameter to stroke the valve into the converter apply position, and PCS signal pressure, combined with spring force at the inboard valve spool, work to stroke the valve into the converter release position. Wear at either of these critical valve-to-bore (casting or sleeve) locations will prevent proper functioning of the converter. The Sonnax oversized damper clutch control valve kit 84741-13K will restore the proper hydraulic clearance necessary to allow these pressures to work appropriately when used in a reamed bore.

  • Valve is paired with a modified sleeve, incorporating an O-ring which provides positive sealing of solenoid modulator feed pressure
  • Valve has lengthened spools for stability and sealing engagement in bores
  • Annular grooves have been added to hydraulically center the valve in the bore, preventing future wear.
  • Valve
  • Sleeve
  • 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.

Hyundai/Kia A4CF1, A4CF2 Valve Body Layout

Hyundkia a4cf1 vbl
  • 84741 13k combo
  • 84741 13k

You need this if...

A vacuum test at the ports indicated fail to hold at least 18 in-Hg

  • 84741 13k in test