Symptoms:

  • Coastdown Neutral
  • Delayed Forward
  • Gear ratio & solenoid codes
  • K1 Clutch burned
  • C1 Clutch burned
  • Erratic shift timing
  • Flare shifts
  • Harsh shifts

Cause:

Wear in C1/K1 clutch control bore allows circuit pressure loss, preventing proper hydraulic actuation of C1/K1 clutches.

Correction:

Ream the valve bore and install the Sonnax improved valve and sleeve assembly and calibrated spring.

09G, 09K, 09M, 6F21WA, TF-60SN, TF-80SC, TF-81SC

C1/K1 Clutch Control Valve Kit
Part No. 15741-25K

Fits C1 clutch control bore for TF-80SC & TF-81SC. Fits K1 clutch control bore for for TF-60SN, 09G, 09K, 09M and Mini 6F21WA. Also fits Volvo (AM6), Opel (AF40), Saab (AF40/6), Ford (AF21) and Mazda (AW6A-EL).


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

C1/K1 clutches in listed units are applied in 1st through 4th Gears in conjunction with other clutch packs. As the C1/K1 clutch control valve oscillates and strokes over time, bore deterioration results, which prevents proper hydraulic control of the clutch pack. This can cause flares, slipping, erratic clutch apply timing, ratio codes, and burnt C1/K1 clutches. Reconditioning the bore and installing Sonnax C1/K1 clutch control valve kit 15741-25K restores normal shift operation by re-establishing the hydraulic integrity of the C1/K1 circuit.

  • Highly wear-resistant sleeve provides additional support to the control valve
  • Hardcoat anodized aluminum valve is wear-resistant, and has more sealing contact with bore than OE to minimize leakage
  • Selectable spring to match OE calibration
  • Valve
  • Sleeve
  • Springs (2) Selectable

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.

Aisin AW TF-80SC Valve Body Layout

Aisin AW TF-80SC Valve Body Layout

Aisin AW TF-81SC Valve Body Layout

Aisin AW TF-81SC Valve Body Layout

Aisin AW TF-60SN Valve Body Layout

Aisin AW TF-60SN Valve Body Layout
  • 09G, 09K, 09M, 6F21WA, TF-60SN, TF-80SC, TF-81SC C1/K1 Clutch Control Valve Kit 15741-25K
  • 09G, 09K, 09M, 6F21WA, TF-60SN, TF-80SC, TF-81SC C1/K1 Clutch Control Valve Kit 15741-25K
  • 09G, 09K, 09M, 6F21WA, TF-60SN, TF-80SC, TF-81SC C1/K1 Clutch Control Valve Kit 15741-25K
  • 09G, 09K, 09M, 6F21WA, TF-60SN, TF-80SC, TF-81SC C1/K1 Clutch Control Valve Kit 15741-25K

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.

09G, 09K, 09M, 6F21WA, TF-60SN, TF-80SC, TF-81SC C1/K1 Clutch Control Valve Kit Vacuum Test Locations