Symptoms:

  • 3-4 Flare
  • 4-5-6 Slip
  • Erratic shift timing
  • C2 Clutch burned

Cause:

The C2 clutch control valve provides source pressure for control of clutch (band) apply and release. Responding to TCU and the linear solenoid, the C2 control valve will establish control timing of apply and release relative to engine torque. Bore wear will cause an overlap or premature exhaust of clutch pressure.

Correction:

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

TF-80SC, TF-81SC

C2 Clutch Control Valve Kit
Part No. 39741-05K

Fits Volvo (AM6), Opel (AF40); Peugeot (TF-80), Saab (AF40/6), Land Rover (TF-80), Ford (AF21) and Mazda (AW6A-EL).


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

C2 clutches in Aisin AW TF-80SC and TF-81SC transmissions are applied in 4th, 5th and 6th Gears in conjunction with other clutch packs. As the C2 clutch control valve oscillates and strokes over time, bore deterioration results, which prevents proper hydraulic control of the C2 clutch pack. This can cause flares, slipping, erratic clutch apply timing, ratio codes, and burnt C2 clutches. Reconditioning the bore and installing Sonnax C2 clutch control valve kit 39741-05K restores normal shift operation by re-establishing the hydraulic integrity of the C2 circuit.

  • Highly wear-resistant sleeve provides additional support to the control valve
  • Hardcoat anodized aluminum valve combats premature wear and has more sealing contact with bore than OE to minimize leakage
  • New spring maintains OE operating pressures
  • Valve
  • Sleeve
  • Spring

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
  • TF-80SC, TF-81SC C2 Clutch Control Valve Kit 39741-05K
  • TF-80SC, TF-81SC C2 Clutch Control Valve Kit 39741-05K
  • TF-80SC, TF-81SC C2 Clutch Control Valve Kit 39741-05K

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.

TF-80SC, TF-81SC C2 Clutch Control Valve Kit Vacuum Test Locations