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  • Erratic shift timing
  • Pressure control out-of-range codes
  • Slips & flares
  • C3 Clutch burned
  • Bind-up
  • Slipping gears


Oscillation of the C3 clutch control valve causes bore wear, allowing critical pressure escape and preventing proper actuation of C3 clutches.


Recover hydraulic control and renew shift performance by reconditioning bore and installing Sonnax oversized C3 clutch control valve kit.

TF-80SC, TF-81SC

Oversized C3 Clutch Control Valve Kit
Part No. 39741-50K

Also 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

C3 clutches in Aisin AW TF-80SC and TF-81SC transmissions are applied in 3rd, 5th and Reverse Gears in conjunction with other clutch packs. As the C3 clutch control valve oscillates and strokes over time, bore deterioration results, which prevents proper hydraulic control of the C3 clutch pack. This can cause flares, slipping, erratic clutch apply timing, ratio codes, bind-ups, and burnt C3 clutches. Reconditioning the bore and installing Sonnax oversized C3 clutch control valve kit 39741-50K restores normal shift operation and feel by re-establishing the hydraulic integrity of the C3 circuit.

  • Annular groove helps center valve in bore to reduce future side-load wear
  • New spring matches OE calibration
  • Hardcoat anodized aluminum valve combats premature wear
  • Valve
  • 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

Tf 80sc vbl thumb

Aisin AW TF-81SC Valve Body Layout

Tf 81sc vbl thumb

September 30, 2005

Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits

Gregg Nader

Topics: Diagnostics And Theory Transmission

Read Now
  • 39741 50k combo
  • 39741 50k

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum 18 in-Hg, or if wear is visually detected.

  • 39741 50k vacuum