Symptoms:

  • 1-2 Flare
  • 2nd Slip
  • 5-6 Flare
  • 6th Slip
  • B1 band burned
  • Gear ratio & solenoid codes

Cause:

Wear at the B1 band control valve bore affects apply and release rate of the servo.

Correction:

Sonnax B1 band control valve kit corrects circuit pressure loss and restores control of brake apply and release.

TF-80SC, TF-81SC

B1 Band Control Valve Kit
Part No. 39741-22K

Also fits Volvo (AM6); Opel (AF40); Peugeot (TF80); Saab (AF40/6); Land Rover (TF80); Ford (AF21) & Mazda (AW6A-EL).


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

The B1 band in Aisin AW TF-80SC and TF-81SC transmissions is applied in 2nd and 6th Gears in conjunction with other clutch packs. As the B1 band control valve oscillates and strokes over time, bore deterioration results which prevents proper hydraulic control of the B1 band. This can cause flares, harsh shifts, slipping, erratic clutch apply timing, ratio codes and a burnt B1 band. Reconditioning the bore and installing Sonnax B1 band control valve kit 39741-22K restores normal shift operation and feel by re-establishing the hydraulic integrity of the B1 circuit.

  • Sonnax valve is hardcoat anodized aluminum to provide wear resistance
  • Annular grooves have been added to the valve for better centering in the bore
  • The highly wear-resistant Sonnax sleeve provides over 80% more support than the OE casting
  • A new spring is included to allow proper calibration
  • 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 B1 Band Control Valve Kit 39741-22K
  • TF-80SC, TF-81SC B1 Band Control Valve Kit 39741-22K
  • TF-80SC, TF-81SC B1 Band Control Valve Kit 39741-22K

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 B1 Band Control Valve Kit Vacuum Test Locations