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Symptoms:

  • Low solenoid feed pressure
  • Shift concerns
  • Shift codes

Cause:

Wear at the cast aluminum accumulator bores by the steel pistons allows apply oil to exhaust.

Correction:

The drop-in replacement anodized aluminum Sonnax accumulator pistons incorporate an O-ring for positive sealing and annular grooves for better centering and wear prevention.

TF-81SC

Solenoid Modulator Accumulator Piston Kit
Part No. 39741-14K

You need this if... View Instructions

Wear at the solenoid modulator accumulator bores on this TF-81 unit is very common. Wear allows solenoid feed pressure to exhaust resulting in various shift complaints and/or codes. The Sonnax accumulator piston incorporates an O-ring for positive sealing and annular grooves for better centering and wear prevention.

  • Drop-in replacement pistons no special tools required.
  • Pistons incorporate an o-ring for positive sealing, even on worn bores.
  • Annular grooves added for better piston centering and wear prevention.
  • Anodized aluminum piston prevents wear and eliminates thermal expansion related leakage.

Two Locations. Fits Ford (AF21) and Mazda(AW6A-EL)

  • Piston
  • O-Ring

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-81SC Valve Body Layout

Tf 81sc vbl thumb
  • 39741 14k combo
  • 39741 14k

You need this if...

Visual inspection of the bore often shows shiny patches of wear. If wear is visible, perform at Wet Air Test or Vacuum Test at the apply port. Vacuum Test must hold a minumum of 18".

  • 39741 14k test