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