• Low line rise in Reverse
  • Low line rise
  • No line rise
  • 1-2 Flare
  • 2-3 Flare
  • Delayed Reverse


A worn boost valve sleeve allows TV boost and reverse pressures to cross leak or leak to exhaust.


This boost valve and sleeve kit restores the hydraulic integrity of the circuits with tight tolerances.


Boost Valve Kit
Part No. 86940-05K

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In vehicles with ATX transmissions reduced/no line rise, delayed reverse and flare 1-2, 2-3 upshift complaints can be caused by a worn boost sleeve. Wear at this sleeve allows leakage between the TV boost and reverse circuits. The Sonnax boost sleeve and valve kit 86940-05K eliminates this cross leakage and restores the hydraulic integrity of the circuit.

  • Sleeve is manufactured from highly wear-resistant aluminum to prevent wear.
  • Kit can be used to replace any of the OE boost ratio size variations.
  • Valve
  • Sleeve
  • ATX Boost Valve Kit 86940-05K
  • ATX Boost Valve Kit 86940-05K