Symptoms:

  • Soft slide shifts
  • Delayed Reverse
  • Low line rise
  • Direct clutch failure

Cause:

Severe wear of the pressure regulator boost sleeve allows boost oil leakage.

Correction:

This pressure regulator boost valve and O-ringed sleeve kit is made from high quality aluminum to reduce wear. Added O-rings prevent oil from escaping past the valve body bore.

AOD

Boost Valve Kit
Part No. 76990K

O-Ring style

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Vehicles with an AOD transmission frequently have problems with poor line rise, which results indirect clutch failures and soft shift slides. These complaints are often caused by severe wear of the pressure regulator boost sleeve, allowing oil leakage. The hardened steel boost valve continuously reciprocates within the aluminum boost sleeve, and wears the inside diameter of the sleeve. This excessive leakage can be eliminated by installing the Sonnax pressure regulator boost valve and o-ringed sleeve kit 76990K.

  • Replacement boost sleeve is manufactured out of a special aluminum designed to prevent wear.
  • O-rings added to the outside diameter of the sleeve prevent feed oil from escaping past the valve body bore.
  • Steel valve has been tightly toleranced to allow minimum clearance with the inside diameter of the sleeve.
  • Sleeve and valve restore the hydraulic integrity of the assembly.
Boost Valve Ratios
Part Numbers Ratios Great for these Applications
76990K & 76990-03K .545" Spool Standard Ratio Standard OE
76990-04K .553" Spool Large Ratio Large Ratio OE & High Performance

O-ring seals are added insurance against boost oil loss. Sleeve can be installed without these seals, but their use is recommended

  • Valve
  • Sleeve
  • O-Rings (3)
  • AOD Boost Valve Kit 76990K
  • AOD Boost Valve Kit 76990K