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  • Low line rise
  • Soft shifts
  • Delayed Reverse


Severe wear of the boost sleeve due to continuous valve oscillation allows EPC and Reverse boost oil leakage.


Install Sonnax valve and sleeve to restore hydraulic integrity.

4R100, E4OD

Boost Valve Kit
Part No. 36424-03K

Factory Style, No O-Rings

You need this if... View Instructions

Vehicles with Ford E4OD and 4R100 transmissions frequently have problems with poor line rise and/or soft shifts. These complaints are often caused by severe wear of the pressure regulator boost sleeve, allowing EPC and Reverse boost oil leakage. Sonnax boost valve kit 36424-03K eliminates these problems.

  • Sleeve manufactured from highly wear-resistant aluminum alloy
  • Hardcoat anodized aluminum valve combats premature wear
  • Valve
  • Sleeve
  • 36424 03k combo
  • 36424 03k

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.

  • 36424 03k test