Symptoms:

  • Low line rise
  • Low line rise in Reverse & shudder
  • 1-2 Quality poor
  • Delayed Reverse

Cause:

Worn boost valve sleeves allow EPC, TV boost or reverse pressures to cross leak into exhaust.

Correction:

These replacement boost valve kits are hardened and anodized to prevent wear and are tightly toleranced to restore the hydraulic integrity of the circuits.

Warning:

The applications listed above are meant as a guide only. Be sure to measure original valve and compare dimensions before purchasing.

F4A-EL, F4EAT, GF4A-EL

Boost Valve Kit
Part No. 74846-01K

No TV cable, electronic transmissions, Factory style sleeve, no o-rings

View Instructions Find a Distributor

Vehicles with a G4A-EL or GF4A-EL, F4A-EL, or F4EAT transmission may have problems with low line rise or low reverse boost. These problems can be caused by worn boost valve sleeves that allow EPC (GF4A-EL F4A-EL, F4EAT), TV boost (G4A-EL F4A-EL, F4EAT), or reverse pressures to cross leak or leak to exhaust. Sonnax has developed replacement boost valve kits for both the G4A-EL, [71846-01K] and the GF4A-EL, F4A-EL, and F4EAT 74846-01K.

  • The GF4A-EL boost valve is made from anodized aluminum, and the sleeve is manufactured from high-quality aluminum to resist wear.
  • The 74846-01K GF4A-EL kit has been modified to fit the F4A-EL and F4EAT applications, and allows for more responsive EPC pressure.

No TV Cable/with Electronic Transmission

  • Valve
  • Sleeve
  • F4A-EL, F4EAT, GF4A-EL Boost Valve Kit 74846-01K
  • F4A-EL, F4EAT, GF4A-EL Boost Valve Kit 74846-01K