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  • Oil leaks
  • Erratic shift timing


Leaking valve end plugs in pre mid-'83 units, or worn 3-4 shift valve and sleeve in mid-'83 and later units.


Replace worn, leaking valve end plugs with Sonnax O-ringed end plugs. Manufactured from high-quality aluminum, these end plugs are to resistant to wear. In addition, the O-ring on the outside diameter prevents leakage between the plug and the valve body.


Governor Circuit End Plug Kit
Part No. 76999-04K

Fits mid '83-earlier units.

View Instructions

Vehicles with an AOD transmission often have shift timing complaints due to governor or accumulator oil circuit leakage caused by leaking valve end plugs in the valve body. Most AOD valve assemblies are designed with an end plug to help retain the lineup and seal the circuitry. As these end plugs wear, circuit oil is lost and affects shift timing. Installing Sonnax governor circuit end plug kit 76999-04K can eliminate this excessive leakage.

Replacement plugs are included for the following valve applications: 1-2 accumulator, 1-2 shift, 2-3 shift, 1-2 capacity modulator, orifice control, OD servo regulator, 3-4 shift (plug or sleeve), and either the 3-4 shuttle or 2-3 backout.

  • Plugs have been manufactured from high-quality aluminum designed to resist wear.
  • O-Ring on the outside diameter prevents leakage between the plug and the valve body.
  • Plugs have a standard 8-32 UNC threaded hole for assistance in installation and removal.
  • O-Ringed plugs are more durable than knurling the OD of the original plug
  • End Plugs, Medium (3)
  • End Plug, Small
  • O-Rings, Small (8) 4 extra

September 30, 2005

Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits

Gregg Nader

Topics: Diagnostics And Theory Transmission

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  • 76999 04k combo
  • 76999 04k