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Case Porosity Repair

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Some external leaks are caused by case porosity in non-pressurized areas. You can usually repair these leaks with the transmission in the car.

  1. Thoroughly clean the area to be repaired with a cleaning solvent. Air dry the area.
    CAUTION: Epoxy adhesive may cause skin irritations and eye damage. Read and follow all information on the container label as provided by the manufacturer.
  2. Using instructions from the manufacturer, mix a sufficient amount of an epoxy to make the repair.
  3. While the transmission case is still hot, apply the epoxy. You can use a clean, dry soldering acid brush to clean the area and also to apply the epoxy cement. Make certain that the area to be repaired is fully covered.
  4. Allow the epoxy cement to cure for three hours before starting the engine.
  5. Repeat the fluid leak diagnosis procedures.
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