GM Service Manual Online
For 1990-2009 cars only

Caution: The antifreeze or water will deteriorate the seals, gaskets and the glue that bonds the clutch material to the pressure plate. Both conditions may cause damage to the transmission.

If antifreeze or water has entered the transmission, perform the following:

  1. Disassemble the transmission.
  2. Replace all of the rubber type seals. The coolant attacks the seal material which causes leakage.
  3. Replace the composition-faced clutch plate assemblies. The facing material may separate from the steel center portion.
  4. Replace all of the nylon parts - washers.
  5. Replace the torque converter.
  6. Thoroughly clean and rebuild the transmission, using new gaskets and oil filter.
  7. Flush the cooler lines after the transmission cooler has been properly repaired or replaced.