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Automatic Transmission - Overhaul - 4L80-E: Maintenance GMC Pickup C2500

Automatic Trans

LUBRICATION

See appropriate TRANSMISSION SERVICING article.

OIL COOLER FLUSHING

  1. If available, fill line flusher with solution and install Oil Cooler and Line Flusher (J-35944) to top transaxle cooler line on transaxle. Follow manufacturer's instructions to flush oil cooler and cooler lines.
  2. If flusher tool is not available, flush cooler and cooler lines with a mixture of clean solvent and water. Flush cooler in both directions until all old fluid and debris are removed. If necessary, replace plugged or damaged cooler and/or lines.

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