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Removal (4L80-E)

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  1. Disconnect the battery negative (-) cable assembly from the battery negative terminal.
  2. Raise the vehicle.
  3. Support the vehicle with safety stands.
  4. If equipped with All Wheel Drive (AWD), remove the transfer case. See appropriate REMOVAL & INSTALLATION article in TRANSFER CASES.
  5. Disconnect the range selector cable from the transmission bracket and from the range selector lever. See Figure .
  6. Remove the rear drive shaft. See appropriate DRIVE SHAFTS & UNIVERSAL JOINTS article in DRIVELINE/AXLES.
  7. Support the transmission with a transmission jack.
  8. Remove the transmission support.
  9. Remove the exhaust pipe from the exhaust manifolds and the muffler assembly from the exhaust pipe.
  10. Remove the starter motor. See appropriate STARTERS article in ELECTRICAL.
  11. Mark the flywheel and the torque converter alignment.
  12. Remove the bolts that attach the torque converter-to-engine flywheel. See Fig 1 .
    Fig 1: Removing/Installing Torque Converter-To-Engine Flywheel Bolts (4L80-E)
    G00207876Courtesy of GENERAL MOTORS CORP.
  13. Remove the transmission vent hose and the wiring harness from the transmission.
  14. Remove the transmission fluid fill tube and the fill tube seal from the transmission. See FILLER TUBE under REMOVAL & INSTALLATION in appropriate SERVICING article.
  15. Plug the fluid fill tube opening in the transmission.
  16. Disconnect the transmission oil cooler pipes from the transmission.
  17. Plug the transmission oil cooler pipe connectors in the transmission case.
  18. Disconnect the wiring harness connectors from the transmission VSS and the PNP switch.
  19. Remove all vehicle harness wires, harness clips, tubes, brackets, and lines that may interfere with the removal of the transmission from the vehicle. See Figure .
  20. Remove the studs and the bolts securing the transmission to the engine. See Fig 2 .
    Fig 2: Removing/Installing Transmission-To-Engine Studs & Bolts (4L80-E)
    G00207878Courtesy of GENERAL MOTORS CORP.
  21. Pull the transmission straight back.
  22. Remove the transmission from the vehicle.
  23. Inspect all the components for wear and damage.
  24. Inspect all the seals and the fittings for signs of wear.
  25. Inspect the torque converter for stripped or broken weld nuts.
  26. Inspect the transmission case for cracks.
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