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Home › Cadillac › 2003 › DeVille Base › Repair and Diagnosis › Transmission › Automatic Trans › Automatic Transaxle - 4T80-E › Repair Instructions › Case Extension Replacement › Installation Procedure

Installation Procedure

  1. Inspect the scavenge tube (54) for damage and clogging.
    Fig 1: Inspecting Scavenge Tube (54) For Damage & Clogging
    G02098991Courtesy of GENERAL MOTORS CORP.
  2. Install the scavenge tube seal into the case.
  3. Install the scavenge tube into the scavenge tube seals located in the case and in the driven sprocket support. Tap the scavenge tube lightly with a plastic hammer to ensure a tight fit in both seals.
    NOTE: Refer to FASTENER NOTICE
  4. Install the scavenge tube bolt.

    Tighten 

    Tighten the bolt to 8-14 N.m (6-10 lb ft).

    Fig 2: Installing Scavenge Tube Seal Into Case
    G02098992Courtesy of GENERAL MOTORS CORP.
  5. Inspect the case to case extension seal (126).
  6. Inspect the case extension mating surface for damage.
    Fig 3: Inspecting Case To Case Extension Seal (126)
    G02098993Courtesy of GENERAL MOTORS CORP.
  7. Install the following parts:
    • The selective washer (133)
    • The thrust washer (132)
    • The case extension seal (126)
    • The case extension (134)
      Fig 4: Installing Components
      G02098994Courtesy of GENERAL MOTORS CORP.
  8. Apply pipe thread sealant GM P/N 12346004 to bolt threads before installation. Install the case extension bolts (128, 129).
  9. Hand tighten the bolts (128, 129) until the case extension is seated onto the case.
    Fig 5: Identifying Case Extension Bolts (128, 129)
    G02098995Courtesy of GENERAL MOTORS CORP.
  10. Install the long J 25025-7A  and the J 8001  .
  11. Position the dial indicator with the stem contacting the output shaft (112). Set the dial indicator to zero.
  12. Insert the J 28585  through the vehicle speed sensor bore and lift the speed sensor rotor for measurement. Protect the bore with a piece of wood or a suitable piece of plastic.
  13. Proper end play clearance is 0.15-0.65 mm (0.006-0.026 in).
  14. Record the measured specification and, if necessary, adjust the clearance with the proper thickness selective thrust washer and reassemble. Refer to step 3.
  15. Remove the dial indicator set and the post.
    Fig 6: Positioning Dial Indicator With Stem Contacting Output Shaft (112)
    G02098996Courtesy of GENERAL MOTORS CORP.
  16. Install the stud (127).

    Tighten 

    • Tighten the bolt (128) and the stud (127) to 50-55 N.m (37-40 lb ft).
    • Tighten the bolt (129) to 20-27 N.m (15-20 lb ft).
  17. Install the transmission brace. Refer to ENGINE TO TRANSAXLE BRACE REPLACEMENT  .
  18. Install the vehicle speed sensor. Refer to VEHICLE SPEED SENSOR (VSS) REPLACEMENT  .
  19. Install the ground wire to case.
  20. Install the wiring harness.
  21. Install the right drive axle. Refer to AXLE SHAFTS
    Fig 7: Installing Stud (127)
    G02098997Courtesy of GENERAL MOTORS CORP.
  22. Remove the safety stands.
  23. Lower the vehicle.
  24. Fill the transmission with fluid. Refer to FLUID CAPACITY SPECIFICATIONS  .
  25. Check the fluid level. Refer to TRANSMISSION FLUID CHECKING PROCEDURE  .
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