GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2000 🢒 DeVille 🢒 Transmission/Transaxle 🢒 Automatic Transaxle - 4T80-E 🢒 Final Drive Assembly Replacement

Removal Procedure
  1. Remove the case extension. Refer to Case Extension Replacement .

    2. Object Number: 627402 Size: SH
  2. Remove the heat shield

    3. Object Number: 627408 Size: SH
  3. Remove the right transmission to engine bracket.

    4. Object Number: 11835 Size: SH
  4. Remove the vehicle speed sensor (VSS) (130) electrical connector.

    5. Object Number: 11839 Size: SH
  5. Remove the case extension bolts (127, 128, 129).
  6. Remove the seal (126).
  7. Remove the roller thrust bearing (132) and the selective washer (133).

    8. Object Number: 11840 Size: SH
  8. Remove the scavenge tube bolt (15).
  9. Remove the scavenge tube (54) by prying on the differential.
  10. Remove the scavenge tube seal (53).

    11. Object Number: 11841 Size: SH
  11. Rotate the manual shaft (16) counter-clockwise in order to place the transmission in Park (P) and prevent the differential from rotating.

    12. Object Number: 11842 Size: SH
  12. Remove the four bolts (119) from the differential housing to transmission case.
  13. Remove the differential carrier.

    14. Object Number: 11843 Size: SH
  14. Push on the output shaft in order to expose the left side differential gear snap ring. Remove the left side differential gear to output shaft snap ring (56).
  15. Remove the differential side gear (118) and thrust washer (117).

    16. Object Number: 11845 Size: SH
  16. Remove the final drive carrier (100) and the thrust bearing.
  17. Remove the final drive sun gear (121).

Installation Procedure

    Object Number: 11845 Size: SH
  1. Install the sun gear with the bushing and the seal side facing differential.
  2. Install the final drive carrier. Turn the unit until it meshes with the sun gear and the internal gear teeth.

    3. Object Number: 11843 Size: SH
  3. Install the left thrush washer.
  4. Install the left deferential side gear.
  5. Install the snap ring.

    6. Object Number: 11842 Size: SH
  6. Use the manual shaft to place the transaxle in park.

    7. This will lock up the final drive unit. The actuator rod will move up.

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  7. Install the differential housing and the four bolts (119). Hand tighten, using a star pattern.

    8. Tighten
    Tighten the bolts to 76 N·m (56 lb ft).


    Object Number: 97498 Size: SH
  8. Install the scavenger tube seal into the case.
  9. Tap the scavenger tube in lightly using a plastic hammer. The rib on the pipe will remain exposed. This is a normal condition.
  10. Install the scavenger tube bolt.

    11. Tighten
    Tighten the bolt to 13 N·m (116 Ib. in).


    Object Number: 11839 Size: SH
  11. Install the selective washer (133) and the thrust roller bearing (132) onto the differential output shaft.
  12. Insert the case extension seal (126) into the case extension.
  13. Install the case extension (134) onto the case.
  14. Install the bolts (128 and 129) and the stud (127). Install the stud in the 11 o'clock position using the star pattern.

    15. Tighten
    Tighten the bolts and the stud to 54 N·m (40 Ib. ft).

  15. Check the final drive end play. Refer to Case Extension Install/Final Drive End Play Check in Transmission Unit Repair Manual.
  16. Install the vehicle speed sensor (VSS) electrical connector and the ground wire to the case. Refer to Vehicle Speed Sensor Replacement .

    17. Object Number: 627408 Size: SH
  17. Install the right transmission to engine bracket.

    18. Object Number: 627402 Size: SH
  18. Install the heat shield.
  19. Install the right drive axle into the transmission. Refer to Wheel Drive Shaft Replacement

    20. in Driveline/Axle-Front Wheel Drive Shafts.

  20. Check the Fluid level. Refer to Fluid Capacity Specifications .