ParkAvenue 1997-1999

Transaxle Removal & Installation

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Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

  1. Disconnect the negative terminal from the battery. Detach the wire connector at the Mass Air Flow sensor.
  2.  
  3. If equipped, remove the cross brace to strut towers, as follows:
    1. Loosen the bar assembly through-bolts.
    2.  
    3. Remove the inboard strut nuts.

      Click image to see an enlarged view

      Fig. The automatic transaxle fluid level sensor is mounted in the top of the transaxle case

    4.  
    5. Remove the brace assembly.
    6.  
    7. Reinstall the inboard strut nuts.

      Click image to see an enlarged view

      Fig. Exploded view of the strut tower cross brace

    8.  

  4.  
  5. Remove the air intake duct.
  6.  
  7. Disconnect the cruise control cable from the throttle body.
  8.  
  9. Remove the shift control linkage from the mounting bracket at the transaxle and the lever at the manual shaft.
  10.  
  11. Label and detach the connectors from the following:
    1. Park/neutral/backup lamp switch.
    2.  
    3. Transaxle electrical connector.
    4.  
    5. Vehicle speed sensor and fuel pipe retainers.
    6.  

  12.  
  13. Remove the fuel pipe retainers.
  14.  
  15. Disconnect the vacuum modulator hose from the modulator.
  16.  


WARNING
You must support or remove the engine. If the engine is not support you may damage the engine, transaxle, halfshafts or many other components.

  1. Remove the three top transaxle-to-engine block bolts and install a suitable engine support fixture. Load the support fixture by tightening the wingnuts several turns in order to relieve the tension on the frame and the mounts.
  2.  



Click image to see an enlarged view

Fig. You have to use a suitable holding fixture to support the engine. If necessary, one can usually be rented

  1. Turn the steering wheel to the full left position.
  2.  
  3. Raise and safely support the vehicle. Remove both front tire and wheel assemblies.
  4.  
  5. Drain the automatic transaxle fluid into a suitable container.
  6.  



Click image to see an enlarged view

Fig. Drain the automatic transaxle fluid into a suitable drain pan, but be careful, as this can be messy

  1. Remove the right and left front ball joint nuts, then separate both control arms from the steering knuckle.
  2.  
  3. Remove the right halfshaft from the transaxle only. Do not remove the halfshaft from the hub/bearing assembly.
  4.  

Carefully guide the output shaft past the lip seal. Do not allow the halfshaft splines to contact any portion of the lip seal.

  1. Remove the left halfshaft from the transaxle and hub/knuckle assembly. Be careful not to damage the pan.
  2.  
  3. Support the transaxle with a suitable stand.
  4.  
  5. Remove the bolts at the transaxle and the nuts at the cradle member. Remove the left front transaxle mount.
  6.  



Click image to see an enlarged view

Fig. Exploded view of the front transaxle mount

  1. Remove the right front mount-to-cradle nuts. Remove the left rear transaxle mount-to-transaxle bolts.
  2.  
  3. Remove the torque strut bracket from the transaxle.
  4.  



Click image to see an enlarged view

Fig. Torque strut assembly attachment

  1. Remove the right transaxle mount-to-transaxle bolts.
  2.  
  3. Remove the left rear transaxle mount. Remove the transaxle brace from the engine bracket.
  4.  



Click image to see an enlarged view

Fig. Exploded view of the transaxle rear mount



Click image to see an enlarged view

Fig. Transaxle brace-to-engine attachment

  1. Remove the stabilizer shaft link-to-control arm bolt.
  2.  

Be sure to matchmark the flywheel-to-converter relationship for proper alignment upon reassembly.

  1. Unfasten the flywheel cover bolts, then remove the cover. Matchmark the flywheel-to-torque converter installed position, then remove the flywheel-to-converter bolts.
  2.  



Click image to see an enlarged view

Fig. Exploded view of the torque converter/flywheel cover

  1. Remove the bolts attaching the rear frame member to the front frame.
  2.  
  3. Remove the front left cradle-to-body bolt and the front cradle dog leg-to-right cradle member bolts.
  4.  
  5. Remove the frame/cradle assembly by swinging it aside and supporting it with a jackstand.
  6.  



Click image to see an enlarged view

Fig. Frame separation points

  1. Disconnect the oil cooler lines from the transaxle, then plug the lines to avoid contamination.
  2.  



Click image to see an enlarged view

Fig. Typical oil cooler line attachment

One bolt located between the transaxle and the engine block is installed in the opposite direction.

  1. Remove the remaining lower transaxle-to-engine bolts and lower the transaxle from the vehicle. Be careful when removing the transaxle to avoid damaging the right-hand output shaft, shaft seal, hoses, lines and wiring.
  2.  



Click image to see an enlarged view

Fig. Transaxle-to-engine mounting. Notice that one bolt mounts in the opposite direction

To install:

  1. Install the transaxle into the vehicle using the dowel pin as guide. Tighten the bolts to the specifications shown in the chart at the end of this section.
  2.  
  3. The installation is the reverse of the removal procedure. Keep the following important points in mind when installing the transaxle:
  4.  

Be careful when installing the right side halfshaft into the transaxle case. The splined shaft can easily cause damage to the seal.

  1. Before installing the right side halfshaft, install a suitable axle seal protector.
  2.  
  3. Tighten the retainers to the specifications given in the chart at the end of this section.
  4.  
  5. Align the flywheel-to-torque converter marks made during removal. The torque converter-to-flywheel bolts should always be tightened twice.
  6.  
  7. Check adjustment of the shift cables, as outlined later in this section.
  8.  
  9. After installing the front wheels and tires, make sure to tighten the lug nuts to specification.
  10.  
  11. When installing the cross brace to the struts, perform the following:
  12.  

  1. Place the assembly on the inboard strut studs.
  2.  
  3. Install the strut stud nuts and tighten to 14 ft. lbs. (24 Nm).
  4.  
  5. Tighten the torque bar assembly through-bolts to 19 ft. lbs. (26 Nm).
    1. Check and adjust the fluid level as necessary, making sure to use the proper type of fluid.
    2.  
    3. When installing the transaxle-to-engine block brace, tighten the brace-to-engine bolts first and the brace-to-transaxle case last to avoid pulling the transaxle case out of line.
    4.  

  6.  
  7. After the installation is complete, road test the vehicle and check for proper operation and leaks.
  8.  

Specific to:

Buick Park Avenue 1998-1999

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Air cleaner cover
     
    Transaxle electrical connector
     
    Shift control cable bracket with cable attached
     
    Top transaxle case bolts
     
    Top bolt from rear transaxle mount
     
    Left side steering rack mount bolts
     
    Oxygen (O 2 S) sensor connector
     

  4.  
  5. Install an engine support fixture.

    Both front tires
     
    Both splash shields
     
    Power steering line bracket
     
    Both transaxle mounts
     
    Right steering rack mount bolts
     
    Transaxle cooler lines
     
    Sway bar mounts
     
    Lower ball joints
     
    Front subframe bolts and lower subframe
     
    Both drive axles
     
    Torque converter cover
     
    Flexplate bolts
     
    Input Speed (ISS) sensor connector
     
    Engine to transaxle bracket
     
    Transaxle fluid filler tube
     
    Rear engine mount
     
    Remaining transaxle to engine bolts
     
    Transaxle from vehicle
     

  6.  

To install

  1. Install or connect the following:
    NOTE
    Use care when installing the right side drive axle into the transaxle case. The splined shaft of the axle can easily damage the seal.



    Transaxle to vehicle
     
    Transaxle to engine bolts. Torque the bolts to 55 ft. lbs. (75 Nm).
     
    Rear engine mount
     
    Transaxle fluid filler tube. Torque the filler tube bolt to 15 ft. lbs. (20 Nm).
     
    Engine to transaxle bracket. Torque the bolts to 44 ft. lbs. (60 Nm).
     
    ISS electrical connectors
     
    Flexplate bolts. Torque the bolts to 46 ft. lbs. (62 Nm).
     
    Torque converter cover
     



    Left and right drive axles to transaxle
     
    Engine frame bolts. Torque the bolts to 83 ft. lbs. (112 Nm).
     
    Lower ball joints to steering knuckles. Torque the nuts to 88 in. lbs. (10 Nm).
     
    Sway bar mounts to the lower control arms
     
    Transaxle cooler lines to the frame
     
    Right steering rack mount bolts to engine frame. Torque the bolts to 45 ft. lbs. (65 Nm).
     
    Right and left transaxle mount to frame
     
    Power steering line bracket to frame
     
    Right and left splash shields
     
    Both front tires. Torque the wheel nuts to 100 ft. lbs. (140 Nm).
     
    O 2 S sensor electrical connector
     
    Left side steering rack mount bolts. Torque the bolts to 48 ft. lbs. (65 Nm).
     
    Top bolt of the rear transaxle mount. Torque the bolt to 42 ft. lbs. (58 Nm).
     
    Shift control cable and bracket
     
    Transaxle electrical connector
     
    Air cleaner cover
     
    Negative battery cable
     

  2.  
  3. Check and adjust transaxle fluid level.
  4.  
  5. Road test vehicle and check for transaxle leaks.
  6.  

 
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