GM Lumina/Silhouette/Transport APVs 1990-1999 Repair Guide

Automatic Transaxle Assembly

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Removal & Installation




CAUTION
Some models covered by this guide may be equipped with a Supplemental Restraint System (SRS), which uses an air bag. Whenever working near any of the SRS components, such as the impact sensors, the air bag module, steering column and instrument panel, disable the SRS, as described in Chassis Electrical .

If your vehicle is equipped with air conditioning, refer to General Information and Maintenance for information regarding the implications of servicing your A/C system yourself. Only an MVAC-trained, EPA-certified, automotive technician should service the A/C system or its components.

The automatic transaxle in these vehicles can only be removed by removing the engine and transaxle/sub-frame as an assembly.

  1. Disconnect the negative battery cable.
  2.  
  3. Drain and recycle the engine coolant. Disconnect the airflow tube from the air cleaner.
  4.  
  5. Unplug the electrical connector from the PCM and push it through to the engine compartment. Disconnect the harness from the clips on the body and lay it across the engine.
  6.  

On later model vehicles, the PCM is located in the air filter housing. Disconnect the wiring harness connectors from the transaxle.

  1. Disconnect the engine harness at the bulkhead connector. Disconnect the throttle and TV cables.
  2.  


CAUTION
Observe all applicable safety precautions when working around fuel. Whenever servicing the fuel system, always work in a well ventilated area. Do not allow fuel spray or vapors to be exposed to a spark or open flame. Keep a dry chemical fire extinguisher near the work area. Always keep fuel in a container specifically designed for fuel storage; also, always properly seal fuel containers to avoid the possibility of fire or explosion.

  1. Disconnect the fuel lines. Disconnect the transaxle shift linkage.
  2.  


CAUTION
Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. In addition, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

  1. Disconnect the cooler lines at the radiator. Disconnect the radiator and heater hoses.
  2.  
  3. Remove the air conditioning compressor from the bracket and support it out of the way. Remove the upper engine support strut.
  4.  
  5. Raise and safely support the vehicle. Remove the front wheel and tire assemblies.
  6.  
  7. Remove the stabilizer bar. Disconnect the tie rod ends. Separate the lower control arm ball joints.
  8.  
  9. Disconnect the halfshafts and support them out of the way. Disconnect the steering shaft pinch bolt.
  10.  
  11. Remove the starter.
  12.  
  13. Disconnect the exhaust pipe at the manifold. Support the engine and sub-frame with a suitable jack.
  14.  

See Figure 1

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Fig. Fig. 1: Diagram of a properly installed engine support fixture

  1. Remove the sub-frame bolts and lower the engine/transaxle and subframe from the vehicle.
  2.  

See Figures 2 and 3

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Fig. Fig. 2: Typical transaxle mounts



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Fig. Fig. 3: Exploded view of the transaxle-to-engine brace

To install:
  1. Raise the engine assembly into position and install the subframe bolts. Tighten the bolts to 35 ft. lbs. (47 Nm).
  2.  
  3. Connect the exhaust pipe at the rear manifold. Install the starter.
  4.  
  5. Connect the steering shaft and install the pinch bolt. Connect the halfshafts to the transaxle.
  6.  
  7. Connect the lower control arm ball joints to the steering knuckles.
  8.  
  9. Install the stabilizer bar. Install the upper engine strut.
  10.  
  11. Install the wheel and tire assemblies. Lower the vehicle. Install the radiator and heater hoses.
  12.  
  13. Install the shift linkage. Connect the fuel lines and the throttle and TV cables.
  14.  
  15. Attach the harness to bulkhead connector. Connect the PCM harness to the PCM.
  16.  
  17. Connect the air cleaner hose and the radiator upper support.
  18.  
  19. Fill the cooling system. Install the air conditioning compressor.
  20.  
  21. Connect the negative battery cable.
  22.  

ADJUSTMENTS



Throttle Linkage
TV CABLE
  1. As required, remove the air cleaner assembly.
  2.  
  3. Depress and hold down the metal readjust tab at the engine end of the throttle valve cable.
  4.  
  5. Move the slider until it stops against the fitting. Release the readjustment tab.
  6.  
  7. Rotate the throttle lever to its full travel position. The slider must move toward the lever when the lever is rotated to its full travel position.
  8.  

See Figures 4, 5 and 6

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Fig. Fig. 4: TV cable system components



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Fig. Fig. 5: TV lever and bracket assembly



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Fig. Fig. 6: TV cable adjustment

  1. Check for proper operation. When the engine is cold, the cable may appear to be functioning properly, check the cable when the engine is hot.
  2.  
  3. Road test the vehicle.
  4.  

SHIFT CONTROL CABLE
  1. Place the shift lever in NEUTRAL. Neutral can be found by rotating the selector shaft clockwise from PARK through REVERSE to NEUTRAL.
  2.  

See Figures 7, 8, 9 and 10

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Fig. Fig. 7: Shift cable adjustment procedure diagram



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Fig. Fig. 8: Shift control cable showing the transaxle range switch.



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Fig. Fig. 9: Transaxle range switch mounting



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Fig. Fig. 10: Transaxle range switch shift lever

  1. Place the shift control assembly in NEUTRAL.
  2.  
  3. Push the tab on the cable adjuster to adjust the cable in the cable mounting bracket.
  4.  

 
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