GM Astro/Safari 1985-1996 Repair Guide

Shaft and Tube Assembly

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REMOVAL & INSTALLATION



1990-92 Vehicles
  1. Disconnect the negative battery cable for safety.
  2.  
  3. Unlock the steering column, then raise and support the vehicle safely using jackstands.
  4.  
  5. Remove the right front wheel.
  6.  
  7. Remove the halfshaft nut and washer.
  8.  

IMPORTANT: Support the lower control arm with a jackstand to unload the spring pressure.

  1. Remove the lower shock absorber bolt and nut.
  2.  
  3. Remove the output shaft bolts. Insert a drift through the opening in the top of the brake caliper into the vanes of the brake rotor.
  4.  
  5. Keep the shaft from turning and use a Posilock Puller Model 110 or equivalent to push the halfshaft through the hub.
  6.  
  7. Remove the right halfshaft.
  8.  
  9. Remove the tube support bracket nuts, carrier bolts, shaft and tube assembly.
  10.  

To install:
  1. Clean the sealing surfaces of the tube and carrier assembly with solvent.
  2.  
  3. Apply a bead of RTV sealer to the carrier sealing surface.
  4.  
  5. Install the shaft, tube and bolts. Torque the bolts to 36 ft. lbs. (48 Nm).
  6.  
  7. Install the support bracket nuts and torque to 55 ft. lbs. (75 Nm).
  8.  
  9. Install the halfshaft, output shaft-to-halfshaft bolts and torque to 60 ft. lbs. (80 Nm).
  10.  
  11. Install the lower shock bolt and nut.
  12.  
  13. Check the differential lubricant and add if necessary. Remember that the vehicle must be level or you will get an incorrect reading.
  14.  
  15. Install the front tire.
  16.  
  17. Remove the jackstands and carefully lower the vehicle.
  18.  


WARNING
Make sure the ignition switch is in the OFF position before connecting the negative battery cable otherwise the engine control computer could be INSTANTLY destroyed when voltage is applied.

1993-96 Vehicles
  1. Remove the right drive axle (halfshaft) from the vehicle. For details, please refer to the procedure located earlier in this section.
  2.  
  3. Remove the support bracket nuts and washers.
  4.  
  5. Remove the tube-to-carrier bolts.
  6.  
  7. Position a drain pan to catch any leaking fluid, then remove the tube and shaft assembly from the vehicle.
  8.  

To install:
  1. Thoroughly clean the sealing surfaces of the tube and carrier using a chlorinated solvent.
  2.  
  3. Apply a bead of sealant such as GM no. 12345739 or equivalent to the carrier sealing surface.
  4.  
  5. Install the shaft and tube assembly, then tighten the retaining bolts to 36 ft. lbs. (48 Nm).
  6.  
  7. Install the support bracket nuts and washers, then tighten to 54 ft. lbs. (73 Nm).
  8.  
  9. Install the right drive axle to the vehicle.
  10.  
  11. Check the differential lubricant and add if necessary. Remember that the vehicle must be level or you will get an incorrect reading.
  12.  

 
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