GM Caprice 1990-1993 Repair Guide

Rear Control Arms

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REMOVAL & INSTALLATION



UPPER ARM

If both control arms are to be replaced, remove and replace 1 control arm at a time to prevent the axle from rolling or slipping sideways.

  1. Raise and support the vehicle safely. Be sure to support the rear axle housing with a jackstand.
  2.  
  3. Disconnect the ABS rear axle speed sensor, if equipped.
  4.  
  5. If equipped, disconnect the height sensor link from the upper control arm by removing the attaching nut and sliding the sensor link stud out of the hole in the control arm.
  6.  
  7. Disconnect the stabilizer shaft bolts and washers from the upper control arm, for 1990 vehicles.
  8.  
  9. Remove the nut and bolt at the rear axle housing. Disconnect the upper control arm from the housing.
  10.  
  11. Remove the nut and bolt at the rear frame crossmember. Remove the upper control arm from the vehicle.
  12.  

To install:
  1. Loosely attach the upper control arm to the rear frame crossmember using the nut and bolt.
  2.  
  3. Loosely attach the upper control arm to the rear axle housing using the nut and bolt.
  4.  
  5. For 1990 vehicles, loosely attach the stabilizer shaft and bolt.
  6.  
  7. Remove the jackstand from the rear axle and place supports under the tires. Lower the vehicle enough so the vehicle weight rests on the tires.
  8.  
  9. With the weight of the vehicle on the tires, tighten the bolt at the rear frame crossmember to 114 ft. lbs. (155 Nm) or the nut to 91 ft. lbs. (123 Nm). Either the nut or the bolt must be tightened, torque whichever is easiest to access.
  10.  
  11. With the weight of the vehicle on the tires, tighten the bolt at the rear axle housing to 80 ft. lbs. (108 Nm) or the nut to 70 ft. lbs. (95 Nm). Once again, torque whichever is easiest to access.
  12.  
  13. If applicable, with the weight of the vehicle on the tires, tighten the stabilizer shaft bolt to 52 ft. lbs. (70 Nm).
  14.  
  15. Connect the height sensor link to the upper control arm, if applicable, and tighten nut to 27 inch lbs. (3 Nm).
  16.  
  17. Connect the ABS rear axle speed sensor, if equipped.
  18.  
  19. Remove the tire supports, lower the vehicle and, if necessary, adjust the height sensor.
  20.  

LOWER ARM

If both control arms are to be replaced, remove and replace 1 control arm at a time to prevent the axle from rolling or slipping sideways.

  1. Raise and support the vehicle safely. Be sure to support the rear axle housing with a jackstand.
  2.  
  3. Disconnect the stabilizer shaft bolts and washers, for 1991-93 vehicles.
  4.  
  5. Remove the nut and bolt from the bracket on the axle tube.
  6.  
  7. Remove the nut and bolt from the crossmember brace, if equipped, and from the bracket on the frame.
  8.  
  9. Remove the lower control arm from the vehicle.
  10.  

To install:
  1. Position the lower control arm on the vehicle.
  2.  
  3. Loosely install the nuts and bolts to the frame bracket, axle tube bracket and, if applicable, to the stabilizer shaft.
  4.  
  5. Remove the jackstand from the rear axle and place supports under the tires. Lower the vehicle enough so that the vehicle weight rests on the tires.
  6.  
  7. With the weight of the vehicle on the tires, tighten either the nut or the bolt, whichever is easiest to access. For 1990 vehicles tighten the lower control arm bolts to 122 ft. lbs. (165 Nm) or the nuts to 92 ft. lbs. (125 Nm). For 1991-93 vehicles tighten the lower control arm bolts to 74 ft. lbs. (100 Nm) or the nuts to 91 ft. lbs. (123 Nm).
  8.  
  9. If applicable, tighten the stabilizer bolts to 52 ft. lbs. (29 Nm).
  10.  
  11. Remove the tire supports and lower the vehicle.
  12.  

 
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