GM Celebrity/Century/Ciera/6000 1982-1996 Repair Guide

Driveshaft and U-Joint

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REMOVAL & INSTALLATION



Original Driveshaft

See Figure 1

  1. Raise and safely support the vehicle.
  2.  



Click image to see an enlarged view

Fig. Fig. 1: Driveshaft assembly on the 6000 STE AWD

The relationship between the center bearing support and the floor pan must be maintained. Established at the assembly plant, the relationship has an influence on the front joint stoke capacity and remains constant for the vehicle, regardless of the driveshaft installed.

  1. Scribe the transaxle output shaft flange opposite the "painted" marking on the front driveshaft. The rear pinion flange must be scribed opposite the "painted" marking on the rear driveshaft. Scribe the center support mounting plate to floor pan of the vehicle.
  2.  
  3. Remove the 4 bolts connecting the rear driveshaft to the rear axle pinion flange. Be sure to support the rear of the rear driveshaft while removing the remainder of the driveshaft.
  4.  

Do not loosen, remove or disconnect the 4 bolts adjacent to the center double cardan joint. Disturbing these fasteners may result in a vibration.

  1. With the aid of an assistant, support the driveshaft while performing the following:
    1. Remove the 3 nuts retaining the center bearing support to the underbody of the vehicle.
    2.  
    3. Remove the 4 bolts connecting the front driveshaft to the transaxle output shaft flange.
    4.  
    5. Remove the driveshaft from the vehicle.
    6.  

  2.  

To install:
  1. With the aid of an assistant, perform the following:
    1. Install the driveshaft to the vehicle.
    2.  
    3. Align the rear driveshaft flange to the rear axle pinion flange, aligning the scribe marks.
    4.  
    5. Loosely install the nuts to the center bearing support and bolts to the rear axle pinion flange. Tighten the rear driveshaft flange to the rear axle pinion flange bolts to 40 ft. lbs. (54 Nm).
    6.  
    7. Install the bolts to the front driveshaft-to-transaxle output flange, using the reference marks to align the front flange position and center bracket location. Tighten the center bearing support bolts using the scribed reference marks to 25 ft. lbs. (34 Nm); nuts to 20 ft. lbs. (27 Nm). Tighten the front propeller shaft-to-transaxle output flange bolts to 40 ft. lbs. (54 Nm).
    8.  

  2.  

The center mount plate must be reinstalled at the scribed position so that the front CV-joint is correctly located within its travel limits.

  1. Remove the support and lower the vehicle.
  2.  
  3. Road test the vehicle.
  4.  

New Driveshaft
  1. Remove the original driveshaft from the vehicle.
  2.  

To install:
  1. Using a dial indicator, measure and mark the bolt hole corresponding to the high point of radial run-out on both the transaxle output flange and rear axle pinion flange.
  2.  
  3. Transfer the center bearing bracket from the old driveshaft to the new driveshaft assembly.
  4.  
  5. With the aid of an assistant, perform the following:
    1. Install the driveshaft to the vehicle.
    2.  
    3. Align the point marks supplied on the flanges of the propeller shaft to the scribe marks made during removal.
    4.  
    5. Loosely install the nuts to the center bearing support and bolts to the rear axle pinion flange. Tighten the rear driveshaft flange to the rear axle pinion flange bolts to 40 ft. lbs. (54 Nm).
    6.  
    7. Push the propeller shaft forward until a click is heard. Temporarily install a 0.9 in. (23mm) thick spacer between the output flange and the front driveshaft flange. Clamp in this position.
    8.  

  6.  
  7. Install the remaining center bracket nuts. Tighten to 20 ft. lbs. (27 Nm).
  8.  
  9. Remove the spacer, extend the front CV-joint to meet the output flange and tighten the bolts. Tighten the front propeller shaft-to-transaxle output flange bolts to 40 ft. lbs. (54 Nm).
  10.  
  11. Verify correct location of the front CV-joint plunge.
  12.  
  13. Remove the supports. Lower the vehicle.
  14.  

U-JOINT REPLACEMENT



See Figure 2

A universal joint is two Y-shaped yokes connected by a crossmember called a spider. The spider is shaped like a cross having arms of equal length called trunnions. These U-joints are designed to handle the effects of various loadings and the rear axle windup during acceleration. Unfortunately these U-joints are not replaceable in the driveshaft unit. If you have any U-joint problems, the driveshaft unit must be replaced.

CENTER BEARING



See Figure 3

A center support bearing is used to support the driveline at the connection of the driveshafts. The center bearing is a ball-type bearing mounted in a rubber cushion that is attached to the under body of the vehicle. The bearing is pre-lubricated and is sealed during manufacture.



Click image to see an enlarged view

Fig. Fig. 2: The U-joint assembly on the 6000 STE AWD is not replaceable



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Fig. Fig. 3: A center support bearing is used to support the driveline at the connection of the driveshafts

 
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