GM Caprice 1990-1993 Repair Guide

Driveshaft

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See Figure 1



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Fig. Fig. 1: Rear driveshaft assembly

REMOVAL & INSTALLATION



  1. Raise the vehicle and safely support it on jackstands. Paint a reference line from the rear end of the driveshaft to the companion (axle) flange so they can be reassembled in the same position.
  2.  
  3. Disconnect the rear universal joint by removing the U-bolts, retaining straps, or the flange bolts.
  4.  
  5. To prevent loss of the needle bearings, tape the bearing caps to the trunnion.
  6.  
  7. Remove the floorpan reinforcement, as required.
  8.  
  9. Remove the driveshaft from the transmission by sliding it rearward.
  10.  

Do not be alarmed by oil leakage at the transmission output shaft. This oil is there to lubricate the splines of the front yoke.

  1. To install, check the yoke seal in the transmission case extension and replace it if necessary. See the transmission section for replacement procedures.
  2.  
  3. Position the driveshaft and insert the front yoke into the transmission so that the splines mesh with the splines of the transmission shaft.
  4.  
  5. Using reference marks made during removal, align the driveshaft with the companion flange and secure it with U-bolts or, retaining straps.
  6.  
  7. Install the floorpan reinforcement.
  8.  

U-JOINT REPLACEMENT



See Figures 2 through 6



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Fig. Fig. 2: Internal snapring U-joint assembly



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Fig. Fig. 3: Pressing out the U-joint



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Fig. Fig. 4: Insert spacer tool to push cup out of joint all the way

  1. Support the driveshaft horizontally in line with the base plate of a press.
  2.  
  3. Place the U-joint so the lower ear of the shaft yoke is supported on a 1 1 / 8 inch socket.
  4.  
  5. Remove the lower bearing cap out of the yoke ear by placing tool J-9522-3 or equivalent, on the open horizontal bearing caps and pressing the lower bearing cap out of the yoke ear.
  6.  

This will shear the nylon injector ring, if the original U-joint is being removed. There are no bearing retaining grooves in the production bearing caps, therefore they cannot be reused. If a replacement U-joint is being removed, ensure to remove the retaining clips from the U-joint.

  1. If the bearing cap is not completely removed, lift tool J-9522-3 and insert tool J-9522-5 or equivalent between the bearing cap and seal and continue pressing the U-joint out of the yoke.
  2.  



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Fig. Fig. 5: Installing snapring



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Fig. Fig. 6: Seating the snapring

  1. Repeat the procedure for the opposite side.
  2.  
  3. Remove the spider from the yoke.
  4.  

To install:
  1. Install 1 bearing cap part way into 1 side of the yoke. Turn this yoke ear to the bottom.
  2.  
  3. Using tool J-9522-3 or equivalent, seat the trunnion into the bearing cap.
  4.  
  5. Install the opposite bearing cap partially onto the trunnion.
  6.  
  7. Ensure both trunnions are straight and true in the bearing caps.
  8.  
  9. Press the spider against the opposite bearing cap, while working the spider back and forth to ensure free movement of the trunnions in the bearing caps.
  10.  
  11. If trunnion is binding, the needle bearings have tipped over under the end of the cap.
  12.  
  13. Stop pressing when 1 bearing cap clears the retainer groove inside the yoke.
  14.  
  15. Install a retaining ring.
  16.  
  17. Repeat the procedure for the remaining bearing caps and U-joints.
  18.  
  19. Installation of the driveshaft is the reverse of the removal procedure. Tighten the strap bolts to 16 ft. lbs. (22 Nm).
  20.  

Some Saginaw shafts use two different sizes of bearing cups at the differential end. The larger cups (the ones with the groove) fit into the driveshaft yoke.

 
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