GM S-Series Pick-ups and SUV's 1994-1999 Repair Guide

Front Driveshaft and U-Joints

Print

REMOVAL & INSTALLATION



See Figures 1, 2 and 3



Click image to see an enlarged view

Fig. Fig. 1: Front axle and driveline assembly-1994 vehicles



Click image to see an enlarged view

Fig. Fig. 2: Removing the driveshaft from the transfer case and front axle assembly-1995-97 vehicles



Click image to see an enlarged view

Fig. Fig. 3: It may be necessary to use a mallet to loosen the driveshaft from the transfer case shaft

DO NOT pound on the original driveshaft ears (unless the U-joints are being replaced) or the injected nylon U-joints may fracture.

  1. Raise and support the front of the truck safely using jackstands.
  2.  
  3. Matchmark the relationship of the driveshaft to the front axle and the transfer case flanges.
  4.  
  5. On 1994 vehicles, remove the driveshaft-to-retainer bolts and the retainers, first from the transfer case, then from the front axle.
  6.  
  7. On 1995-99 vehicles, remove the driveshaft-to-retainer bolts and the retainers front axle yoke.
  8.  
  9. On 1994 vehicles, collapse the driveshaft so it may be disengaged from the transfer case flange then from the front axle.
  10.  
  11. On 1995-99 vehicles, collapse the driveshaft and tilt it downward away from front axle end, then slide it out from the transfer case shaft.
  12.  

Use care when handling the driveshaft to avoid dropping the U-joint cap assemblies and loosing portions of the bearing assemblies.

  1. Wrap a length of tape around the loose caps to hold them in place.
  2.  

To install:
  1. Carefully insert the driveshaft into position in the vehicle.
  2.  
  3. Align the matchmarks made earlier, then remove the tape from the U-joints cap assemblies and position them to the flanges. Loosely install the retainers to hold the shaft in position.
  4.  
  5. Verify that the marks are properly aligned then tighten the retainers as follows:

    On 1994 vehicles, tighten the transfer case flange bolts and to 92 ft. lbs. (125 Nm) and the front axle flange bolts to 53 ft. lbs. (72 Nm).
     
    On 1995 vehicles, tighten the front axle flange bolts to 55 ft. lbs. (75 Nm).
     
    On 1996-99 vehicles, tighten the front axle flange bolts to 15 ft. lbs. (20 Nm).
     

  6.  
  7. Remove the jackstands and carefully lower the vehicle.
  8.  

U-JOINT REPLACEMENT



With the exception of the size socket/pipe which must be used to support the trunnion yoke on some driveshafts, U-joint replacement is identical between the front and rear driveshaft assemblies. Please refer to the procedure found later for the rear driveshaft to service the U-joints. Make sure an appropriately sized socket is used as a support. These driveshafts require a 1 1 / 8 in. socket used by most front and rear driveshafts.

 
label.common.footer.alt.autozoneLogo