GM Blazer/Jimmy/Typhoon/Bravada 1983-1993 Repair Guide

Front Driveshaft and U-Joints

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REMOVAL & INSTALLATION



Except Typhoon

See Figures 1, 2, 3 and 4

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



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Fig. Fig. 1: Loosen and remove the U-joint retainers from the flanges



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Fig. Fig. 2: Tape the U-joint cap assemblies to prevent the possible loss of components

  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. Remove the driveshaft-to-retainer bolts and the retainers, first from the transfer case, then from the front axle.
  6.  
  7. Collapse the driveshaft so it may be disengaged from the transfer case flange.
  8.  
  9. Move the driveshaft rearward (between the transfer case and the chassis) to disengage it from the front axle.
  10.  

Use care when handling the driveshaft to avoid dropping the U-joint cap assemblies and losing 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-joint 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 to 15 ft. lbs. (20 Nm) for vehicles through 1991, or to 92 ft. lbs. (125 Nm) for the transfer case flange bolts and 53 ft. lbs. (72 Nm) for front axle flange bolts on 1992-93 vehicles.
  6.  
  7. Remove the jackstands and carefully lower the vehicle.
  8.  



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Fig. Fig. 3: Common early model front driveline assembly



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Fig. Fig. 4: Late model front driveline assembly

Typhoon

See Figure 5

  1. Raise and support the front of the vehicle safely using jackstands.
  2.  
  3. Remove the retaining bolts from the flange at the transfer case.
  4.  
  5. Remove the retaining bolts from the flange at the front axle.
  6.  
  7. Pull the axle forward and downward, then remove it from the vehicle.
  8.  



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Fig. Fig. 5: Front axle and driveline assembly - Typhoon

To install:
  1. Inspect the shroud and boot for cracking or deterioration. Replace the entire assembly if evidence of damage is found. Also, check the front shaft for dents or bending.
  2.  
  3. Carefully install the shaft to the vehicle while aligning the matchmarks made during removal. Loosely install the retaining bolts to hold the shaft in position.
  4.  
  5. Tighten the transfer case flange bolts, followed by the axle flange bolts to 52 ft. lbs. (70 Nm).
  6.  
  7. Remove the jackstands and carefully lower the vehicle.
  8.  

U-JOINT REPLACEMENT



With the exception of the particular size socket/pipe which must be used to support the trunnion yoke on some earlier model driveshafts, U-joint replacement is identical between the front and rear driveshaft assemblies. Please refer to the rear driveshaft procedure later in this section to service the U-joints. Make sure an appropriately sized socket is used as a support on early model front driveshafts, these will require a 1 1 / 4 in. socket as opposed to the 1 1 / 8 in. socket used for later models and most rear driveshafts.

 
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