Mazda Trucks 1987-1993 Repair Guide

Rear Driveshaft

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REMOVAL & INSTALLATION



Navajo Models

See Figure 1



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Fig. Fig. 1: Rear driveshaft-single & double cardan type

  1. Disconnect the negative battery cable.
  2.  
  3. Raise and support the vehicle safely.
  4.  

The driveshaft is a balanced unit. Before removing the driveshaft, matchmark the driveshaft yoke in relationship to the axle flange so that it may be installed in its original position.

  1. Remove the retaining bolts and disconnect the driveshaft from the axle companion flange.
  2.  
  3. Remove the retaining bolts that retains the driveshaft to the rear of the transfer case.
  4.  
  5. Remove the driveshaft.
  6.  

To install:
  1. Install the driveshaft into the rear of the transfer case. Make certain that the driveshaft is positioned with the slip yoke toward the front of the vehicle. Install the bolts and tighten to 41-55 ft. lbs. (55-74Nm).
  2.  
  3. Install the driveshaft so the index mark on the rear yoke is in line with the index mark on the axle companion flange.
  4.  

Pickup and MPV Models

See Figures 2 through 12



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Fig. Fig. 2: Pickup rear driveshaft components



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Fig. Fig. 3: Stuff a rag into the CV U-joint to hold the driveshaft straight and prevent damage to the boot



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Fig. Fig. 4: Before removing any mounting nuts, matchmark the position of the driveshaft to the differential for correct reassembly



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Fig. Fig. 5: To separate the driveshaft from the differential housing, use two, 14 mm box wrenches and remove the four mounting nuts



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Fig. Fig. 6: Be careful not to lose the washer when removing the driveshaft-to-differential mounting nuts



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Fig. Fig. 7: Using a 14mm socket, loosen the ground wire retaining bolt ...



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Fig. Fig. 8: ... then remove the bolt, separating the ground wire from the driveshaft center bearing



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Fig. Fig. 9: Remove the driveshaft center bearing mounting bolts



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Fig. Fig. 10: After removing the center bearing mounting bolts, separate the driveshaft from the differntial housing ...



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Fig. Fig. 11: ... then, while supporting the driveshaft assembly, slide the driveshaft straight out of the extension housing



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Fig. Fig. 12: After removing the driveshaft, install a plug such as the one pictured, into the opening of the extension housing to prevent transmission fluid from dripping out

  1. Matchmark the rear U-joint with the rear companion flange. Remove the bolts attaching the driveshaft to the rear companion flange.
  2.  
  3. Remove the center support bearing bracket from the underbody.
  4.  
  5. Pull the driveshaft rearward and out of the transmission. Plug the rear seal opening.
  6.  
  7. Installation is the reverse of removal. Make sure that you align the matchmarks. Torque the rear companion flange bolts to 39-47 ft. lbs.; the center bearing bracket nuts to 27-38 ft. lbs.
  8.  

u-joint replacement

For replacement procedures for the single cardan U-joint, refer to u-joint replacement under "Front Driveshaft and U-Joints" earlier in this section.

DRIVESHAFT BALANCING



See Figures 13, 14 and 15



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Fig. Fig. 13: Mark and number the shaft (yoke end) at four positions 90 apart.



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Fig. Fig. 14: If the vibration decreases, install a second clamp



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Fig. Fig. 15: If the second clamp causes additional vibration, rotate the clamps in opposite directions

Unbalance

Propeller shaft vibration increases as the vehicle speed is increased. A vibration that occurs within a specific speed range is not usually caused by a propeller shaft being unbalanced. Defective universal joints, or an incorrect propeller shaft angle, are usually the cause of such a vibration.

If propeller shaft is suspected of being unbalanced, it can be verified with the following procedure.

Removing and re-indexing the propeller shaft 180relative to the yoke may eliminate some vibrations.

  1. Raise and safely support the vehicle securely on jackstands.
  2.  
  3. Clean all the foreign material from the propeller shaft and the universal joints.
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  5. Inspect the propeller shaft for missing balance weights, broken welds, and bent areas. If the propeller shaft is dented or bent, it must be replaced.
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  7. Inspect the universal joints to ensure that they are not worn, are properly installed, and are correctly aligned with the shaft.
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  9. Check the universal joint clamp bolt torque.
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  11. Remove the wheels and tires. Install the wheel lug nuts to retain the brake drums or rotors.
  12.  
  13. Mark and number the shaft six inches (15.24cm) from the yoke end at four positions 90 apart.
  14.  
  15. Run and accelerate the vehicle until vibration occurs. Note the intensity and speed the vibration occurred. Stop the engine.
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  17. Install a screw clamp at any position.
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  19. Start the engine and re-check for vibration. If there is little or no change in vibration, move the clamp to one of the other three positions. Repeat the vibration test.
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  21. If there is no difference in vibration at the other positions, the source of the vibration may not be propeller shaft.
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  23. If the vibration decreased, install a second clamp and repeat the test.
  24.  
  25. If the additional clamp causes additional vibration, rotate the clamps ( 1 / 4 inch above and below the mark). Repeat the vibration test.
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  27. Increase distance between the clamp screws and repeat the test until the amount of vibration is at the lowest level. Bend the slack end of the clamps so the screws will not loosen.
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  29. If the vibration remains unacceptable, apply the same steps to the front end of the propeller shaft.
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  31. Install the wheel and tires.
  32.  
  33. Lower the vehicle.
  34.  

Run-out

See Figure 16



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Fig. Fig. 16: Measure the front and rear shaft runout, replace if the runout is excessive

  1. Remove dirt, rust, paint, and undercoating from the propeller shaft surface where the dial indicator will contact the shaft.
  2.  
  3. The dial indicator must be installed perpendicular to the shaft surface.
  4.  

Measure front/rear run-out approximately 3 inches (76mm) from the weld seem at each end of the shaft tube for tube lengths over 30 inches (76.2cm).

  1. Measure run-out at the center and ends of the shaft sufficiently far away from weld areas to ensure that the effects of the weld process will not enter into the measurements.
  2.  
  3. Replace the propeller shaft if the run-out exceeds 0.035 inch (0.89mm) on Navajo and 0.016 inch (0.40mm) on Pickup and MPV models.
  4.  

 
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