Mazda Trucks 1994-1998 Repair Guide

Rear Driveshaft and U-Joints

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REMOVAL & INSTALLATION



Navajo and B Series Pick-up Models

See Figures 1 and 2



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



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Fig. Fig. 2: Rear driveshaft-single cardan type

  1. Raise and safely support the vehicle.
  2.  
  3. Mark the driveshaft in relation to the rear axle flange. If necessary, mark the relation of the driveshaft to the transfer case flange.
  4.  
  5. If equipped with a center bearing assembly, remove the retaining bolts and the spacers under the center bearing bracket, if installed.
  6.  
  7. Remove the attaching bolts and disconnect the driveshaft from the rear axle flange.
  8.  
  9. On 2WD models, slide the driveshaft rearward until the slip yoke clears the transmission extension housing and remove the driveshaft. Plug the extension housing to prevent fluid leakage.
  10.  
  11. On 4WD models, remove the bolts attaching the driveshaft to the transfer case flange and remove the driveshaft.
  12.  

To install:
  1. On 2WD models, lubricate the splines of the slip yoke. Remove the plug from the extension housing and install the driveshaft assembly. Do not allow the slip yoke to bottom on the output shaft with excessive force.
  2.  
  3. On 4WD models, install the driveshaft to the transfer case flange, aligning the marks that were made during removal. Install the attaching bolts and tighten to 61-87 ft. lbs. (83-118 Nm) if equipped with constant velocity U-joints or 12-16 ft. lbs. (17-22 Nm) if equipped with double cardan U-joints.
  4.  
  5. Connect the driveshaft to the rear axle flange, aligning the marks that were made during removal. Install the retaining bolts and tighten to 70-95 ft. lbs. (95-129 Nm).
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  7. If equipped, install the center bearing attachment bolts and tighten to 27-37 ft. lbs. (37-50 Nm). Make sure the center bearing bracket is installed "square" to the vehicle. If spacers were installed under the center bearing bracket, make sure they are reinstalled.
  8.  
  9. Lower the vehicle.
  10.  

MPV Models

See Figures 3 through 12



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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 ...

  1. Raise and safely support the vehicle.
  2.  
  3. Stuff a rag into the CV U-joint to hold the driveshaft straight and prevent damage to the boot.
  4.  
  5. Matchmark the flanges and remove the mounting nuts and bolts at the differential.
  6.  



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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. Remove the bolts at the center bearing support assembly.
  2.  
  3. If rear wheel drive only, remove the driveshaft from the transmission. If equipped with 4WD, remove the driveshaft from the transfer case. Cap the opening to prevent spillage of fluid.
  4.  
  5. Installation is the reverse of removal. Align the flange marks when installing. Torque the mounting bolts at the differential to 37-43 ft. lbs. (50-58 Nm). Torque the bolts for the center support to 27-39 ft. lbs. (37-53 Nm).
  6.  

u-joint replacement

Single Cardan Type U-Joint

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

Double Cardan Type U-Joint

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

Constant Velocity (CV) Type U-Joint

The CV U-joint is found on all MPV model rear driveshafts. This U-joint is not a servicable component. If the CV U-joint requires service, the driveshaft must be replaced.

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.
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  13. Mark and number the shaft six inches (15.24cm) from the yoke end at four positions 90 apart.
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  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.
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  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.
  30.  
  31. Install the wheel and tires.
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  33. Lower the vehicle.
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Run-out
  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 B Series Pick-up models, and 0.016 inch (0.40mm) on MPV models.
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