Jeep CJ/Scrambler 1971-1986 Repair Guide

Shaft Drive Unit

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REMOVAL & INSTALLATION



The standard 6 splined 1 3 / 8 in. (34.925mm) diameter output shaft is driven through two helical cut gears mounted in a housing attached to the vehicle at the center of the frame rear crossmember.

  1. Disconnect the rear U-joint at the companion flange.
  2.  
  3. Remove the retaining screw and the flange.
  4.  
  5. Unbolt and remove the assembly from the vehicle.
  6.  
  7. Installation is the reverse of removal.
  8.  

DISASSEMBLY AND ASSEMBLY



  1. Drain the oil from the unit.
  2.  
  3. Remove the rear bearing cover.
  4.  
  5. Remove the nut and lockwasher from the input shaft.
  6.  
  7. Unbolt and remove the input shaft bearing retainer and remove the bearing. Take care not to lose the shims between the gear and the bearing case.
  8.  
  9. Remove the bearing cone, cup and snapring.
  10.  
  11. Remove the oil seal retainer and pilot assembly.
  12.  
  13. Press the shaft through the housing, removing the bearing cone, oil seal and retainer as an assembly.
  14.  
  15. Remove the input shaft gear through the rear opening. Push out the bearing cup and remove the snapring. Remove the bearing cone and oil seal from the shaft.
  16.  
  17. Remove the output shaft in the same manner as the input shaft.
  18.  
  19. Adjustment of the tapered roller bearings on both shafts is accomplished by shim packs placed between the gear hubs and bearing cones.
  20.  
  21. Assembly is the reverse of disassembly. Fill the unit with 90W gear oil.
  22.  

 
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