Jeep CJ 1945-1970 Repair Information

Drive Axles

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FLUID LEVEL CHECK



See Figures 1 and 2



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Fig. Fig. 1: The fill plugs on both the front and rear drive axles are located in the middle of the differential covers



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Fig. Fig. 2: Before checking and/or draining the differential fluid, brush away dirt from both the drain and fill plugs

The standard front and rear axle differentials use SAE 80W/90 gear oil. Either is acceptable for use in the differential housing. Powr-Lok® differentials use only Jeep Powr-Lok® Lubricant or its equivalent. In Trac-Lok® axles, use any limited slip gear oil meeting SAE 75W/90, 80W/90 or 85W/90 specifications. Check the level of the oil in the differential housing every 5,000 miles (8,000 km) under normal driving conditions and every 3,000 miles (4,800 km) if the vehicle is used in severe driving conditions. The level should be up to the filler hole. When you remove the filler plug, the oil should start to run out. If it does not, replenish the supply until it does.

The lubricant should be changed every 30,000 miles (48,000 km). If running in deep water, change the lubricant daily.

DRAIN & REFILL



See Figures 1 through 10



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Fig. Fig. 3: To drain the differential fluid, first loosen (but do not remove) the fill plug



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Fig. Fig. 4: Remove the drain plug ...



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Fig. Fig. 5: ... and allow the differential oil to drain into a catch pan



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Fig. Fig. 6: Remove the fill plug in order to fill the differential case



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Fig. Fig. 7: If the differential cover gasket leaks and must be replaced, remove the retaining bolts



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Fig. Fig. 8: Gently pry the cover away from the case and allow residual oil to drain



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Fig. Fig. 9: Remove the case cover from the differential and ...



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Fig. Fig. 10: ... cover the differential with a shop rag, then remove any old gasket material

  1. Use a wire brush or rag to clean the area around the drain and fill plugs.
  2.  
  3. Loosen (but do not remove) the fill plug, to make sure that it can be turned easily. If necessary, spray penetrating lubricant.
  4.  
  5. Position a suitable catch pan, then loosen and remove the drain plug. Allow the lubricant to empty out.
  6.  
  7. If the differential cover gasket leaks (or differential service is required), perform Steps 4a-4d:
    1. Remove the axle differential housing cover and allow the remaining lubricant to drain into the pan.
    2.  
    3. Cover the differential with a clean rag, and remove any old gasket material. Remove the rag.
    4.  
    5. Install the differential housing cover with a new gasket.
    6.  
    7. Tighten the cover attaching bolts to 15-25 ft. lbs. (20-34 Nm).
    8.  

  8.  
  9. Install and tighten the drain plug.
  10.  
  11. Remove the fill plug and add new lubricant to the fill hole level.
  12.  
  13. Install and tighten the fill plug.
  14.  

Trac-Lok® (limited-slip) differentials may be cleaned only by disassembling the unit and wiping with clean, lint-free rags.

 
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