Subaru Coupes/Sedans/Wagons 1985-1996 Repair Guide

Rear Drive Axle (4WD)

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The lubricant should be checked at regular intervals and changed at 60,000 mile (96,500 km) intervals. When the vehicle is frequently operated under severe conditions, the lubricant should be changed at 30,000 mile (48,300 km) intervals.

FLUID RECOMMENDATIONS



Use gear oil with API classification GL-5 for open differentials and GLS for limited slip differential. Viscosity should be:



SAE 90-above 30°F (-1°C)
 
SAE 85W-above 30°F (-1°C)
 
SAE 80W-below 0°F (-18°C)
 

LEVEL CHECK



See Figures 1 and 2

Click image to see an enlarged view

Fig. Fig. 1: Rear differential fill and drain plugs-all 4WD models except Justy



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Fig. Fig. 2: Justy rear differential fill and drain plugs

Unlike the procedures outlined above, the lubricant level in the rear differential must be checked from underneath the vehicle.

  1. Park the car on a level surface, turn OFF the engine and engage the parking brake.
  2.  
  3. Crawl under the car from the rear until the differential housing can be reached easily.
  4.  
  5. Remove the filler hole (upper) plug from the back of the differential case.
  6.  
  7. The lubricant should be at the level of the filler hole. If not, add the proper weight gear oil with API classification of GL-5 or GLS.
  8.  
  9. Install the filler plug and tighten to 33 ft. lbs. (44 Nm).
  10.  

DRAIN AND REFILL



See Figures 3, 4, 5 and 6

Click image to see an enlarged view

Fig. Fig. 3: Loosen the lower drain plug on the differential-Legacy shown



Click image to see an enlarged view

Fig. Fig. 4: With a suitable drain pan placed beneath the differential, remove the plug and allow the fluid to drain



Click image to see an enlarged view

Fig. Fig. 5: Clean any metal particles from the magnetic tip of the drain plug



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Fig. Fig. 6: Add fluid through the upper fill hole

  1. Park the car on a level surface, turn off the engine and engage the parking brake.
  2.  
  3. Crawl under the car from the rear until the differential housing can be reached easily.
  4.  
  5. Place a container of adequate capacity beneath the drain plug.
  6.  
  7. Remove the filler hole (upper) plug from the back of the differential case.
  8.  
  9. Remove the drain hole (lower) plug from the back of the differential case and drain all lubricant from the differential.
  10.  
  11. Install the drain hole plug and tighten to 33 ft. lbs. (44 Nm).
  12.  
  13. Fill the differential with the proper grade of lubricant until the level of the lubricant is at the filler hole.
  14.  
  15. Install the filler hole plug and tighten to 33 ft. lbs. (44 Nm).
  16.  

 
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