Toyota Celica/Supra 1971-1985 Repair Guide

Differential

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FLUID LEVEL CHECK



See Figures 1, 2, 3, 4 and 5



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Fig. Fig. 1: Using the correct size wrench, loosen the filler plug



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Fig. Fig. 2: Remove the plug and make sure the washer comes off with it



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Fig. Fig. 3: Feel inside the hole with your finger to check the level of fluid



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Fig. Fig. 4: Correct fluid level on 1982 and later independent rear axles



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Fig. Fig. 5: Top off the differential with gear oil

The oil in the differential should be checked at least every 15,000 miles (24,000 km) and replaced every 25,000-30,000 miles (40,225-48,270 km).

  1. With the car on a level surface, remove the filler plug from the back of the differential.
  2.  

The plug on the bottom is the drain plug.

  1. If the oil begins to trickle out of the hole, there is enough. Otherwise, carefully insert your finger into the hole (watch out for sharp threads) and check to see if the oil is up to the bottom edge of the filler hole.
  2.  
  3. If not, add oil through the hole until the level is at the edge of the hole. Most gear oils come in a plastic squeeze bottle with a nozzle, making additions simple. You can also use a common kitchen baster. Use standard GL-5 hypoid type gear oil; SAE 90 or SAE 80 if you live in a particularly cold area.
  4.  
  5. Replace the filler plug and drive the car for a while. Stop the car and check for leaks.
  6.  

DRAIN AND REFILL



See Figures 6, 7 and 8



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Fig. Fig. 6: The upper arrow shows the filler plug and the lower one the drain plug

The gear oil in the rear axle should be changed at least every 25,000-30,000 miles (40,225-48,270 km).

  1. Park the vehicle on a level surface. Set the parking brake.
  2.  
  3. Remove the filler (upper) plug. Place a container which is large enough to catch all of the differential oil, under the drain plug.
  4.  



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Fig. Fig. 7: Loosen the drain plug on the bottom of the differential



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Fig. Fig. 8: Add hypoid gear oil until it begins to run out of the differential's filler hole

  1. Remove the drain (lower) plug and gasket, if so equipped. Allow all of the oil to drain into the container.
  2.  
  3. Install the drain plug. Tighten it so that it will not leak, but do not overtighten.
  4.  
  5. Refill with the proper grade and viscosity of axle lubricant (see the Recommended Lubricants chart). Be sure that the level reaches the bottom of the filler plug (or to within 5mm of the plug on independent type differentials). DO NOT overfill.
  6.  
  7. Install the filler plug and check for leakage.
  8.  

 
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