Mazda Trucks 1987-1993 Repair Guide

Front and Rear Drive Axle

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FLUID RECOMMENDATIONS



API GL-4 or GL-5 80W-90 or 75W-90 gear lube is recommended.

LEVEL CHECK



See Figures 1 through 6



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Fig. Fig. 1: Location of the drain and fill plugs on the rear differential case



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Fig. Fig. 2: Wipe the area clean around the differential oil fill plug before opening to prevent any dirt from entering

The drive axle fluid level is checked from underneath the truck.

  1. Clean the dirt and grease away from the area of the filler (top) plug.
  2.  
  3. Remove the filler plug. The lubricant level should be even with the bottom of the filler plug hole.
  4.  
  5. If lubricant is required, use only the specified type. It will probably have to be pumped in through the filler hole. Hypoid SAE 90 lubricant usually does not pour very well.
  6.  

On Navajo models with the front locking differential, add 2 oz. of friction modifier Ford part No. EST-M2C118-A. On Navajo models with the rear locking differential, use only locking differential fluid Ford part No. ESP-M2C154-A or its equivalent, and add 4 oz. of friction modifier Ford part No. EST-M2C118-A.

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Fig. Fig. 3: After loosening the differential oil fill plug using a 24 mm box wrench, remove the plug and allow any excess fluid to drain into a container



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Fig. Fig. 4: After removing the fill plug, look inside the hole and inspect the fluid level, if it is overfilled, allow it to drain to the correct level



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Fig. Fig. 5: If the differentail fluid level is not visible, stick your finger into the hole and check to see if the level reaches the bottom level of the filler hole



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Fig. Fig. 6: Fill the differential housing with the correct amount and type of gear oil until fluid starts to trickle out

DRAIN AND REFILL



Pickups and MPV

See Figures 7 through 12

These models use a removable carrier axle which has a drain and fill plug.

  1. Jack the front and/or rear of the vehicle and support it with jackstands.
  2.  
  3. Position a suitable container under the axle drain plug. Remove the fill plug to provide a vent.
  4.  
  5. Remove the drain plug and allow the lubricant to drain out.
  6.  

Do not confuse the drain and fill plugs. The drain lug is magnetic to attract fine particles of metal which are inevitably present.

  1. Clean the magnetic drain plug.
  2.  
  3. Install the drain plug.
  4.  
  5. Fill the rear axle with the specified amount and type of fluid. Install the filler plug.
  6.  
  7. Lower the truck to the ground and drive the truck, checking for leaks after the fluid is warm.
  8.  



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Fig. Fig. 7: Be careful not to lose the fill plug washer, however, inspect the condition of the washer and replace it if necessary



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Fig. Fig. 8: Using a 24 mm socket, loosen the differential housing fluid drain plug



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Fig. Fig. 9: Remove the differential drain plug and allow the fluid to drain in an approved container



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Fig. Fig. 10: Be careful not to lose the differential drain plug washer, inspect and replace if necessary



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Fig. Fig. 11: Most differential drain plugs have a small magnet in the center to catch any small metallic fragments in the fluid



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Fig. Fig. 12: Always inspect the air vent tube or cap (located on the top of the differential housing) for obstructions and clean if necessary

Navajo

Remove the filler plug. Remove the oil with a suction gun. Refill the axle housings with the SAE 80W/90 gear oil. Be sure and clean the area around the drain plug before removing the plug.

 
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