Repair Pontiac Mid-size 1974-1983 Repair Guide

Rear Axle

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LEVEL CHECK & FLUID RECOMMENDATIONS





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Fig. Fig. 1 Remove the filler plug to check the lubrication level in the rear axle



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Fig. Fig. 2 To check the rear axle fluid, use a socket and ratchet combination to loosen ...



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Fig. Fig. 3 ... then remove the filler plug from the side of the differential



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Fig. Fig. 4 If the level is low, add fluid through the hole until the level is at the edge of the hole

The oil in the differential should be checked at least every 7,500 miles.

  1. Park the car on a level surface and remove the filler plug from the front side of the differential.
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  3. If the oil begins to trickle out of the hole when the plug is removed, the differential is full. If no lubricant trickles out, carefully insert your finger (watch out for sharp threads) into the hole and check that the oil is up to the bottom edge of the filler hole.
  4.  
  5. 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 end, which makes adding lubricant simple. You can also use a common turkey baster for this job. Use only standard GL-5 hypoid-type gear oil-SAE 80W or SAE 80W/90.
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On all models equipped with a positraction/limited slip differential, GM recommends that you use only special GM lubricant available at your local Pontiac parts department.

DRAIN & REFILL



There is no recommended change interval for the rear axle lubricant, but it is always a good idea to change the lube if you have purchased the car used or if it has been driven in water high enough to reach the axle.

  1. Park the car on a level surface and set the parking brake.
  2.  
  3. Remove the rear axle filler plug on the front side of the differential housing.
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  5. Place a large drain pan underneath the rear axle.
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  7. Unscrew the retaining bolts and remove the rear axle cover. The axle lubricant will now be able to drain into the container.
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  9. Using a new cover gasket and sealant, install the axle cover. Tighten the retaining bolts in a crisscross pattern.
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  11. Refill the axle with the proper quantity (see "Capacities" chart in this section) of SAE 80W or SAE 80W-90 GL-5 gear lubricant. Replace the filler plug, take the car for a short ride and check for any leaks around the plug or rear cover.
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