Chevrolet Full-size Cars 1968-1978 Repair Guide

Drive Axle

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FLUID RECOMMENDATIONS & LEVEL CHECK





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Fig. Fig. 1 Remove the drive axle filler plug to check the fluid level. The fluid should be even with the filler hole



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Fig. Fig. 2 If necessary, carefully add fluid until it starts to trickle out of the filler hole

The oil in the differential should be checked at least every 6,000 miles (7,500 miles for 1975-78 cars).

  1. With the car on a level surface, 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, there is enough. Otherwise, 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.
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  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; making additions is simple. You can also use a common kitchen baster. Use only standard GL-5 hypoid-type gear oil-SAE 80W or SAE 80W/90.
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On all cars equipped with the positraction/limited slip rear axle, GM recommends that you use only the special lubricant which is available at your local Chevrolet parts department.

DRAIN & REFILL





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Fig. Fig. 3 Before removing the retaining bolts, clean the area around the cover



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Fig. Fig. 4 Also, look for any tags that may indicate special fluid needs-Posi-traction unit shown



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Fig. Fig. 5 Remove the bolts securing the cover to the drive axle ...



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Fig. Fig. 6 ... then carefully separate the cover to allow the fluid to drain



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Fig. Fig. 7 Remove the cover ...



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Fig. Fig. 8 ... then inspect the magnet for any large pieces of metal, which may indicate an internal problem



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Fig. Fig. 9 Cover the differential with a rag when scraping the old gasket off the drive axle mating surface

There is no recommended change interval for the rear axle but it is always a good idea to change the fluid 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.
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  3. Remove the filler plug.
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  5. Place a large container underneath the rear axle.
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  7. Unscrew the retaining bolts and remove the rear cover. This will allow the lubricant to drain out into the container.
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an environmental tip. Used oil contains heavy metals, and has been determined to be hazardous to the environment. Recycling oil is the best way for disposal. Recycle whenever possible.

  1. Install the rear cover using a new gasket and sealant. Tighten the retaining bolts in the crosswise pattern.
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  3. Refill with the proper grade and quantity of lubricant as detailed earlier in this information. Replace the filler plug, run the car and then check for any leaks.
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