GM Full-Size Trucks 1970-1979 Repair Guide

Drive Axle (Rear and/or Front)

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FLUID RECOMMENDATIONS



Front axles use SAE 80W-90, GL-5 gear lubricant. Rear axles use SAE 80W-90 gear oil. Positraction axles must use special lubricant available from dealers. If the special fluid is not used, noise, uneven operation, and damage will result. There is also a Positraction additive used to cure noise and slippage. Positraction axles have an identifying tag, as well as a warning sticker near the jack or on the rear wheel well.

LEVEL CHECK



See Figures 1, 2, 3 and 4



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Fig. Fig. 1: Using a wire brush, clean the area around the filler filler plug



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Fig. Fig. 2: Use the proper sized ratchet and socket combination and unfasten ...



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Fig. Fig. 3: ... then remove the filler plug from the differential housing cover


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