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.
See Figures 1, 2, 3 and 4