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The first thing that comes to mind is its overfull of oil..but since there is no real way to check the level, it should stop leaking. yes...stop leaking on its own. if you have been driving the truck in and out of mud holes, this will cause it to leak also... the differential is hot before it hits the water, then when it hits the water the sudden change in temp will cause a vacuum at the axle seals, in turn will suck water through the axle seals and Finally PUSH WATER AND OIL OUT THE VENT ON THE TOP....

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13y ago
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Q: Why in your 88 Chevy 4x4 front differential leaking oil through its vent hose?
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