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The stock axle breather vent location is not ideal. Jim Cook says he sees similar GM 14-bolt truck axles with 4.10:1 gears generate enough internal splash effect during extended highway driving that they lose oil, overheat, and fail.
Crate Axle Confessional -- Technical Article -- Chevy High Performance Magazine

The stock axle breather vent location is not ideal. Jim Cook says he sees similar GM 14-bolt truck axles with 4.10:1 gears generate enough internal splash effect during extended highway driving that they lose oil, overheat, and fail.  View Related Article

 

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