Autoblog Maintenance 101: Differential/axle lube

Withfresh fluids in the rest of the drivetrain, it is now time to turn our attention to the axle lubrication. Where as westated that the transfer case fluid leads a relatively easy life, the same is not true of the rear axle. The reason forthis is heat; due to the relatively high frictional losses of the hypoid ring-and-pinion gears, axle lube temperaturescan exceed 300F during high-speed cruising. While certain ultra-high-performance vehicles such as the Corvette Z06 haveprovisions for axle cooling, most of us aren't so lucky. Throw in the fact that this lube isn't filtered and is prone tocontamination by water and other environmental matter, and it's essential that it be changed on a regular basis (twoyears or 25,000 miles isn't a bad starting point for a recommended service interval). We'll show you how it's done onthe 9.5" 14-bolt axle under the rear of our '96 GMC K2500.

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