99 tahoe diff fluid leaking

I pulled off my drum today to tighten the rear brakes, and there is differential fluid leaking into the drum. Its just a little now, but I assume its only gonna get worse. Anyone know what I'll need to replace?

I pulled off my drum today to tighten the rear brakes, and there is differential fluid leaking into the drum. Its just a little now, but I assume its only gonna get worse. Anyone know what I'll need to replace?

Axel seal to start with.
Also check axel bearing and axel where bearing runs.

I pulled off my drum today to tighten the rear brakes, and there is differential fluid leaking into the drum. Its just a little now, but I assume its only gonna get worse. Anyone know what I'll need to replace?

since the axles need be removed to do this,,,,,, replacing the wheel bearings , and a close inspection of the axle surface in the bearing area is needed..

having a good bearing condition is needed with the drum brakes....