Re: 99 K2500 rear axle hub seal leak
It could be a pinion bearing making the noise. Down shift to 3rd or 2nd. Let off the gas. Does it make the same noise? I pinion bearing will make load when there is any kind of twisted load on the axle, whether it's up or down.
Clean off the spindle where the sequel rides with emery cloth. Get it as clean as you can.
You'd have better luck in the 88-98 section.
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