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How to grease the half shafts?

My Spicer half shafts are fitted with a Zerk fitting to allow the internal splines to be properly greased.

My question is how much grease is proper?

In order for grease to actually overflow into the spline area there is a very large void near the zerk fitting that would first have to be completely filled.

Previously I've always applied generous amounts of grease to the male and female splines but I am now wondering if I should hook up the grease gun to that zerk fitting and fill the entire void and shaft area.

What does the collective wisdom have to offer?

Larry
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