Rookie2 said:I figure that after they were overfilled, there was no room for the grease to breathe. So now you go driving. Through your test, we already know that the inside of the birf is somewhat of a mixing bowl. Once the grease heats up, it's going to expand some. Combine that with flapper on the diff vent, and it's just a bad formula. I think these things created enough preassure/vacuum to push grease past and compromise the axle seal.
So anyways, about a month or so after I filled the knuckles, it looked like a cow had taken a shat on my axle balls.
Rookie2
I don't think there is any way for grease to "expand" that much that it would exert serious pressure on anything in there unless the grease was seriously compacted in in the first place... When solids or liquids expand due to high temp thermal effects, we are talking about %s of volume, not huge amounts. It's not like liquid water and ice....