<VV> Gear Oil Blowing out Vent

[Mikeamauro at aol.com]

For some time now, my 67 PG coupe has had a propensity to blow axle gear  
lube out the vent. As one might imagine, the tendency is greatest when the lube  
level is at its highest, proper level (just at the bottom of the 
fill/inspection  hole), When enough lube has blown out to lower the level to 1-pint low, 
the blow  out stops. I'm using synthetic gear lube, but the blow out has  equal 
with synthetic or standard lube. After a run down the highway  and stopping, 
the drip offs typically equal two or three spots about 2" in  diameter.
 
Has anyone had the same issue and solved it; and, if so, what was the root  
cause?
 
Thanks in advance for any leads.
 
Mike Mauro



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