Here the problem.  '67 GMC C25 (3/4 ton) P/U has a Dana/Spicer 60 rear-end w/Full Floating Axles.  I had a bearing problem a few weeks ago.  I've cleared that mess up and now I'm putting it back together. For the wheel bearings on the full floater, the Spicer Axle Service manual says the bearings can be lubed either by axle grease or by rear-end gear lube, BUT that is as far as the Spicer Manual goes.  It says "to check vehicle manufacture's specs for specific lube".  All I have for Tech data on the '67; is the 67 - 72 Chevy/GMC Haynes Manual.  The Haynes Manual says to pack the bearings with grease.  One of our local mechanics says that is not right and the bearings are "wet lubed" from the differential.  I tried to get additional information on line and to find a "factory" 67 GMC Service manual, but have not had much luck. Anyone have any thoughts or info on these rear-ends?