Closed knuckle lube issue

[Short 3/4]

I’ve got the stock closed knuckle D44 8-lug on the front of my ‘65.

A couple years ago I had a local gear shop go through the entire front end and replace all bearings and seals. I had them fill the diff with conventional 90W GL-5 and the knuckles with JD Cornhead grease, which I’ve used in the past and am a big fan of.

I’ve topped up the knuckles a few times since to get the level even with the plug (kind of hard to do with the grease at room temperature). Between the new seals and Cornhead I have no external leaks, which makes me very happy.

I’ve drained the diff about three times since the rebuild and each time the oil has a green tint to it. I can see that there might be some contamination between the lubricants during initial assembly, but I’m not sure if the knuckle lube is continuing to leak into the diff, or if it just takes multiple flushes to get the green color out. Also not sure how compatible the Cornhead is with the 90W.

Anyone else out there have this problem?

Thanks
Tom