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G.O = gear oil. That could mean gl 1 or gl 5 or whatever. 80w-90 is usually gl-5. Non detergent strait weight engine oil such as 30w or 40w is basically the exact same thing as gl 1 gear oil. They are both base oil stock. The difference is with engine oil you have choices on viscosity...

Someone needs to introduce him to billw. That is a perfect deuce if there ever was one. I'm sure the money and man hours reflect that. I hope to see that marvel of a truck in person one day.

The head gaskets are known to seep oil. It may not be as bad as you are thinking. Any coolant in your engine oil or oil in your cooling system? If not you might try retorquing the head nuts. Worth a shot. I put 40 wt motor oil in my transmission. Seemed to help a little. Your results may...

There is nothing missing on the drivers side of the firewall that I can tell. The j shaped pipe by the air cleaner is the air vent tube for the air pak. It's supposed to dead end into the bobble head vent cap on the end of it. The seepage down the engine is possibly the head gasket? Hard to...