QUOTE (blkirk @ Oct 1 2009, 03:38)

Getting back to classic short-cuts, I just recalled a story from a buddy of mine. He was on a road-trip in Mexico when the diff went out on his 1982 Chevy 1-ton van. (at only 320k miles or so, too.) The mechanic drained the oil from the diff housing and then put it in a zip-loc bag for safekeeping. When the repair was done, he tossed the oil-filled zip-loc into the diff housing, slapped on the cover plate and buttoned it up. The gears make quick work of the plastic bag, and your diff has oil again without the hassle of trying to pour it back in.
Traction Motor gearcases (final drive on a locomotive) are typically lubricated with a semi-liquid grease which comes in a plastic "sausage". The idea is you throw the whole thing in - same principle as the Zip-Loc bag.