Auto part stores sell an "extension hose" to fill diff oil.
It only cost $3-4. It will make the refilling a lot easier. Room to manuever the bottle is VERY limited up there.
There is also a vent located high behind the differential (at least in my car), it looks like a bolt with a "top." Remove it, if you can, clean the screen and re-install.
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J.H.
'86 300E
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