I like the straw idea. I used my little finger - had it handy. :-) I might have over-filled it a tad (probably top of original fill hole). I figured more was better than not enough. :-) BTW, I used around 2 2/3 qt to 2 3/4 qt for the rear diff. I expect the front one will be the same - I'm saving it for next week-end.

Here's a picture of the finished rear diff:



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