i just did the tranny and diff oils yesterday. i wasnt well prepared so i didnt order any washers, i sorta did the diff and gearbox as a 'might-aswell' while i was doing the engine oil.
my only input at this point is that because the o-rings are not a snug fit around the core of the plugs, each time you tighten them down there is a chance you wont tighten it down on the same indentation as the previous. so you might not get a good/perfect seal. for this reason, i overtightened all plugs about 1/16th of a turn more. if the o-ring was more of a snug fit then id say re-using is fine without hesitation
on a side note, the Dimple magnetic drain plug i put on the gearbox did catch quite a lot of black particles. the diff drain plug came out black as expected.
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