I'd remove the trans, it's not hard to do.
When adding oil use 10w30 motor oil, that's what came in it.
If removing the trans I'd change the oil. The manufacturer recommends 20w50 full synthetic. I've just used 10w30 myself but you do you.
As for refill quantity? I just fill them till they are about 1/2" below the full plug or just covering the magnet in the fill hole. It takes about 2 quarts. I've never bothered to measure how much comes out as it doesn't really matter.
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JD x475
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