You don't need to drain it, but it will leak out when you pull the driveshaft. Just let it drain into a container that will give you an idea of how much you need to add back in.
Of course if it's been more than 10,000 since your last ATF change, then there's no time like the present...
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Dave
- 03 Baja - 92 SVX - 86 Brat - 08 OB 3.0
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