Dropping the subframe at the same time apparently makes it much easier as you then have easier access to line up and tighten the diff to subframe bolts. I haven't done the diff on an MC, but when replacing diff pinion seal on my E30 (which has basically the same backend as an MC), I found the diff/subframe bolts to be bloody awkward and a struggle. Diff itself was surprisingly lighter than expected (thank god). It was only afterwards that someone suggested dropping the whole subframe.
You need to drop it a bit to access the bolts but i'm not sure how much you mean by dropping it but I just undid the two subframe bolts and lowered it a few inches as I didn't want to disturb the brakelines, cables etc
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