Tourings like my donor came with a 3.91 - other had lower ratios.
I'm using a larger rolling radius on my wheels so the 3.91 is not quite as aggressive as it is on E30 size tyres. I have a spare 3.91 open diff but it makes a noise too.
I've double checked the standard / sport gear box situation. As far as I can tell on E30 these both had a 1:1 4th gear and an overdrive 5th. Only gears 1, 2 & 3 are different.
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