With no resistance manual transmissions will spin slowly in neutral, just from the fluid pushing on the gear teeth. Even in neutral the input and main shaft is still spinning.
So yea completely normal. If you would have looked in the tail shaft you probably would have seen the splines turning, so it was actually probably turning 10mph.
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1980 Formula
1980 Indy Pace T/A
Tech and Services at Deatschwerks
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