if the whine was fixed right after it showed up then chances are you can live with that final drive. But if the final drive has lots of miles made after it started whining, then it is most probably worn and can not be considered as a reliable unit. Although there're lots of whining final drives on the roads, I wouldn't trust one if I were after a heavy-duty (or a performance as you say) transmission.
The play and backlash specs can be found in the manual (which, as far as I see it, you've got in some PDF version). But you need to look for pitting and wear on the gears rather than just performing measurements with a dial gauge.
Have my word, do a search for gearbox posts by CMyles and contact him with whatever means possible. He is one of the best C900 transmission gurus and the only one of them being a native english-speaker.
posted by 83.149.8...
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