Last time I tried to break mine was at the dragstrip. 5000rpm launch with my 3600lb outback. Front wheels hoppin.
Shifting at 7200rpm I missed 4th and grabbed 2nd from 3rd. Needle physically hit the right side of the tach and paused for a sec or two before coming back down. I'm guessing almost 10,000rpm. Almost took out an engine instead of a tranny.
2005 Outback FMT