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Transmissions seem to have been Porsche's weak spot for decades. I know the Porsche syncros in my 519 could not put up with a quick shift even when new. The 741s had stronger syncrhos, but they were still Porsche-type. I've never had a 915, but the G-50 in my 911 still feels fragile even with the Borg-Warner synchros. I've never had recurring problems with a transmission in an American car or truck.