I have the Borg Warner 11 ( T39 ) 3 speed auto. No real issues with the trans except that the vacuum modulators are no longer available. Philbin Group in Oregon can rebuild them. My concern/idea is that the 727 has a much greater parts availability and build options specific to racing,towing etc. By the way, I'll be towing. I'm wondering how involved the swap would be ? I did a search and did not find any info. Has anyone done this swap ?