ok, look. I can only base it upon my experience. Ford accidentally put a T-45 in as a replacement for my first dead 3650. It took them six months to find a replacement. In that time I knew I had a tranny I could BEAT TO DEATH. I put maybe 100+ runs on that tranny running as hard as I could powershifting. It was good to the day Ford told me they got my 3650. It was the end of racing season and that 3650 died less than a month later street driving. I hate the 3650.