[madcorgi]

Originally Posted by pavulon

Issue solved:

"Also, like the Bullitt, the Mach 1's standard transmission is a six-speed manual, though this one's the Tremec 3160 borrowed from the GT350—not the GT's allegedly fragile Getrag MT-82. That's great news. "

https://www.thedrive.com/news/34075/2021-ford-mustang-mach-1-a-more-track-ready-bullitt-with-ample-shelby-parts