The transmission maker supplying the Dark Horse six-speed manual in the seventh-generation Ford Mustang is Tremec.
The seventh-generation Mustang, known internally as the S650, debuted for the 2024 model year. At launch, Ford offered three transmission choices across the range: a Getrag six-speed manual for the GT, a Tremec six-speed manual for the Dark Horse, and a 10-speed automatic available across the lineup.
The Dark Horse uses the Tremec TR-3160, a transmission selected for its performance capability and durability. Its ratios differ from the GT’s Getrag MT82-D4, including a 3.25:1 first gear and a 3.73:1 final drive. That distinction matters because both gearboxes are six-speed manuals, but they are not the same unit.
A common mix-up is answering Getrag, since the GT also has a manual gearbox. The question specifically names the Dark Horse, making Tremec the single canonical answer.