The 2006 Pontiac GTO uses a six-speed manual Tremec transmission; there was no factory automatic option for this model year in the United States. The car’s performance focus and Holden-derived lineage meant the manual gearbox was the standard setup.
Background: The GTO’s drivetrain in context
The 2006 GTO is the North American version of the Holden Monaro, built in Australia with a 5.7-liter V8 (the LS1). For the U.S. market, Pontiac emphasized a traditional sports-car experience, which centered on a manual transmission rather than an automatic option in that year.
Transmission details
The GTO’s gearbox is a Tremec six-speed manual, commonly referred to as the T56 in this application. Across the 2004–2006 run in the United States, there was no factory automatic transmission offered for the GTO, making the manual the sole transmission choice for that year. Some enthusiasts pursued aftermarket automatic conversions, but these were not part of the factory lineup.
Notes on other markets and variations
In other markets where the vehicle shared heritage with the Holden/Monaro line, different configurations existed, but for the U.S. 2006 GTO, the six-speed manual Tremec transmission was standard and effectively exclusive.
Summary
In short, the 2006 Pontiac GTO is equipped with a six-speed manual Tremec transmission, with no factory automatic option offered in that year for the U.S. market. This aligns with the model’s performance-centric positioning and Holden-derived engineering.