The 2005 Pontiac GTO used a Tremec T56 six-speed manual transmission. There was no factory automatic option offered in the U.S. market for that year, making the manual the standard setup for most buyers.
Transmission specifics for the 2005 model
Here is a concise summary of the official transmission setup for the 2005 GTO to help buyers and enthusiasts verify the configuration.
- Tremec T56 six-speed manual transmission (standard in the U.S. 2005 GTO)
- No factory automatic option in the U.S. market for 2005 GTOs
In summary, for a 2005 GTO in the United States, expect a manual transmission with the Tremec T56. If you come across a car advertised as automatic, it is likely either a non-U.S. market variant or an aftermarket modification.
Notes on later years and market variations
GM did modify the powertrain in the 2006 update, switching to the 6.0-liter LS2 engine, while the manual six-speed transmission remained the primary gearbox for U.S. buyers. Official factory documentation continues to show no U.S.-market automatic option for the 2005 GTO. Export versions or aftermarket conversions may differ, but the standard U.S. configuration for 2005 is a Tremec T56 manual.
Summary
The 2005 GTO’s drivetrain in the United States centers on a Tremec T56 six-speed manual transmission, with no factory automatic option offered that year. The 2006 model year brought an engine update (LS2) but did not change the fact that the U.S.-market 2005 GTO was a manual-only configuration.
What kind of transmission is in the 2005 GTO?
4L65E 2005-2006 Pontiac GTO – Remanufactured 4-Speed Automatic Trans.
What are common problems with 2005 GTOS?
Top 2005 Pontiac GTO Problems
- Stalling or Low Engine Idle Speed Due to Dirty Throttle Body.
- Check Engine Light Due to Gas Cap or Catalytic Converter.
- Replace spark plugs every 100,000 miles.
- Check Engine Light Due to Restricted Secondary Air Injection Check Valves.
- Contamination of extended life coolant.
Did GTO have LS1?
2004 Pontiac GTO LS1 5.7L V8 Engine with 6 speed manual transmission.
What makes the 2005 GTO special?
With a resulting gain of 50 hp and 35 lb-ft of torque over '04, the '05 GTO completely overpowers every car in its class (100 horses and 80 lb-ft more than the Mustang GT.) That's also more power and torque than the BMW M3 and the Porsche 911 Carrera. And more torque than the Ferrari 360 Modena.