The 2008 GMC Acadia runs on a 6-speed automatic transmission (6T75) paired with its 3.6L V6 engine. Shared across several GM platforms, replacement units are widely available. Delayed engagement, rough shifting, and complete failure are the most common complaints. Replacement costs range from $600 to $1,000 for used units and $1,500 to $2,800 for remanufactured options. Always flush c... https://turboautoparts.com/used-transmission/gmc/acadia/2008