Advance Adapters has been engineering drivetrain conversion components in Paso Robles, California since 1971. The company is best known for the Atlas transfer case, along with a full line of transmission adapters, transfer case adapters, and bellhousing kits built for Jeep, Toyota, and other 4x4 platforms. Everything is designed and manufactured in the USA for off-road builds, rock crawlers, and custom drivetrain swaps.