Is a 400 turbo the same size as a 700R4?

No, a Turbo 400 (TH400) and a 700R4 are not the same size. The Turbo 400 is a larger, heavier-duty three-speed automatic transmission, while the 700R4 is a lighter four-speed automatic transmission. They have different dimensions, weight, and gear ratiOS, which makes them suited for different applications in vehicles. Additionally, the mounting points and connection configurations differ between the two transmissions.