The replacement 429ci V8 was sourced from a 1970 Mustang Boss 429;Rust repair was performed and new sheet metal was added to the inner fenders;Power is sent to the rear wheels via a four-speed manual transmission, a balanced driveshaft unique to the Boss 429, a 9″ rear end, and a Traction-Lok limited-slip differential with a 3.91:1 final drive.The five-digit odometer shows over 12k miles, TMU.