Junkyard Build is a 3D car builder for learning how a vehicle is put together. Pick a body (a 1966-77 Ford Bronco, Toyota FJ40, 1967-72 Chevy C10, Datsun 240Z, AE86 Corolla or NA Miata), then choose a real engine, transmission, transfer case, axle and gears, differentials, suspension, tires and brakes. It shows each part in 3D, explains what it does, warns you when a swap won't fit or won't survive, and works out weight, 0-60, quarter mile, top speed, crawl ratio and rough cost. Then drive it on a test ground with a drag strip, dirt trails, a rock garden, a mud pit and jumps. It needs JavaScript and WebGL. About Junkyard Build.