TD Motion offers 427W Crate Sniper EFI Engine With 4R70W Automatic Transmission for Hot Rod and Mustang. Complete engine with transmission easy fit. The 427w / 540 HP Crate Engine W/ 4 speed 4R70W Stage 3 Automatic Transmission is a great upgrade for the early 351w Ford Mustangs or FFR Project . The overdrive gear reduces the RPMs considerably from an early C4 . More torque than the 408w. Brand New Heavy Duty 4 Bolt Main Dart Block, not a “Performance Equivalent” or Chinese aftermarket block. Forged Steel Crank, Steel Beam Rods, Roller Camshaft, Roller Valvetrain. Aluminum Cylinder Heads Flow exceptionally better than the old Iron Heads. Classic Thump Idle sound. Includes Sniper EFI. Pump Gas Friendly Pump Gas Friendly – 91 octane and up.