This Bronco comes equipped with 347 motor with 420 HP. "302 block" Aluminum Heads Edelbrock Performer RPM. 9 1/2 to 1 Compression ratio. Truck Avenger Carburetor Holley. NP435 4 speed transmission - Dana 300 transfer case - Dana 44 front axle with Posi-traction and 4:56 gear ratio - Detroit Locker 14 bolt rear axle with 4:56 gear ratio.