Certified PowerTrain (CPT) is a full service Manufacturing and Engineering provider of power train assemblies and components based in Elkhorn, WI. CPT machining capabilities include milling, hobbing, broaching and turning capabilities. CPT Core Product Offering • Flanges • Yokes • Drive Shafts • U-Joints • Axle Shafts/Spindles • Steering Shafts • Complete Drivetrain Assemblies • Transmission Components