This is the 1-piece shaft for the 2003-04 Mustang Cobra with T56 trans. This driveshaft is made from 3-1/2 Aluminum with solid u-joints and is designed to be used with a 1350 rear pinion yoke. The weakest link on the ford drive shaft is the rear flat u-joint flange. By replacing this flange with a billet pinion yoke.