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 you will have a 1350 series u-joint going to the rear and will be able to handle upwards of 950HP.
This driveshaft is high speed balanced on one of the most sophisticated balancing machines in the industry.