Cognito confirms that this kit will work on a 2015. 4" STAGE 2 Cognito lift kit package for 2011-2015 4WD Ford F250. Lifts front 4" and rear 3.5". Uses new front progressive rate 4" lift coil springs, radius arm drop bracket, new track bar bracket, drop pitman arm, front and rear FOX Performance Series Monotube shocks. It is recommened not to combine other lifting components with this lift kit since each part is designed to work together. Poor driveability and/or damage may occur.
This is taken directly from the installation instructions:
Working on only one side at a time, support the axle housing on the driver side, then remove the driver side u-bolts and block. Lower the axle a few inches and install the new block which will have a D or DR marking for Driver. Install the new longer u-bolts and use anti seize on the threads before tightening them up. The block is tapered and will be slightly shorter in the front than the rear.
Installation Instructions - Click Here --> http://www.cognitomotorsports.com/med...