When I did mine, I bought a new Phaser,chain lower sprocket, and tensioners, and gasket kit.......afterwards I found out I didn't need all those extras ..it is as simple as pull cam out replace cam, with the new chain I just lined up the marks, put it all back together , truck took 3 starts to idle, and honestly I was a sh!tIng bricks really thought I'd F'd up the whole thing, but on that 3rd start it idled , and WOOOOOOOOW WHOOOO the fun begain