Jimmie Johnson opens up about his relationship with his former crew chief, Chad Knaus. Johnson explains the double-edged sword of their brutally honest communication, which he attributes to improving their performance on the track and helping the team win seven NASCAR Cup Series championships over the course of 17 seasons together. Later, he says it was that same brutal honesty that eventually eroded their professional relationship. Johnson also talks about going to therapy to help repair his relationship with Knaus and how those sessions still benefit him today.