Munchak interviewed in Pittsburgh last Friday and his history makes him the ideal choice to mold a young offensive line that returns every starter next season and should also get Pro Bowl center Maurkice Pouncey back from a major knee injury.
Munchak, one of the greatest guards in NFL history, is in the Pro Football of Fame, and he also distinguished himself coaching the offensive lines in Houston and Tennessee.
Munchak rose to head coach in Tennessee but he was fired earlier this month after the Titans went 7-9 and he refused to make sweeping changes to his staff.
Munchak has extensive experience teaching the outside zone blocking scheme that would appear to be an ideal fit for rookie running back Le'Veon Bell. The Steelers installed the scheme last year but ditched it following the torn knee that Pouncey sustained eight snaps into the Steelers' season opener.
Munchak has Pennsylvania roots as he is a Scranton native who starred at Penn State in the late 1970s and early 1980s.
He becomes the third assistant on Tomlin's staff who was previously a head coach joining defensive coordinator Dick LeBeau and offensive coordinator Todd Haley in that distinction.
Munchak takes over for Jack Bicknell Jr., whom Tomlin fired after just one season.