He became the men's basketball coach in 1989, holding that position until 1996, while also resigning from his football duties.
He won the school's second ever Vanier Cup championship in 2005 against the Saskatchewan Huskies.
On November 1, 2012, it was announced that Jeffries was stepping down as manager of football operations and head coach.
[4] From 2013 to 2014, Jeffries served as the special teams coordinator of the McMaster Marauders.
[5] He was then hired by the Guelph Gryphons in 2016 as a defence and special teams coach and served in that capacity for two years.