So far the only "vacated" Big Ten Titles were on behalf of Minnesota in 1997 and OSU's share of titles in 2000 and 2002
factoid: The University of Chicago has 6 Big Ten titles, 3 times the number of Northwestern!
Michigan had all or part of six seasons vacated but had no titles in those years,
Minnesota had all or part of seven seasons vacated
Ohio State had all or part of four seasons vacated
Purdue vacated the 1996 season but didn't win the title
Oddly, Illinois never vacated any wins while openly playing fast and loose with the rules in the Henson era.