IU does consider class rank. At one time, based on the Common Data set reporting at that time, it was as important as GPA. With a 3.0, I think your chances of admission are low. Less than 12% of freshman have a GPA in that range. This is the freshman class profile for 2014: http://admissions.indiana.edu/education/class-profile.html
The Common Data set can be found here: https://www.iu.edu/~uirr/reports/compliance/cds/2014/IUBLA/C