VT and Stevens have career surveys. The pay levels found by recent graduates in mechanical engineering are not much different (beware of the difference between median and average pay, though).
VT: http://www.career.vt.edu/postgraduationsurveyreport/postgrad.html#report
Stevens: http://www.stevens.edu/sit/sites/sit/files/Class%20of%202013%20Outcome%20Report_Final_0.pdf and http://www.stevens.edu/sit/ocd/students/employment/salarysurvey.cfm
Couldn’t find any such thing for IIT. Maybe @xraymancs can provide a link?