average was around $100k for position coaches and a around $200-300k for Coordinators. Attached is a list of what assistants make around the country. Utah pays about 40% more than BYU, just going off comments. I'm just going off what others say, so if they are lying or misinformed then of course i would be wrong.
http://sports.usatoday.com/ncaa/salaries/football/assistant