I would agree with PopTime, not all DIIIs are created equal. Some of the most academically rigorous schools in the country are D3s, and while the core course GPA and ACT requirements don't apply to them for initial athletic eligibility, admission could be a problem.
The GPA is calcluated in the "core" courses, not overall. For example, my son is in a special arts magnet program where he has taken advanced studies in art for four years...none of those classes count toward his "core" GPA for determining eligibility. The ACT is also done as a sum of all of the sections. While there is a sliding scale for D1 (the higher your ACT the lower the GPA can be and vice versa) there is no sliding scale for D2. Minimum Core GPA is 2.0 and sum ACT score is 68.
Hope this helps, good luck!