No! IU uses the highest GPA on the transcript. So if OP’s weighed GPA is on the transcript, IU is a safety and OP does NOT need to petition.
From the website:
- Earned a cumulative GPA of 3.8 on a 4.0 scale in high school. We will use the highest GPA that is sent to IU Admissions from your official high school transcript. In most cases this is the weighted GPA.