The grad schools know who is who and their academic strength no matter how small or large, well known name or obscure unknown. All you have to know is, how many of their pre meds, pre laws or whatever you plan to be, get in their first choice med or law school etc. What the average incoming SAT or ACT score is useful information as well. You can find a school of any D rating or size to fit your academic needs.
My daughter tells me that in her in-person interview for grad school the interviewer was very impressed with the fact that she was a D1 athlete. He didn't know that LMU was D1 and he asked her what division they played he perked up immediately when she said it was D1. He spent some time during the interview asking her about playing ball, including how much time spent on softball. Playing 65 games during the season and keeping up good grades made an impression.
So, with some grad schools, you get some extra brownie points for playing a D1 sport. The interview can have more to do with whether you get accepted than your GPA.