You really need a temp gun. I tend to not worry below 200. Usually the ones I see as an issue hit 300 in a short distance. Yours could be as simple as needing a break-in.
Take it on short drive, put it in neutral at about 2 mph on flat ground. If you can't feel it when it stops rolling, no problem with drag. If you can actually "feel" the stop, you have some drag that needs to be checked.