Once you get past 65 going east it is a pretty busy road. You will definitely have problems from the Porter/Lake county line as US 6 is under construction and is VERY narrow and just as busy. This lasts until just past Willowbrook road in Portage. After that it will be a pretty scenic trip (except for everyone driving by you at 60 when you get past route 49).
I drive this road pretty regularly and live in Chesterton. Also, Gary is not that scary as long as you stay on the main roads and it is daylight.
Brad