Mine makes all kinds of weird noises at different times. I haven't driven it enough to pinpoint when they happen. I get the popping sound in the rear, a popping sound in the front. A sort of consistent whining noise, from the front driver side, very subtle, that comes and goes at the exact same time intervals at highway speed. like a weeeeoooooweeeeeeooooweeeeeeooooo.. Best i can duplicated it in text. My truck makes ALOT of noises over even slight bumps. Just don't have time, with work, to deal with any of it.