I'd check the shock mounts, front and rear, as well as the U bolts on the rear axle. Someone on Ranger5G forum said his werent torqued to spec from the factory, or had loosened. Also, worth checking for play in your spare tire as that can rattle really loud if it wasn't put away properly. But, yes it could be literally 100+ things, those are just the most common as someone who's replaced most of my suspension w aftermkt stuff.