2000 3.4 cooling system

hey guys, got a question i hope someone can help with!
so i cracked a head on my 3.4, engine was rebuilt before i bought it, an 20k later i cracked a head, bought a new one, replaced both head gaskets, truck runs good. but something with the cooling system seems off. the top radiator hose gets really hot, while the bottom hose seems to stay cool, the temp gage stays normal but something doesn't seem right. i replaced the t-stat, no change, it seems like there is no flow of coolant. radiator is clean and has flow, but i don't think there is a flow from top to bottom threw the engine. does this sound normal? and i triple checked i put the head gaskets on right, learned my lesson on my 94 had them flip flopped and it ended up getting hot and rounding out the cam lobes, idk if I'm being paranoid but, i am kinda thinking i have the same issue. please i would like to here any input you may have thanks guys!!!