I have a 94 Dodge Ram 1500 4wd, driving on the highway once in a while 45+ mph I can feel and hear a slight noise, when I slam on the brakes thinking it will stop the truck pulls hard right. After my 20 miles trip into town, back on the highway no noise slam on the brakes perfectly fine any thoughts

 

dragging caliper, collapsed brake hose (the rubber, won't let the caliper release) Check the brakes first (jack the right front up and see how easy it spins, if hard open the bleeder screw and see if it gets easier, if so it's the hose, if not probably caliper) see if anything wiggles while it's jacked up

 

I had taken the front tires off, the passenger side spins freely and so does the drivers side, I'm on the guess that the passenger side caliper is abit slow on the release

 

If they are the original calipers, they can and do go bad, and will stick open or closed. I had to have the calipers on my truck replaced a few months ago, they were original with 168000 miles on them and were worn out.